I have worked once on a ViewController that should support drag & drop of a child ViewController with a certain amount of fixed sheet states. I want to share how such a feature can be implemented.
This article is part 7 of my UIKit Cheatsheet series. It deals with loading indicators.
This article is part 6 of my UIKit Cheatsheet series. It deals with adaptive view heights.
This article is part 5 of my UIKit Cheatsheet series. It deals with different presentation modes for ViewControllers.
This article is part 4 of my UIKit Cheatsheet series. It deals with roundings for all kinds of UIViews.
This article is part 3 of my UIKit Cheatsheet series. It deals with tricks for UIButton.