Add instructions to change backing view.

[kapoorsahil]

I want a subview of my controller to change loading state. Is it possible?

I added this to my controller but doesn't work

var backingView: UIView {
    return contentView
}

[alinekborges]

Try this, it worked fine for me :)

[drpawelo]

@alinekborges Thanks so much!
here's your answer as text (and with some explanation):

1. Your ViewController already most likely adopts StatefulViewController protocol. Make it also adopt BackingViewProvider protocol like this:
   open class GenericCollectionVC: UIViewController, StatefulViewController, BackingViewProvider {
2. then in your code re-define what view should hold all the StatefulViews (emptyView, loadingView, errorView) by defining backingView variable
   public var backingView: UIView { return self.collectionView }
3. Note that I set self.collectionView to be the parent view of my StatefulViews, but you can use any view there