禁用调试控制台输出自动布局约束错误信息以x code

问题描述

有没有一种办法（临时）禁用自动布局错误/警告消息：

 无法同时满足约束条件。
    大概在以下列表中的约束条件中的至少一个是一个你不想要的。试试这个：（1）看一下每个约束和揣摩，你不要指望; （2）找到code，它增加了不必要的约束或限制并修复它。 （注：如果你看到你不明白NSAutoresizingMaskLayoutConstraints，请参阅文档UIView的财产translatesAutoresizingMaskIntoConstraints）
（
    ＆所述; NSLayoutConstraint：0x170098420 H：[UIView的：0x15c62c100（2）]＆gt;中，
    ＆所述; NSLayoutConstraint：0x170098600的UIView：0x15c6294f0.leading ==的UIView：0x15c628d40.leadingMargin  -  8＆gt;中，
    ＆所述; NSLayoutConstraint：0x170098650 H：[UIView的：0x15c6294f0]  - （0） -  [UIView的：0x15c62b750]＆gt;中，
    ＆LT; NSLayoutConstraint：0x1700986a0的UIView：0x15c62b750.width ==的UIView：0x15c6294f0.width＆gt;中，
    ＆所述; NSLayoutConstraint：0x1700986f0的UIView：0x15c628d40.trailingMargin ==的UIView：0x15c62b750.trailing  -  8＆gt;中，
    ＆所述; NSLayoutConstraint：0x170098880 H：[UIView的：0x15c6294f0]  - （0） -  [UIView的：0x15c62c100]＆gt;中，
    ＆所述; NSLayoutConstraint：0x1700988d0的UIView：0x15c628d40.centerX ==的UIView：0x15c62c100.centerX +1 gt;中
）将试图打破约束恢复
＆所述; NSLayoutConstraint：0x170098420 H：[UIView的：0x15c62c100（2）]≥做一个象征性的断点UIViewAlertForUnsatisfiableConstraints赶上这在调试器。
在UIView的的UIConstraintBasedLayoutDebugging类别中列出的方法＆LT;的UIKit / UIView.h＆GT;也可能是有帮助的。
 

解决方案

做了一些反编译，实际上有一种方法：

斯威夫特

  NSUserDefaults.standardUserDefaults（）的setValue（假，forKey：_UIConstraintBasedLayoutLogUnsatisfiable）。
 

目标-C

  [NSUserDefaults的standardUserDefaults]的setValue：@（NO）forKey：@_ UIConstraintBasedLayoutLogUnsatisfiable];
 

现在你只能得到通知_UIConstraintBasedLayoutLogUnsatisfiable为OFF。

任何人阅读本强制性提醒：这应该是最后的手段，对调试技巧和解决问题的约束WWDC看到的自动布局之谜的会议：的和部分2 。

Is there a way to (temporarily) disable autolayout error/warning messages:

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:0x170098420 H:[UIView:0x15c62c100(2)]>",
    "<NSLayoutConstraint:0x170098600 UIView:0x15c6294f0.leading == UIView:0x15c628d40.leadingMargin - 8>",
    "<NSLayoutConstraint:0x170098650 H:[UIView:0x15c6294f0]-(0)-[UIView:0x15c62b750]>",
    "<NSLayoutConstraint:0x1700986a0 UIView:0x15c62b750.width == UIView:0x15c6294f0.width>",
    "<NSLayoutConstraint:0x1700986f0 UIView:0x15c628d40.trailingMargin == UIView:0x15c62b750.trailing - 8>",
    "<NSLayoutConstraint:0x170098880 H:[UIView:0x15c6294f0]-(0)-[UIView:0x15c62c100]>",
    "<NSLayoutConstraint:0x1700988d0 UIView:0x15c628d40.centerX == UIView:0x15c62c100.centerX + 1>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170098420 H:[UIView:0x15c62c100(2)]>

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.

解决方案

Did some decompiling and there's actually a way:

Swift

NSUserDefaults.standardUserDefaults().setValue(false, forKey: "_UIConstraintBasedLayoutLogUnsatisfiable")

Objective-C

[[NSUserDefaults standardUserDefaults] setValue:@(NO) forKey:@"_UIConstraintBasedLayoutLogUnsatisfiable"];

Now you'll only get notified that "_UIConstraintBasedLayoutLogUnsatisfiable is OFF".

Obligatory reminder for anyone reading this: this should be last resort, for tips on debugging and fixing constraint issues see WWDC's "Mysteries of Auto Layout" sessions: part 1 and part 2.

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