控制台中自動布局的問題

Question

我正在嘗試自動布局概念，在這里，我在控制台中遇到了更多問題，有人可以告訴我如何解決這個問題

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:0x7faeb358e200 H:|-(0)-[UIImageView:0x7faeb35834b0]   (Names: '|':UIView:0x7faeb35832c0 )>",
    "<NSLayoutConstraint:0x7faeb358e390 UILabel:0x7faeb358a1e0'Welcome to'.leading == UIView:0x7faeb35832c0.leadingMargin + 46>",
    "<NSLayoutConstraint:0x7faeb358e4d0 UIImageView:0x7faeb3585ab0.leading == UILabel:0x7faeb358a1e0'Welcome to'.leading + 28>",
    "<NSLayoutConstraint:0x7faeb358e520 UIImageView:0x7faeb3585ab0.leading == UIImageView:0x7faeb35834b0.leading + 90>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7faeb358e390 UILabel:0x7faeb358a1e0'Welcome to'.leading == UIView:0x7faeb35832c0.leadingMargin + 46>

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.
2014-12-23 16:30:57.326 Aaja[11268:148329] Unable to simultaneously satisfy constraints.

這個問題反復出現十次

Answer 1

由於這個錯誤，您有...

|[ImageView-b0]

|-46-[Label-e0]

-(+28)-[ImageView-b0]
[Label-e0]
i.e. |-74-[ImageView-b0] //this conflicts the first one.

[ImageView-b0]
-(+90)-[ImageView-b0]

這些是錯誤中顯示的不同約束。

看起來有點亂。 圖像視圖和超級視圖之間的間距為零。 然后，標簽和超級視圖之間將有46個間距。

但是，然后您嘗試將標簽和圖像視圖的左邊緣對齊，相差28。

然后，您還有另一個我不太了解的問題。 您正在告訴它使圖像視圖的前端與其自身對齊，但有所不同。 這將永遠無法工作。

它基本上是在告訴您，不能使所有約束都起作用，因為它們相互沖突，因此必須打破其中的一些約束。