无法同时满足约束

Question

实际上使用xib集成了相机应用程序，我将uiview放在视图上，之后我将imageview，再次在imageview上查看以进行裁剪。然后运行项目我收到此错误。

  

2013-07-23 12：45：49.936 Camera_App1 [30668：907]无法同时满足约束条件。可能至少下列列表中的一个约束是您不想要的约束。试试这个：（1）看看每个约束并试着找出你不期望的东西; （2）找到添加了不需要的约束或约束的代码并修复它。 （注意：如果你看到你不理解的NSAutoresizingMaskLayoutConstraints，请参阅UIView属性的文档translatesAutoresizingMaskIntoConstraints）

(
    "<NSAutoresizingMaskLayoutConstraint:0x1f5b3d10 h=--& v=--& V:[UIView:0x1f5a2f70(460)]>",
    "<NSLayoutConstraint:0x1f5a3c80 V:[UIView:0x1f5a31b0]-(385)-|   (Names: '|':UIView:0x1f5a3120 )>",
    "<NSLayoutConstraint:0x1f5a3f80 V:|-(0)-[UIView:0x1f5a3120]   (Names: '|':UIView:0x1f5a2f70 )>",
    "<NSLayoutConstraint:0x1f5a3f40 V:[UIView:0x1f5a3120]-(63)-|   (Names: '|':UIView:0x1f5a2f70 )>",
    "<NSLayoutConstraint:0x1f5a3bc0 V:|-(61)-[UIView:0x1f5a31b0]   (Names: '|':UIView:0x1f5a3120 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x1f5a3c80 V:[UIView:0x1f5a31b0]-(385)-|   (Names: '|':UIView:0x1f5a3120 )>

Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-07-23 12:45:58.697 Camera_App1[30668:907] media type=public.image
2013-07-23 12:45:58.701 Camera_App1[30668:907] global=public.image
2013-07-23 12:45:58.858 Camera_App1[30668:907] 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:0x1f5a3c80 V:[UIView:0x1f5a31b0]-(385)-|   (Names: '|':UIView:0x1f5a3120 )>",
    "<NSLayoutConstraint:0x1f5a3f80 V:|-(0)-[UIView:0x1f5a3120]   (Names: '|':UIView:0x1f5a2f70 )>",
    "<NSLayoutConstraint:0x1f5a3f40 V:[UIView:0x1f5a3120]-(63)-|   (Names: '|':UIView:0x1f5a2f70 )>",
    "<NSLayoutConstraint:0x1f5a3bc0 V:|-(61)-[UIView:0x1f5a31b0]   (Names: '|':UIView:0x1f5a3120 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x1f53a430 h=--& v=--& V:[UIView:0x1f5a2f70(460)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x1f5a3c80 V:[UIView:0x1f5a31b0]-(385)-|   (Names: '|':UIView:0x1f5a3120 )>

Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

Answer 1

错误就是它所说的，并为您提供了非常明确的指令供您开始调试。有两个冲突的约束。每个都指示自动布局运行时执行与另一个相矛盾的操作。

如果以编程方式创建和添加视图，则自动调整大小属性可能会自动转换为自动布局约束。

因此，首先要尝试的是，使用以编程方式创建的视图，通过设置禁用此功能：

myProgrammaticView.translatesAutoresizingMaskIntoConstraints = NO;

Answer 2

我知道这个帖子很老，但这是我的经验和解决方案。

选择视图（UILabel，UIImage等）编辑器＆gt; Pin＆gt; （选择...）到Superview Editor＆gt;解决自动布局问题＆gt;添加缺失约束

此错误是您添加的约束之间的冲突。删除不需要的约束。不要在同一方向和类型中使用多个约束。

我建议您使用SnapKit。它是一个Autolayout框架，使用起来非常方便

 import SnapKit

 var label = UILabel()

 label.snp_makeConstraints { (make) -> Void in
    make.centerX.equalTo(0)
    make.centerY.equalTo(0)
    make.width.equalTo(30)
    make.height.equalTo(30)
 }

https://github.com/SnapKit/SnapKit希望这有用：）

Answer 3

尝试此步骤，对我有帮助。

  

选择对象>编辑器>解决自动布局问题>重置为建议的约束

Answer 4

就我而言，由于导航栏，我遇到此错误。添加新的UIViewController导致此错误。

  

我删除了旧的导航栏，然后通过转到   编辑器➞嵌入➞导航控制器。

Answer 5

我重置为建议的约束，它解决了问题see here.

选择对象>编辑器>解决自动布局问题>重置为建议的约束