我试图移除约束条件。我希望在纵向和横向布局方面设置不同的约束条件。如果我将方向更改为纵向,则调用函数setupConstrainsInPortrait,反之亦然。我有两个函数。
此函数设置纵向模式。
func setupConstrainsInPortrait() {
view.addSubview(myView)
myView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
myView.topAnchor.constraint(equalTo: view.topAnchor, constant: 50).isActive = true
myView.heightAnchor.constraint(equalToConstant: 300).isActive = true
myView.widthAnchor.constraint(equalToConstant: view.frame.size.width).isActive = true
view.addSubview(switchKmM)
switchKmM.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
switchKmM.topAnchor.constraint(equalTo: myView.bottomAnchor, constant: 10).isActive = true
switchKmM.heightAnchor.constraint(equalToConstant: 50).isActive = true
switchKmM.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
view.addSubview(speedLbl)
speedLbl.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
speedLbl.topAnchor.constraint(equalTo: view.bottomAnchor, constant: -50).isActive = true
speedLbl.heightAnchor.constraint(equalToConstant: 50).isActive = true
speedLbl.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
}
这个函数设置横向模式。
func setupConstrainsInLandScape() {
view.addSubview(myView)
myView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 10).isActive = true
myView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
myView.heightAnchor.constraint(equalToConstant: 300).isActive = true
myView.widthAnchor.constraint(equalToConstant: 150).isActive = true
view.addSubview(switchKmM)
switchKmM.leftAnchor.constraint(equalTo: myView.rightAnchor, constant: 30).isActive = true
switchKmM.topAnchor.constraint(equalTo: view.topAnchor, constant: 30).isActive = true
switchKmM.heightAnchor.constraint(equalToConstant: 50).isActive = true
switchKmM.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
}
我在viewWillTransition中使用这些函数。
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
if UIDevice.current.orientation.isLandscape {
print("landscape!")
view.backgroundColor = .green
setupConstrainsInLandScape()
self.viewWillLayoutSubviews()
}
else {
print("portrét")
view.backgroundColor = .white
setupConstrainsInPortrait()
self.viewWillLayoutSubviews()
}
super.viewWillTransition(to: size, with: coordinator)
}
问题是,从肖像模式中的约束条件在横向模式下没有被删除。
我希望有人能帮助我...谢谢。
isActive = true
。你从未说过isActive = false
。因此,你只是不断地添加约束,而从未删除任何约束。在这种情况下,你期望什么呢? - matt