我正在使用故事板为应用程序构建ui，并使用了swift，并且我准备了以下布局，您可以在屏幕截图中看到。
我想隐藏包含stop1详细信息的视图，并在运行时将stop2视图替换为stop1。
我正在使用以下代码隐藏stop1＆更新stop2的约束
stop1Frame.hidden = true
stop2Frame.updateConstraints()
请帮我。
将高度限制设置为stop1的0可以正常工作，但在控制台中显示以下错误。
2015-03-13 17:03:52.738 GroundSpan[5392:1777378] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7a644500 V:[UILabel:0x7a643d50'Please tap on + button to...'(63)]>",
"<NSLayoutConstraint:0x7a64cb80 V:[UIView:0x7a63aaa0(0)]>",
"<NSLayoutConstraint:0x7a64cc10 UILabel:0x7a632e20'Stop1'.top == UIView:0x7a63aaa0.topMargin>",
"<NSLayoutConstraint:0x7a64d2b0 V:[UILabel:0x7a643d50'Please tap on + button to...']-(20)-| (Names: '|':UIView:0x7a63aaa0 )>",
"<NSLayoutConstraint:0x7a64d310 V:[UILabel:0x7a632e20'Stop1']-(NSSpace(8))-[UILabel:0x7a643d50'Please tap on + button to...']>")
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7a644500 V:[UILabel:0x7a643d50'Please tap on + button to...'(63)]>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2015-03-13 17:03:52.739 GroundSpan[5392:1777378] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7a64cb80 V:[UIView:0x7a63aaa0(0)]>",
"<NSLayoutConstraint:0x7a64cc10 UILabel:0x7a632e20'Stop1'.top == UIView:0x7a63aaa0.topMargin>",
"<NSLayoutConstraint:0x7a64d2b0 V:[UILabel:0x7a643d50'Please tap on + button to...']-(20)-| (Names: '|':UIView:0x7a63aaa0 )>",
"<NSLayoutConstraint:0x7a64d310 V:[UILabel:0x7a632e20'Stop1']-(NSSpace(8))-[UILabel:0x7a643d50'Please tap on + button to...']>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7a64d310 V:[UILabel:0x7a632e20'Stop1']-(NSSpace(8))-[UILabel:0x7a643d50'Please tap on + button to...']>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
最佳答案
创建一个到stop1的高度约束的IBOutlet，以便您可以在代码中访问它。
要隐藏stop1，请将其高度限制设置为0，以便stop2将向上移动。
@IBOutlet weak var stop1HeightConstraint: NSLayoutConstraint!
...
// in your function:
self.stop1HeightConstraint.constant = 0
UIView.animateWithDuration(0.4, animations: {
self.view.layoutIfNeeded()
})
所有这些都假定您已经正确设置了自动布局和约束。