ios - Swift Xcode 会尝试通过打破约束来恢复吗？
<p><p>当我用 Swift 4 开发我的应用程序午餐时，我在 xCode 日志上收到消息，我的 tableview 有多个不同的单元格，大约 12 个不同的单元格，我收到的警告消息是:</p>
<pre><code>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.
2017-08-21 09:27:57.404497+0300 muzeit 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.
(
"<NSLayoutConstraint:0x174481770 V:|-(0)- (active, names: '|':UIView:0x107a09d10 )>",
"<NSLayoutConstraint:0x174481860 V:-(-60)-| (active, names: '|':UIView:0x107a09d10 )>",
"<NSLayoutConstraint:0x1744818b0 UIImageView:0x107a09eb0.centerY == UIView:0x107a09d10.centerY (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1744818b0 UIImageView:0x107a09eb0.centerY == UIView:0x107a09d10.centerY (active)>
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.
2017-08-21 09:27:57.492890+0300 muzeit 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.
(
"<NSLayoutConstraint:0x17048b770 V:|-(0)- (active, names: '|':UIView:0x107a30a90 )>",
"<NSLayoutConstraint:0x17048b860 V:-(-60)-| (active, names: '|':UIView:0x107a30a90 )>",
"<NSLayoutConstraint:0x17048b8b0 UIImageView:0x107a30c30.centerY == UIView:0x107a30a90.centerY (active)>"
)
</code></pre>
<p>我试图用谷歌搜索它以找到一些解决方法，我找不到明确的答案，而且断点也没有显示约束有问题! </p>
<p>有什么想法吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>如果您想更好地了解日志试图告诉您的内容，您可以查看 <a href="https://developer.apple.com/library/archive/documentation/UserExperience/Conceptual/AutolayoutPG/VisualFormatLanguage.html#//apple_ref/doc/uid/TP40010853-CH27-SW1" rel="noreferrer noopener nofollow">Visual Format Language</a> .您可以按如下方式“翻译”您的日志:</p>
<p><code>V:|-(0)-</code> = 在父 View 的顶部 (|) 和 ImageView 之间设置一个 0 点的垂直 (V:) 空间</p >
<p><code>V:-(-60)-|</code> = 在 UIImageView 底部和父 View(|) 之间设置 -60 点的垂直 (V:) 空间</p>
<p><code>UIImageView:0x107a09eb0.centerY == UIView:0x107a09d10.centerY (active)</code> = 垂直居中 UIImageView 到 superview</p>
<p>通过翻译，现在更容易理解你的 UIImageView 被固定在顶部和底部，这与第三个约束冲突，即试图垂直居中 UIImageView。 </p>
<p>正如@ReinerMeilan 在评论中所建议的，您可以删除 centerY 约束来解决此自动布局问题。 </p></p>
<p style="font-size: 20px;">关于ios - Swift Xcode 会尝试通过打破约束来恢复吗？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/45790601/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45790601/
</a>
</p>
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