我有一个名为 DetailView 的 UIView,具有以下限制:
DetailView.top = top
DetailView.trailing = Safe Area.trailing
DetailView.leading = Safe Area.leading
height = 295
全部在 StoryBoard 中制作。 DetailView is this gray rectangle on an image
我想在点击一个按钮后改变这个 UIView 的高度,所以我有 IBAction 来实现这个
@IBAction func detailViewTapped(_ sender: Any) {
if detailViewHeightConstraint.constant < 500 {
detailViewHeightConstraint.constant = 523
UIView.animate(withDuration: 0.5) {
self.detailView.layoutIfNeeded()
}
arrowImageView.image = UIImage(named: "up-arrow")
} else {
detailViewHeightConstraint.constant = 295
UIView.animate(withDuration: 0.5) {
self.detailView.layoutIfNeeded()
}
arrowImageView.image = UIImage(named: "down-arrow")
}
}
改变大小效果很好,但动画效果不行。我想实现扩展到底部的效果,但是动画在屏幕之间开始,并且正在扩展到底部和顶部。 Start of animation can be seen on this picture怎样才能达到理想的效果?
最佳答案
动画主视图
@IBAction func detailViewTapped(_ sender: Any) {
if detailViewHeightConstraint.constant < 500 {
detailViewHeightConstraint.constant = 523
UIView.animate(withDuration: 0.5) {
self.view.layoutIfNeeded()
}
arrowImageView.image = UIImage(named: "up-arrow")
} else {
detailViewHeightConstraint.constant = 295
UIView.animate(withDuration: 0.5) {
self.view.layoutIfNeeded()
}
arrowImageView.image = UIImage(named: "down-arrow")
}
}
关于ios - UIView的高度约束动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48450959/