I am developing an iOS application in swift and am having difficulty animating during the controller transition. In particular, I implemented UINavigationControllerDelegate to listen when a specific view is clicked. When this view is clicked, I want to hide the panel at the bottom of the screen. My code works almost perfectly, however, whenever I start the animation at the height of the navigation controller, the current view (which is deleted) correctly animates its height, but the new controller that is already pressed has a new height from the animation. To put some code in it, the following function is called from my UINavigationControllerDelegate willShow function of the viewController function:
func animatePlayerVisibility(_ visible: Bool) {
if visible == showingPlayer {
return
}
showingPlayer = visible
let height: CGFloat = visible ? 56.0 : 0.0
self.view.layoutIfNeeded()
UIView.animate(withDuration: 0.35) {
self.playerHeight.constant = height
self.viewBottom.constant = height
self.view.layoutIfNeeded()
}
}
'playerHeight' - IBOutlet . 'viewBottom' IBOutlet . , , .
,
self.viewBottom.constant = height
self.viewBottom.constant = height * 2.0
imgur- :
http://imgur.com/a/znAim
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EDIT: * 2.
https://imgur.com/a/2a5Sw