[英]iOS: UIView origin y not changing on iOS 9
我正在尝试在显示keyboard
时设置self.mainView.frame.origin.y
。 它可以在iOS 11
上正常运行,但不能在iOS 9
。
这是我的代码:
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
print("=== textFieldShouldBeginEditing 1 \(self.mainView.frame.origin.y) ")
self.mainView.frame.origin.y -= 150
self.mainView.setNeedsLayout()
self.mainView.layoutIfNeeded()
print("=== textFieldShouldBeginEditing 2 \(self.mainView.frame.origin.y) ")
return true
}
internal func textFieldShouldReturn(_ textField: UITextField) -> Bool {
print("=== textFieldShouldReturn 1 \(self.mainView.frame.origin.y) ")
self.mainView.frame.origin.y = self.normalMainViewOriginY
textField.endEditing(true)
print("=== textFieldShouldReturn 2 \(self.mainView.frame.origin.y) ")
return true
}
在viewDidLoad()
:
self.normalMainViewOriginY = self.mainView.frame.origin.y
我也使用NSNotification
测试了相同的想法,但在iOS 9
遇到了相同的问题
这些是打印输出:
iOS 9:
=== normalMainViewOriginY:243.0(来自viewDidLoad()
)
=== textFieldShouldBeginEditing 1:208.5
=== textFieldShouldBeginEditing 2:208.5
=== textFieldShould返回1:208.5
=== textFieldShouldReturn 2:243.0
iOS 11:
=== normalMainViewOriginY:243.0(来自viewDidLoad()
)
=== textFieldShouldBeginEditing 1:208.5
=== textFieldShouldBeginEditing 2:58.5
=== textFieldShould返回1:58.5
=== textFieldShouldReturn 2:243.0
问题在于,更改框架不会影响下划线的布局约束,因此请尝试使用约束不会失败,例如您将mainView的顶部约束作为mainViewTopCon
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
print("=== textFieldShouldBeginEditing 1 \(self.mainView.frame.origin.y) ")
self.mainViewTopCon.constant -= 150
self.mainView.layoutIfNeeded()
print("=== textFieldShouldBeginEditing 2 \(self.mainView.frame.origin.y) ")
return true
}
internal func textFieldShouldReturn(_ textField: UITextField) -> Bool {
print("=== textFieldShouldReturn 1 \(self.mainView.frame.origin.y) ")
self.mainViewTopCon.constant = 0 // or value in IB that you set initally
self.mainView.layoutIfNeeded()
textField.endEditing(true)
print("=== textFieldShouldReturn 2 \(self.mainView.frame.origin.y) ")
return true
}
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