ios - 自动布局显示警告消息

Question

我在自动布局方面遇到了一些问题。一切都显示正确，一切正常，但我在命令行中收到一些警告消息:

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:0xb6a60f0 H:[UIImageView:0xb645e40(75)]>",
"<NSLayoutConstraint:0xb6d0e90 H:[UIView:0xb6c7350(220)]>",
"<NSLayoutConstraint:0xb6aaea0 H:|-(10)-[UIImageView:0xb645e40]   (Names: '|':UITableViewCellContentView:0xb6c1590 )>",
"<NSLayoutConstraint:0xb6c85c0 H:[UIView:0xb6c7350]-(7)-|   (Names: '|':UITableViewCellContentView:0xb6c1590 )>",
"<NSLayoutConstraint:0xb6d2270 H:[UIImageView:0xb645e40]-(8)-[UIView:0xb6c7350]>",
"<NSAutoresizingMaskLayoutConstraint:0xb6abd20 h=--& v=--& H:[UITableViewCellContentView:0xb6c1590(300)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0xb6d0e90 H:[UIView:0xb6c7350(220)]>

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.

这是我的 nib 文件的样子:

如您所见，它是一个 TableViewCell，我正在使用一个带有 TextView(适用于 iOS7)和一个 AttributedTextView(适用于 iOS6)的 View (示例文本)!

有什么问题？

Answer 1

问题是你有冲突的约束...自动布局有时会很痛苦。 当我遇到这种情况时，我通常会清除所有约束，然后通过选择清除所有约束重新开始。

之后您也可以选择“添加缺少的约束”，并希望 XCode 自动知道您想要做什么。实际上 XCode 有 50-50 的机会正确完成。

从你的屏幕截图来看，你的约束似乎太多了，所以另一种选择是尝试一个一个地删除，并捕捉那些“冲突”的约束。