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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title><![CDATA[NSHint]]></title>
<link href="http://nshint.io/atom.xml" rel="self"/>
<link href="http://nshint.io/"/>
<updated>2015-07-23T08:33:58+02:00</updated>
<id>http://nshint.io/</id>
<author>
<name><![CDATA[NSHint]]></name>
</author>
<generator uri="http://octopress.org/">Octopress</generator>
<entry>
<title type="html"><![CDATA[UICollectionViews now have easy reordering]]></title>
<link href="http://nshint.io/blog/2015/07/16/uicollectionviews-now-have-easy-reordering/"/>
<updated>2015-07-16T01:30:09+02:00</updated>
<id>http://nshint.io/blog/2015/07/16/uicollectionviews-now-have-easy-reordering</id>
<content type="html"><![CDATA[<p>I’m a huge fan of <code>UICollectionView</code>. It’s way more customizable than his older brother <code>UITableView</code>. Nowadays I use collection view even more often than table view. With iOS 9 it supports easy reordering. Before it wasn’t possible out of the box, and to do so means painful work. Let’s have look at the API. You can find the accompanying Xcode project <a href="https://github.com/nshintio/uicollectionview-reordering">on GitHub</a>.</p>
<p>The easiest way to add easy reordering is to use <code>UICollectionViewController</code>. It now has a new property called <code>installsStandardGestureForInteractiveMovement</code> which adds standard gestures to reorder cells. This property is <code>true</code> by default, which means that there’s only one method we should to override to get things working.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="kr">override</span> <span class="k">func</span> <span class="nf">collectionView</span><span class="p">(</span><span class="nl">collectionView</span><span class="p">:</span> <span class="bp">UICollectionView</span><span class="p">,</span>
</span><span class='line'> <span class="n">moveItemAtIndexPath</span> <span class="nl">sourceIndexPath</span><span class="p">:</span> <span class="bp">NSIndexPath</span><span class="p">,</span>
</span><span class='line'> <span class="n">toIndexPath</span> <span class="nl">destinationIndexPath</span><span class="p">:</span> <span class="bp">NSIndexPath</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'> <span class="c1">// move your data order</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>The collection view infers that items can be moved because <code>moveItemAtIndexPath</code> is overrired.</p>
<p><img class="center" src="http://nshint.io/images/uicollectionview-reordering/1.gif"></p>
<p>Things go complicated when we want to use a simple <code>UIViewController</code> with collection view. We also need to implement <code>UICollectionViewDataSource</code> methods mentioned above, but we need to rewrite <code>installsStandardGestureForInteractiveMovement</code>. No worries, it’s also easily supported.<code>UILongPressGestureRecognizer</code> is a continuous gesture recognizer and fully supports panning.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="kr">override</span> <span class="k">func</span> <span class="nf">viewDidLoad</span><span class="p">()</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">super</span><span class="p">.</span><span class="n">viewDidLoad</span><span class="p">()</span>
</span><span class='line'>
</span><span class='line'> <span class="n">longPressGesture</span> <span class="o">=</span> <span class="bp">UILongPressGestureRecognizer</span><span class="p">(</span><span class="nl">target</span><span class="p">:</span> <span class="nb">self</span><span class="p">,</span> <span class="nl">action</span><span class="p">:</span> <span class="s">"handleLongGesture:"</span><span class="p">)</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">collectionView</span><span class="p">.</span><span class="n">addGestureRecognizer</span><span class="p">(</span><span class="n">longPressGesture</span><span class="p">)</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="k">func</span> <span class="nf">handleLongGesture</span><span class="p">(</span><span class="nl">gesture</span><span class="p">:</span> <span class="bp">UILongPressGestureRecognizer</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">switch</span><span class="p">(</span><span class="n">gesture</span><span class="p">.</span><span class="n">state</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">case</span> <span class="n">UIGestureRecognizerState</span><span class="p">.</span><span class="nl">Began</span><span class="p">:</span>
</span><span class='line'> <span class="n">guard</span> <span class="k">let</span> <span class="n">selectedIndexPath</span> <span class="o">=</span> <span class="nb">self</span><span class="p">.</span><span class="n">collectionView</span><span class="p">.</span><span class="n">indexPathForItemAtPoint</span><span class="p">(</span><span class="n">gesture</span><span class="p">.</span><span class="n">locationInView</span><span class="p">(</span><span class="nb">self</span><span class="p">.</span><span class="n">collectionView</span><span class="p">))</span> <span class="k">else</span> <span class="p">{</span>
</span><span class='line'> <span class="k">break</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="n">collectionView</span><span class="p">.</span><span class="n">beginInteractiveMovementForItemAtIndexPath</span><span class="p">(</span><span class="n">selectedIndexPath</span><span class="p">)</span>
</span><span class='line'> <span class="k">case</span> <span class="n">UIGestureRecognizerState</span><span class="p">.</span><span class="nl">Changed</span><span class="p">:</span>
</span><span class='line'> <span class="n">collectionView</span><span class="p">.</span><span class="n">updateInteractiveMovementTargetPosition</span><span class="p">(</span><span class="n">gesture</span><span class="p">.</span><span class="n">locationInView</span><span class="p">(</span><span class="n">gesture</span><span class="p">.</span><span class="n">view</span><span class="o">!</span><span class="p">))</span>
</span><span class='line'> <span class="k">case</span> <span class="n">UIGestureRecognizerState</span><span class="p">.</span><span class="nl">Ended</span><span class="p">:</span>
</span><span class='line'> <span class="n">collectionView</span><span class="p">.</span><span class="n">endInteractiveMovement</span><span class="p">()</span>
</span><span class='line'> <span class="k">default</span><span class="o">:</span>
</span><span class='line'> <span class="n">collectionView</span><span class="p">.</span><span class="n">cancelInteractiveMovement</span><span class="p">()</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>We stored selected index path obtained in long press gesture handler and depending on wether it has any value we allow to pan gesture to kick in. Then, we call some new collection view methods accordingly to the gesture state:</p>
<ul>
<li><code>beginInteractiveMovementForItemAtIndexPath(indexPath: NSIndexPath)</code> which starts interactive movement for cell at specific index path</li>
<li><code>updateInteractiveMovementTargetPosition(targetPosition: CGPoint)</code> which updates interactive movement target position during gesture</li>
<li><code>endInteractiveMovement()</code> which ends interactive movement after you finish pan gesture</li>
<li><code>cancelInteractiveMovement()</code> which cancels interactive movement</li>
</ul>
<p>And this makes handling pan gesture obvious.</p>
<p><img class="center" src="http://nshint.io/images/uicollectionview-reordering/2.gif"></p>
<p>The behavior is the same as with standard <code>UICollectionViewController</code>. Really cool, but what makes it even cooler is that we can apply reordering to collection view with our custom collection view layout. Check interactive movement with simple waterfall layout.</p>
<p><img class="center" src="http://nshint.io/images/uicollectionview-reordering/3.gif"></p>
<p>Uhm, looks cool, but what if we don’t want to change cell size during movement? Selected cell size during interactive movement should remain the same. This is possible. <code>UICollectionViewLayout</code> also gets additional methods to handle reordering.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="k">func</span> <span class="n">invalidationContextForInteractivelyMovingItems</span><span class="p">(</span><span class="nl">targetIndexPaths</span><span class="p">:</span> <span class="p">[</span><span class="bp">NSIndexPath</span><span class="p">],</span>
</span><span class='line'> <span class="n">withTargetPosition</span> <span class="nl">targetPosition</span><span class="p">:</span> <span class="bp">CGPoint</span><span class="p">,</span>
</span><span class='line'> <span class="nl">previousIndexPaths</span><span class="p">:</span> <span class="p">[</span><span class="bp">NSIndexPath</span><span class="p">],</span>
</span><span class='line'> <span class="nl">previousPosition</span><span class="p">:</span> <span class="bp">CGPoint</span><span class="p">)</span> <span class="o">-></span> <span class="bp">UICollectionViewLayoutInvalidationContext</span>
</span><span class='line'>
</span><span class='line'><span class="k">func</span> <span class="n">invalidationContextForEndingInteractiveMovementOfItemsToFinalIndexPaths</span><span class="p">(</span><span class="nl">indexPaths</span><span class="p">:</span> <span class="p">[</span><span class="bp">NSIndexPath</span><span class="p">],</span>
</span><span class='line'> <span class="nl">previousIndexPaths</span><span class="p">:</span> <span class="p">[</span><span class="bp">NSIndexPath</span><span class="p">],</span>
</span><span class='line'> <span class="nl">movementCancelled</span><span class="p">:</span> <span class="n">Bool</span><span class="p">)</span> <span class="o">-></span> <span class="bp">UICollectionViewLayoutInvalidationContext</span>
</span></code></pre></td></tr></table></div></figure>
<p>The former is called during the cells interactive movement with target and previous cell’s indexPaths. The next one is similar, but it’s called just after interactive movement ends. With this knowledge we can achieve our requirement using one little trick.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="n">internal</span> <span class="kr">override</span> <span class="k">func</span> <span class="n">invalidationContextForInteractivelyMovingItems</span><span class="p">(</span><span class="nl">targetIndexPaths</span><span class="p">:</span> <span class="p">[</span><span class="bp">NSIndexPath</span><span class="p">],</span>
</span><span class='line'> <span class="n">withTargetPosition</span> <span class="nl">targetPosition</span><span class="p">:</span> <span class="bp">CGPoint</span><span class="p">,</span>
</span><span class='line'> <span class="nl">previousIndexPaths</span><span class="p">:</span> <span class="p">[</span><span class="bp">NSIndexPath</span><span class="p">],</span>
</span><span class='line'> <span class="nl">previousPosition</span><span class="p">:</span> <span class="bp">CGPoint</span><span class="p">)</span> <span class="o">-></span> <span class="bp">UICollectionViewLayoutInvalidationContext</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">var</span> <span class="n">context</span> <span class="o">=</span> <span class="nb">super</span><span class="p">.</span><span class="n">invalidationContextForInteractivelyMovingItems</span><span class="p">(</span><span class="n">targetIndexPaths</span><span class="p">,</span>
</span><span class='line'> <span class="nl">withTargetPosition</span><span class="p">:</span> <span class="n">targetPosition</span><span class="p">,</span> <span class="nl">previousIndexPaths</span><span class="p">:</span> <span class="n">previousIndexPaths</span><span class="p">,</span>
</span><span class='line'> <span class="nl">previousPosition</span><span class="p">:</span> <span class="n">previousPosition</span><span class="p">)</span>
</span><span class='line'>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">delegate</span><span class="o">?</span><span class="p">.</span><span class="n">collectionView</span><span class="o">!</span><span class="p">(</span><span class="nb">self</span><span class="p">.</span><span class="n">collectionView</span><span class="o">!</span><span class="p">,</span> <span class="nl">moveItemAtIndexPath</span><span class="p">:</span> <span class="n">previousIndexPaths</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span>
</span><span class='line'> <span class="nl">toIndexPath</span><span class="p">:</span> <span class="n">targetIndexPaths</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
</span><span class='line'>
</span><span class='line'> <span class="k">return</span> <span class="n">context</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>Solution is straightforward. Grab previous and target index paths of currently moving cell. Then call <code>UICollectionViewDataSource</code> method to move this items around.</p>
<p><img class="center" src="http://nshint.io/images/uicollectionview-reordering/4.gif"></p>
<p>Without a doubt, a collection view reordering is a fantastic addition. UIKit engineers made awesome job! :)</p>
<p>P.S: I would like to thanks <a href="https://twitter.com/qdoug">Douglas Hill</a> for hinting out some improvements in our code. Thanks Douglas, keep up the good work!</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Shared breakpoints]]></title>
<link href="http://nshint.io/blog/2015/07/12/shared-breakpoints/"/>
<updated>2015-07-12T19:00:40+02:00</updated>
<id>http://nshint.io/blog/2015/07/12/shared-breakpoints</id>
<content type="html"><![CDATA[<p>Developing multithreaded application is not something new and it’s become more and more popular with multicore processors. One thing it’s for sure, debugging multithread applications is tough.</p>
<p>iOS has some gotchas regarding multithread, things that if you don’t respect, may cause your application to crash or hang the users interface, for example:</p>
<ul>
<li>Animations outside the main thread, may crash the application.<br/></li>
<li>Performing network requests on the main thread, will hang the users interface.<br/></li>
</ul>
<p><img class="left" src="http://nshint.io/images/shared-breakpoints/1.png">
We can solve those situations by using the so called <code>Symbolic Breakpoints</code> and <a href="https://developer.apple.com/library/ios/recipes/xcode_help-breakpoint_navigator/articles/sharing_a_breakpoint.html">share those breakpoints</a> with your team. Thereby, every developer can take advantage of that, and get notified, when they occur.</p>
<p>To help you out, we created a bunch of shared breakpoints and integrate them into your project is very easy:</p>
<p><img class="right" src="http://nshint.io/images/shared-breakpoints/2.png">
- Go to your <code>.xcodeproj</code> or <code>.xcworkspace</code> file, right click on it, and choose <code>Show Package Contents</code>.<br/>
- Open the folder <code>xcshareddata</code>, then <code>xcdebugger</code> (create them if not exists).<br/>
- Breakpoints are saved into <code>Breakpoints_v2.xcbkptlist</code>.<br/>
- Now you just have to paste the following content into the <code><Breakpoints></code> node.</p>
<p>(We could also add those by using <a href="https://developer.apple.com/library/mac/documentation/IDEs/Conceptual/gdb_to_lldb_transition_guide/document/lldb-terminal-workflow-tutorial.html"><code>LLDB</code> commands</a>, but those won’t show up on the Breakpoints navigator)</p>
<p><img class="center" src="http://nshint.io/images/shared-breakpoints/3.png"></p>
<p>Our list of useful breakpoints <a href="https://gist.github.com/rakaramos/d2bc8e75ae68ac830a59">is available here</a></p>
<p>Now, whenever the breakpoint conditions are satisfied, you’ll be notified and will have a chance to quickly fix your code, before it crashes into the users hand!</p>
<p><img class="center" src="http://nshint.io/images/shared-breakpoints/4.png"></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Working with Core Telephony framework]]></title>
<link href="http://nshint.io/blog/2015/07/05/working-with-coretelephony-framework/"/>
<updated>2015-07-05T15:52:09+02:00</updated>
<id>http://nshint.io/blog/2015/07/05/working-with-coretelephony-framework</id>
<content type="html"><![CDATA[<p>Have you ever encountered a situation where you want to build some record or music app ? But you need to somehow react on a phone call which in many cases break recording or playing in more advanced app (mostly when it comes to <code>CoreAudio</code>) or switch UI in case of call? <code>CoreTelephony</code> is a great library which will help in most of the situations.</p>
<p>To detect phone call on your iPhone or iPad app (this may be the case now when we use continuity) simply use this piece of code:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class='objc'><span class='line'><span class="cp">#import <CoreTelephony/CTCall.h></span>
</span><span class='line'><span class="cp">#import <CoreTelephony/CTCallCenter.h></span>
</span><span class='line'><span class="cp">#import <CoreTelephony/CTCarrier.h></span>
</span><span class='line'><span class="cp">#import <CoreTelephony/CTTelephonyNetworkInfo.h></span>
</span><span class='line'>
</span><span class='line'><span class="k">@interface</span> <span class="nc">MMCallNotificationManager</span><span class="p">()</span>
</span><span class='line'><span class="k">@property</span> <span class="p">(</span><span class="k">nonatomic</span><span class="p">,</span> <span class="k">strong</span><span class="p">)</span> <span class="bp">CTCallCenter</span> <span class="o">*</span><span class="n">callCenter</span><span class="p">;</span>
</span><span class='line'><span class="k">@property</span> <span class="p">(</span><span class="k">nonatomic</span><span class="p">)</span> <span class="kt">BOOL</span> <span class="n">callWasStarted</span><span class="p">;</span>
</span><span class='line'><span class="k">@end</span>
</span><span class='line'>
</span><span class='line'><span class="k">@implementation</span> <span class="nc">MMCallNotificationManager</span>
</span><span class='line'>
</span><span class='line'><span class="p">-</span> <span class="p">(</span><span class="kt">instancetype</span><span class="p">)</span><span class="nf">init</span>
</span><span class='line'><span class="p">{</span>
</span><span class='line'> <span class="nb">self</span> <span class="o">=</span> <span class="p">[</span><span class="nb">super</span> <span class="n">init</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'> <span class="k">if</span> <span class="p">(</span><span class="nb">self</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">callCenter</span> <span class="o">=</span> <span class="p">[[</span><span class="bp">CTCallCenter</span> <span class="n">alloc</span><span class="p">]</span> <span class="n">init</span><span class="p">];</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">callWasStarted</span> <span class="o">=</span> <span class="nb">NO</span><span class="p">;</span>
</span><span class='line'>
</span><span class='line'> <span class="k">__weak</span> <span class="n">__typeof__</span><span class="p">(</span><span class="nb">self</span><span class="p">)</span> <span class="n">weakSelf</span> <span class="o">=</span> <span class="nb">self</span><span class="p">;</span>
</span><span class='line'>
</span><span class='line'> <span class="p">[</span><span class="nb">self</span><span class="p">.</span><span class="n">callCenter</span> <span class="nl">setCallEventHandler</span><span class="p">:</span><span class="o">^</span><span class="p">(</span><span class="bp">CTCall</span> <span class="o">*</span><span class="n">call</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">if</span> <span class="p">([[</span><span class="n">call</span> <span class="n">callState</span><span class="p">]</span> <span class="nl">isEqual</span><span class="p">:</span><span class="n">CTCallStateIncoming</span><span class="p">]</span> <span class="o">||</span>
</span><span class='line'> <span class="p">[[</span><span class="n">call</span> <span class="n">callState</span><span class="p">]</span> <span class="nl">isEqual</span><span class="p">:</span><span class="n">CTCallStateDialing</span><span class="p">])</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">if</span> <span class="p">(</span><span class="n">weakSelf</span><span class="p">.</span><span class="n">callWasStarted</span> <span class="o">==</span> <span class="nb">NO</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="n">weakSelf</span><span class="p">.</span><span class="n">callWasStarted</span> <span class="o">=</span> <span class="nb">YES</span><span class="p">;</span>
</span><span class='line'>
</span><span class='line'> <span class="n">NSLog</span><span class="p">(</span><span class="s">@"Call was started."</span><span class="p">);</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">([[</span><span class="n">call</span> <span class="n">callState</span><span class="p">]</span> <span class="nl">isEqual</span><span class="p">:</span><span class="n">CTCallStateDisconnected</span><span class="p">])</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">if</span> <span class="p">(</span><span class="n">weakSelf</span><span class="p">.</span><span class="n">callWasStarted</span> <span class="o">==</span> <span class="nb">YES</span><span class="p">)</span>
</span><span class='line'> <span class="p">{</span>
</span><span class='line'> <span class="n">weakSelf</span><span class="p">.</span><span class="n">callWasStarted</span> <span class="o">=</span> <span class="nb">NO</span><span class="p">;</span>
</span><span class='line'>
</span><span class='line'> <span class="n">NSLog</span><span class="p">(</span><span class="s">@"Call was ended."</span><span class="p">);</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}];</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="k">return</span> <span class="nb">self</span><span class="p">;</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">@end</span>
</span></code></pre></td></tr></table></div></figure>
<p>Another example of usage may be detecting if we have simcard installed on our device. For example our application allows user to call someone within the app, but we want to inform if the card is removed. Of course we can use some iOS urls for that, such as: <code>telprompt:</code> but they likely breaks UI e.g: in iOS8 it blinks twice which is not a nice effect…</p>
<p>So to detect if simcard is in place, use this code:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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<span class='line-number'>31</span>
</pre></td><td class='code'><pre><code class='objc'><span class='line'><span class="cp">#import <CoreTelephony/CTTelephonyNetworkInfo.h></span>
</span><span class='line'><span class="cp">#import <CoreTelephony/CTCarrier.h></span>
</span><span class='line'>
</span><span class='line'><span class="p">-</span> <span class="p">(</span><span class="kt">IBAction</span><span class="p">)</span><span class="nf">handleCallButtonPress:</span><span class="p">(</span><span class="kt">id</span><span class="p">)</span><span class="nv">sender</span>
</span><span class='line'><span class="p">{</span>
</span><span class='line'> <span class="bp">CTTelephonyNetworkInfo</span> <span class="o">*</span><span class="n">networkInfo</span> <span class="o">=</span> <span class="p">[[</span><span class="bp">CTTelephonyNetworkInfo</span> <span class="n">alloc</span><span class="p">]</span> <span class="n">init</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'> <span class="bp">NSString</span> <span class="o">*</span><span class="n">code</span> <span class="o">=</span> <span class="p">[</span><span class="n">networkInfo</span><span class="p">.</span><span class="n">subscriberCellularProvider</span> <span class="n">mobileCountryCode</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'> <span class="c1">//this is nil if you take out sim card.</span>
</span><span class='line'> <span class="k">if</span> <span class="p">(</span><span class="n">code</span> <span class="o">==</span> <span class="nb">nil</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="bp">UIAlertView</span> <span class="o">*</span><span class="n">alertView</span> <span class="o">=</span> <span class="p">[[</span><span class="bp">UIAlertView</span> <span class="n">alloc</span><span class="p">]</span> <span class="nl">initWithTitle</span><span class="p">:</span><span class="n">NSLocalizedString</span><span class="p">(</span><span class="s">@"aler.error"</span><span class="p">,</span><span class="nb">nil</span><span class="p">)</span>
</span><span class='line'> <span class="nl">message</span><span class="p">:</span><span class="n">NSLocalizedString</span><span class="p">(</span><span class="s">@"alert.message.no_sim_card"</span><span class="p">,</span><span class="nb">nil</span><span class="p">)</span>
</span><span class='line'> <span class="nl">delegate</span><span class="p">:</span><span class="nb">nil</span>
</span><span class='line'> <span class="nl">cancelButtonTitle</span><span class="p">:</span><span class="n">NSLocalizedString</span><span class="p">(</span><span class="s">@"alert.button_dimiss"</span><span class="p">,</span> <span class="nb">nil</span><span class="p">)</span>
</span><span class='line'> <span class="nl">otherButtonTitles</span><span class="p">:</span><span class="nb">nil</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'> <span class="p">[</span><span class="n">alertView</span> <span class="n">show</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'> <span class="k">return</span><span class="p">;</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="c1">//make regular phone prompt (with call confirmation)</span>
</span><span class='line'> <span class="bp">NSURL</span> <span class="o">*</span><span class="n">phoneUrl</span> <span class="o">=</span> <span class="p">[</span><span class="bp">NSURL</span> <span class="nl">URLWithString</span><span class="p">:[</span><span class="bp">NSString</span> <span class="nl">stringWithFormat</span><span class="p">:</span><span class="s">@"telprompt://%@"</span><span class="p">,</span><span class="n">phoneNumberString</span><span class="p">]];</span>
</span><span class='line'>
</span><span class='line'> <span class="k">if</span> <span class="p">([[</span><span class="bp">UIApplication</span> <span class="n">sharedApplication</span><span class="p">]</span> <span class="nl">canOpenURL</span><span class="p">:</span><span class="n">phoneUrl</span><span class="p">])</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">[[</span><span class="bp">UIApplication</span> <span class="n">sharedApplication</span><span class="p">]</span> <span class="nl">openURL</span><span class="p">:</span><span class="n">phoneUrl</span><span class="p">];</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>I hope this will help you reduce potential edge cases in your future apps.</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[How to animate UILabel properties]]></title>
<link href="http://nshint.io/blog/2015/07/04/how-to-animate-uilabel-properties/"/>
<updated>2015-07-04T15:53:09+02:00</updated>
<id>http://nshint.io/blog/2015/07/04/how-to-animate-uilabel-properties</id>
<content type="html"><![CDATA[<p><code>UILabel</code> properties cannot be easy animated due to some various reasons, so code like this will have no effect on it:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='objC'><span class='line'><span class="nb">self</span><span class="p">.</span><span class="n">someLabel</span><span class="p">.</span><span class="n">textColor</span> <span class="o">=</span> <span class="p">[</span><span class="bp">UIColor</span> <span class="n">blueColor</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'><span class="p">[</span><span class="bp">UIView</span> <span class="nl">animateWithDuration</span><span class="p">:</span><span class="mf">0.3</span>
</span><span class='line'> <span class="nl">animation</span><span class="p">:</span><span class="o">^</span><span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">someLabel</span><span class="p">.</span><span class="n">textColor</span> <span class="o">=</span> <span class="p">[</span><span class="bp">UIColor</span> <span class="n">redColor</span><span class="p">];</span>
</span><span class='line'> <span class="p">}];</span>
</span></code></pre></td></tr></table></div></figure>
<p>But there is a simple solution. Instead of animating property we will perform transition on object itself.</p>
<p>Using <code>transitionWithView</code> should solve our problem:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='objC'><span class='line'><span class="nb">self</span><span class="p">.</span><span class="n">someLabel</span><span class="p">.</span><span class="n">textColor</span> <span class="o">=</span> <span class="p">[</span><span class="bp">UIColor</span> <span class="n">blueColor</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'><span class="p">[</span><span class="bp">UIView</span> <span class="nl">transitionWithView</span><span class="p">:</span><span class="nb">self</span><span class="p">.</span><span class="n">someLabel</span>
</span><span class='line'> <span class="nl">duration</span><span class="p">:</span><span class="mf">0.3</span>
</span><span class='line'> <span class="nl">options</span><span class="p">:</span><span class="n">UIViewAnimationOptionTransitionCrossDissolve</span>
</span><span class='line'> <span class="nl">animations</span><span class="p">:</span><span class="o">^</span><span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">someLabel</span><span class="p">.</span><span class="n">textColor</span> <span class="o">=</span> <span class="p">[</span><span class="bp">UIColor</span> <span class="n">redColor</span><span class="p">];</span>
</span><span class='line'>
</span><span class='line'> <span class="p">}</span> <span class="nl">completion</span><span class="p">:</span><span class="nb">nil</span><span class="p">];</span>
</span></code></pre></td></tr></table></div></figure>
<p>This creates nice fade in/out animation which is exactly what we want.</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Fixing UICatalog invalid asset error]]></title>
<link href="http://nshint.io/blog/2015/07/02/fixing-uicatalog-invalid-asset-error/"/>
<updated>2015-07-02T17:29:00+02:00</updated>
<id>http://nshint.io/blog/2015/07/02/fixing-uicatalog-invalid-asset-error</id>
<content type="html"><![CDATA[<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>CUICatalog: Invalid asset name supplied: (null), or invalid scale factor: 2.000000</span></code></pre></td></tr></table></div></figure>
<p>This error may happen when you try to load <code>UIImage</code> and your asset string is <code>nil</code>. For now this will not crash your app but may case some future problems. This may also lead to some UI inconsistency. To track down issue like this we need to set symbolic breakpoint:</p>
<p><img class="center" src="http://nshint.io/images/uicatalog_invalid_asset/null_asset.png"></p>
<p>Add <code>$arg3 == nil</code> condition (on Simulator) or <code>$r0 == nil</code> condition on iPhone device. This will stop executing your app exactly in the line where you try to load broken image.</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Tracking down drawing errors]]></title>
<link href="http://nshint.io/blog/2015/06/27/tracking-drawing-errors/"/>
<updated>2015-06-27T11:35:32+02:00</updated>
<id>http://nshint.io/blog/2015/06/27/tracking-drawing-errors</id>
<content type="html"><![CDATA[<p>Do you sometimes see this in your code while performing custom drawing using <code>drawRect</code>?</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class=''><span class='line'><Error>: CGContextSaveGState: invalid context 0x0
</span><span class='line'><Error>: CGContextSetBlendMode: invalid context 0x0
</span><span class='line'><Error>: CGContextSetAlpha: invalid context 0x0
</span><span class='line'><Error>: CGContextTranslateCTM: invalid context 0x0
</span><span class='line'><Error>: CGContextScaleCTM: invalid context 0x0
</span><span class='line'><Error>: CGContextDrawImage: invalid context 0x0
</span><span class='line'><Error>: CGContextRestoreGState: invalid context 0x0</span></code></pre></td></tr></table></div></figure>
<p>And as always is very hard to track, because you cannot exactly say which draw command actually cause this or where does it comes from.
But there is a simple solution to this:</p>
<p>Use this symbolic breakpoint <code>CGPostError</code> in your xcode to stop executing on exact line where drawing error appears.</p>
<p><img class="center" src="http://nshint.io/images/track-drawin-errors/screen_cgposterror.png"></p>
<p>Now you can see all callstack and all values to find root cause of incorrect drawing.</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Storyboard Localization]]></title>
<link href="http://nshint.io/blog/2015/06/25/storyboard-localization/"/>
<updated>2015-06-25T08:00:00+02:00</updated>
<id>http://nshint.io/blog/2015/06/25/storyboard-localization</id>
<content type="html"><![CDATA[<p>Internationalizing the users interface in Xcode is <a href="https://developer.apple.com/library/ios/documentation/MacOSX/Conceptual/BPInternational/InternationalizingYourUserInterface/InternationalizingYourUserInterface.html">really easy</a>. Xcode separates all the texts from your views in a dictionary. However, we can make it better, using <code>extensions</code> and <code>@IBDesignables</code>. How handy would it be, if setting localized strings were as easy as the following?<br/><br/>
<img class="center" src="http://nshint.io/images/storyboard-localization/1.png">
<br/></p>
<p>Easier than that, are the <code>extensions</code> to unleash this fancy feature.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
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<span class='line-number'>43</span>
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<span class='line-number'>47</span>
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<span class='line-number'>55</span>
<span class='line-number'>56</span>
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<span class='line-number'>64</span>
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<span class='line-number'>82</span>
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<span class='line-number'>84</span>
<span class='line-number'>85</span>
<span class='line-number'>86</span>
<span class='line-number'>87</span>
<span class='line-number'>88</span>
<span class='line-number'>89</span>
<span class='line-number'>90</span>
<span class='line-number'>91</span>
<span class='line-number'>92</span>
<span class='line-number'>93</span>
<span class='line-number'>94</span>
<span class='line-number'>95</span>
<span class='line-number'>96</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="k">extension</span> <span class="bp">UITextField</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedPlaceholder</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">placeholder</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedText</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">text</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UITextView</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedText</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">text</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UIBarItem</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedTitle</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">title</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UILabel</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedText</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">text</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UINavigationItem</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedTitle</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">title</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UIButton</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedTitle</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">setTitle</span><span class="p">(</span><span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">),</span> <span class="nl">forState</span><span class="p">:</span> <span class="n">UIControlState</span><span class="p">.</span><span class="n">Normal</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UISearchBar</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedPrompt</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">prompt</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localizedPlaceholder</span><span class="p">:</span> <span class="n">String</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="s">""</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="nb">self</span><span class="p">.</span><span class="n">placeholder</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">newValue</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UISegmentedControl</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="p">@</span><span class="n">IBInspectable</span> <span class="k">var</span> <span class="nl">localized</span><span class="p">:</span> <span class="n">Bool</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span> <span class="k">return</span> <span class="nb">true</span> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="k">for</span> <span class="n">index</span> <span class="k">in</span> <span class="mf">0.</span><span class="p">.</span><span class="o"><</span><span class="n">numberOfSegments</span> <span class="p">{</span>
</span><span class='line'> <span class="k">var</span> <span class="n">title</span> <span class="o">=</span> <span class="n">NSLocalizedString</span><span class="p">(</span><span class="n">titleForSegmentAtIndex</span><span class="p">(</span><span class="n">index</span><span class="p">)</span><span class="o">!</span><span class="p">,</span> <span class="nl">comment</span><span class="p">:</span> <span class="s">""</span><span class="p">)</span>
</span><span class='line'> <span class="n">setTitle</span><span class="p">(</span><span class="n">title</span><span class="p">,</span> <span class="nl">forSegmentAtIndex</span><span class="p">:</span> <span class="n">index</span><span class="p">)</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p><code>UISegmentedControl</code> may have multiple segments. In this case, set the <code>localized</code> to <code>true</code> and put the localized key into the storyboard. The extension will lookup into it and return the right value for every segment.</p>
<p><img class="center" src="http://nshint.io/images/storyboard-localization/2.png"></p>
<p>Way better, don’t you think? Now you have a shortcut for setting localized strings.</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Detailed Exceptions]]></title>
<link href="http://nshint.io/blog/2015/06/24/detailed-exceptions/"/>
<updated>2015-06-24T10:00:00+02:00</updated>
<id>http://nshint.io/blog/2015/06/24/detailed-exceptions</id>
<content type="html"><![CDATA[<p>There are a lot of tools in Xcode that help us during the debugging process. No doubt. Breakpoints for example are these tiny signals that tell the debugger to temporarily suspend execution of program at a certain point. My favourite type of breakpoints are the exceptional ones. Exceptional breakpoint is this guardian that pauses the execution of our program, as soon as it knows that things are going to be pretty bad.
When this happens, we are usually presented with all the stack trace and in the blink of an eye we know what happened that was bad. This is the usual scenario.</p>
<p>But sometimes we see things like that:</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-3347.44/UITableView.m:1623</span></code></pre></td></tr></table></div></figure>
<p>Which with tells us literally nothing, when we are not familiar enough with the code that we are working. We get sterile error message that tells us that we are doing something wrong with UITableView animations, but it’s all we get out of the box.</p>
<p>However, there is a way to get more detailed info. The thing that we can do to know the issue of our crash is this:</p>
<p><img class="right" src="http://nshint.io/images/detailed-exceptions/1.png"></p>
<ol>
<li>Go do debug navigator</li>
<li>Select <code>objc_exception_throw</code> frame</li>
<li>Go to console</li>
<li>Type in: <code>po $eax</code> when using simulator or <code>po $r0</code> when debugging on a device.</li>
</ol>
<p><img class="center" src="http://nshint.io/images/detailed-exceptions/2.png"></p>
<p>This way you get more detailed error description which tells you a lot more about the place that you should be looking for to find your mistake.</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Toggle Slow Animations]]></title>
<link href="http://nshint.io/blog/2015/06/23/toggle-slow-animations/"/>
<updated>2015-06-23T22:36:49+02:00</updated>
<id>http://nshint.io/blog/2015/06/23/toggle-slow-animations</id>
<content type="html"><![CDATA[<p>iOS Simulator has a feature that slows animations, you can toggle it either by pressing <code>⌘T</code> or choosing <code>Debug > Toggle Slow Animations in Frontmost App</code>. It’s very useful, but what if we want to do the same on device? It’s easy, fast and simple.</p>
<p><code>CALayer</code> has a property called <code>speed</code>, which is a time multiplier. This means that if we have an animation with a duration of 1 second, and set the layer’s speed to 2, it’ll take just 0.5 seconds to finish. The best thing about it is that it’s related to the parent layer. So when we change the speed of a particular <code>CALayer</code>, every child layer will be affected. So, if we change <code>UIWindow</code> layer speed, every <code>CALayer</code> in our application will perform animations with that custom speed value. That leaves us with this two extensions:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="k">extension</span> <span class="bp">UIWindow</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">var</span> <span class="nl">slowAnimationsEnabled</span><span class="p">:</span> <span class="n">Bool</span> <span class="p">{</span>
</span><span class='line'> <span class="kr">get</span> <span class="p">{</span>
</span><span class='line'> <span class="k">return</span> <span class="n">layer</span><span class="p">.</span><span class="n">speed</span> <span class="o">!=</span> <span class="mi">1</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="kr">set</span> <span class="p">{</span>
</span><span class='line'> <span class="n">layer</span><span class="p">.</span><span class="n">speed</span> <span class="o">=</span> <span class="n">newValue</span> <span class="o">?</span> <span class="mf">0.2</span> <span class="o">:</span> <span class="mi">1</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="k">extension</span> <span class="bp">UIApplication</span> <span class="p">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">func</span> <span class="n">setSlowAnimationsEnabled</span><span class="p">(</span><span class="nl">enabled</span><span class="p">:</span> <span class="n">Bool</span><span class="p">)</span> <span class="p">{</span>
</span><span class='line'> <span class="n">windows</span><span class="p">.</span><span class="n">map</span><span class="p">({</span> <span class="n">window</span> <span class="k">in</span> <span class="p">(</span><span class="n">window</span> <span class="kt">as</span><span class="o">?</span> <span class="bp">UIWindow</span><span class="p">)</span><span class="o">?</span><span class="p">.</span><span class="n">slowAnimationsEnabled</span> <span class="o">=</span> <span class="n">enabled</span> <span class="p">})</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>And you can call it in both ways:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='swift'><span class='line'><span class="bp">UIApplication</span><span class="p">.</span><span class="n">sharedApplication</span><span class="p">().</span><span class="n">keyWindow</span><span class="o">?</span><span class="p">.</span><span class="n">slowAnimationsEnabled</span> <span class="o">=</span> <span class="nb">true</span>
</span><span class='line'><span class="bp">UIApplication</span><span class="p">.</span><span class="n">sharedApplication</span><span class="p">().</span><span class="n">setSlowAnimationsEnabled</span><span class="p">(</span><span class="nb">true</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<p>You can go further and expose this to your testers, through iOS Settings Bundle or a fancy shake gesture. Pretty handy!</p>
]]></content>
</entry>
</feed>