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Last active July 27, 2018 07:14
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Note on UIKit
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note.md

Note on UIViewControllerAnimatedTransitioning and UIViewControllerInteractiveTransitioning

UINavigationController

  • Do not pass true to UIView.snapshotView(afterScreenUpdates:) when create a snapshot for animated transition object (false is fine).
  • Don't call animator.startAnimation() or animator.pauseAnimator() in startInteractiveTransition(_:)
  • If interruptibleAnimator(using:) is implemented, UINavigationController will observe fractionComplete from the returned animator object (not confirmed but very likely) and will animate the navigation bar accordingly to that value. Calling UIViewControllerContextTransitioning.updateInteractiveTransition(_:) will almost have no effect on the navigation bar animation (but you should call it anyway).
  • If interruptibleAnimator(using:) is not implemented, UINavigationController will use values that are passed to UIViewControllerContextTransitioning.updateInteractiveTransition(_:) to animate the navigation bar.

UINavigationBar

  • You cannot set the height of UINavigationBar to something other than 44. UINavigationBar will kindly set the height of itself back. Of course you can force this after viewDidLayoutSubviews for example, but you'll get jumpy transition animation.
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