视图的Frame被调用两次并导致裁剪错误
视图的Frame被调用两次并导致裁剪错误
提问于 2019-03-28 23:59:51
我有一个基本的UIView，它有一个visualEffectView作为它的子视图。我将visualEffectView的视图frame.height设置为80。在向ViewController演示时，我希望将其高度重置为120。目前，当显示时，高度最初为120，但随后迅速回落到80。我的ViewController中的帧不应该覆盖UIView中设置的帧吗？我在ViewController中的帧首先被调用，但后来它被UIView调用，导致了裁剪错误。
class CardView: UIView {
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
override init(frame: CGRect) {
super.init(frame: frame)
clipsToBounds = true
addSubview(visualEffectView)
}
override func layoutSubviews() {
super.layoutSubviews()
visualEffectView.anchor(top: topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 80)
}
}
class ViewController: ViewController {
let cardView: CardView = {
let cv = CardView()
cv.imageView.clipsToBounds = true
cv.layer.cornerRadius = 18
return cv
}()
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let superviewFrame = view.frame.height
cardView.frame = CGRect(x: 10, y: superviewFrame / 8, width: view.frame.width - 20, height: superviewFrame - (superviewFrame / 5))
cardView.visualEffectView.anchor(top: cardView.topAnchor, left: cardView.leftAnchor, bottom: nil, right: cardView.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 120)
}
}回答 2
Stack Overflow用户
发布于 2019-03-29 01:15:41
尝试移动此代码
visualEffectView.anchor(top: topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 80)
从override func layoutSubviews() {到override init(frame: CGRect) {
在super.init()之后
Stack Overflow用户
发布于 2019-03-29 04:17:43
您可能需要一个保护条件，如果有约束，只需传递即可。
override func layoutSubviews() {
super.layoutSubviews()
guard visualEffectView.constraintsAffectingLayout(for: .vertical).count == 0 else {return}. // Here
visualEffectView.anchor(top: topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 80)
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55402037
复制相关文章
相似问题