i有一个包含子视图的Uiview。该子视图通过约束更改和layoutifneed()函数进行动画:
for i in 1...cardViews.count - 1 {
let currentCard = cardViews[i]
let previousCard = cardViews[i-1]
// Set new offset
currentCard.topConstraint?.constant = previousCard.contentView.frame.height + configuration.expandedOffset
}
// To animate constraints's changes
UIView.animate(withDuration: TimeInterval(duration), delay: 0, options: [.curveEaseOut], animations: {
self.layoutIfNeeded()
}, completion: nil)
但是,当我这样做时,它也会使父母的矛盾变化动画。这样的东西:
self.Height == containerView.Height
如何调用layoutifneed()来使我的子视图动画,而不是父母?
编辑:副作用:http://gph.is/2noi3w9
您可以在uiview.animate
的内部调用它for i in 1...cardViews.count - 1 {
let currentCard = cardViews[i]
currentCard.layoutIfNeeded()
}
而不是
self.layoutIfNeeded()