How do I set the collection view's position in my viewcontroller?

[junweimah]

In the demo app Main.storyboard > DemoViewController, all I see is this :

There is nothing to configure the collection view where it needs to me.

When I implement it in my project, it looks like this on 5s:

How do I set constraint for it in my viewcontroller?

Thanks

[GeekerX]

All the Collections are added programmatically.
In Second place in you .xib expanding collection you must put the FrontContainer over the BackContainer in the Tree View

[junweimah]

How do I set the constraint for the front view? I want them to appear lets say 20 top, 10 left, 10 right in my view controller. How can I do that programmatically?