设备旋转更改时会创建其他约束

Question

我有一个带有其约束的子视图，该子视图已通过IBOutlet引用了超级视图，我通过取消激活约束然后给出新值并再次激活来更改约束，这种方法工作正常且没有警告，但是当设备旋转并发生故障时会出现问题似乎正在添加另一个约束（我在情节提要中添加的约束） 代码：

bottomViewBottomConstraint.isActive = false
if self.isHide {
    bottomViewBottomConstraint = bottomView.bottomAnchor.constraint(equalTo: playerView.bottomAnchor,constant:0)
}
else {
    bottomViewBottomConstraint = bottomView.bottomAnchor.constraint(equalTo: playerView.bottomAnchor,constant:bottomView.frame.height + 50)
}
bottomViewBottomConstraint.isActive = true

旋转后警告：

"<NSLayoutConstraint:0x600003fdce60 UIView:0x7fc034f050b0.bottom == PlayKit.PlayerView:0x7fc034f69870.bottom + 143.333   (active)>",
"<NSLayoutConstraint:0x600003fe3480 'bottomViewId' V:[UIView:0x7fc034f050b0]-(0)-|   (active, names: 
'|':PlayKit.PlayerView:0x7fc034f69870 )>"

底视图情节提要板约束

Answer 1

您需要viewDidLoad中的一个

var bottomViewBottomConstraint:NSLayoutConstraint!

---

bottomViewBottomConstraint = bottomView.bottomAnchor.constraint(equalTo: playerView.bottomAnchor,constant:0)

---

并不断播放

bottomViewBottomConstraint.constant = self.isHide ? 0 :   bottomView.frame.height + 50
self.view.layoutIfNeeded()