Hey brian, This seems to be video 12, but it is listed to the right side of the page like 15.

I really like this method of using child view controllers. But, I don't like using convenience inits that don't do a full job, because the setup code gets split between the instantiation and the miscellaneous setup below it. So, maybe do it like this: let appIcon : UIImageView = { let appIcon = UIImageView(cornerRadius: 8) appIcon.backgroundColor = .green return appIcon }

Hey Brian, When adding collectionView.register(AppsPageHeader.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: headerCellId) I'm getting an error: [Type 'UICollectionView' has no member 'elementsKindSectionHeader'] Any idea what is causing this ?

Hi Brian, any conveniences to embed the controller into header (or cell in previous video) instead of add UICollectionView into header (or cell)?

Wondering why you don't use child.didMove(toParent: self) when adding child view controllers. More info here: https://www.swiftbysundell.com/posts/using-child-view-controllers-as-plugins-in-swift Enjoying the course so far.

You remind me of the late PBS painter Bob Ross- He was able to make the best looking paintings with such ease and making it look so easily doable. On top of that he had the most calm and peaceful demeanor. You are Bob Ross of apps!

HI Brian. Instead of using the supplementary view for the nested header collection, could you have also just used two child collectionView Controllers inside a parent ViewController? One for the header type section and one for the app groups?

Hey Brian on my header when I scroll my cell disappears

Not sure if this helps anyone, but I spent like 30min trying to get the registration of the header view to autocomplete. I restarted XCode a few times, did some research, and nada. I finally just went ahead with the other methods, built and ran and got the expected crash. As soon as I went back and tried it again, the autocomplete came right up.

Hi Brian, How to handle device rotation in collection view controller inside another collection view cell. In this case after rotating the device, the collection view embedded inside collection view changes size but doesn't revert to the size again on the device rotation.

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