如何捕获 UIViewAlertForUnsatisfiableConstraints? [英] How to trap on UIViewAlertForUnsatisfiableConstraints?
本文介绍了如何捕获 UIViewAlertForUnsatisfiableConstraints?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我看到调试器日志中出现错误:
将尝试通过打破约束来恢复<NSLayoutConstraint:0x191f0920 H:[MPKnockoutButton:0x17a876b0]-(34)-[MPDetailSlider:0x17a8bc50](LTR)>在 UIViewAlertForUnsatisfiableConstraints 处创建一个符号断点以在调试器中捕获它. 中列出的 UIView 上的 UIConstraintBasedLayoutDebugging 类别中的方法；也可能有帮助. 我如何在那个电话上设置陷阱?它没有出现在我的代码中.
解决方案
这个
Swift 项目
expr -l objc++ -O -- [[UIWindow keyWindow] _autolayoutTrace]有了这个提示，日志变得更加详细，而且我更容易确定哪个视图破坏了约束.
UIWindow:0x7f88a8e4a4a0|UILayoutContainerView:0x7f88a8f23b70||UINavigationTransitionView:0x7f88a8ca1970|||UIViewControllerWrapperView:0x7f88a8f2aab0||||•UIView:0x7f88a8ca2880|||||* UIView:0x7f88a8ca2a10||||||*UIButton:0x7f88a8c98820'存档'|||||||UIButtonLabel:0x7f88a8cb0e30'存档'||||||*UIButton:0x7f88a8ca22d0'下载'|||||||UIButtonLabel:0x7f88a8cb04e0'下载'||||||*UIButton:0x7f88a8ca1580'已删除'|||||||UIButtonLabel:0x7f88a8caf100'已删除'|||||* UIView:0x7f88a8ca33e0|||||*_UILayoutGuide:0x7f88a8ca35b0|||||*_UILayoutGuide:0x7f88a8ca4090|||||_UIPageViewControllerContentView:0x7f88a8f1a390||||||_UIQueuingScrollView:0x7f88aa031c00|||||||UIView:0x7f88a8f38070|||||||UIView:0x7f88a8f381e0||||||||•UIView:0x7f88a8f39fa0，缺少主机约束|||||||||*UIButton:0x7f88a8cb9bf0'Retrieve data'- UIButton:0x7f88a8cb9bf0'Retrieve data'.minX{id: 170}, UIButton:0x7f88a8cb9bf0'Retrieve data:'Retrieve data:'.|||||||||*UIImageView:0x7f88a8f3ad80-UIImageView 的模糊布局:0x7f88a8f3ad80.minX{id: 172}, UIImageView:0x7f88a8f3ad80.minY{id: 173}|||||||||*App.RecordInfoView:0x7f88a8cbe530- App.RecordInfoView 的不明确布局:0x7f88a8cbe530.minX{id: 174}, App.RecordInfoView:0x7f88a8cbe530.minY{id: 175}, App0a.8c75}, App0idView, App030.minX{id: 175}.RecordInfoView:0x7f88a8cbe530.Height{id: 177}||||||||||+UIView:0x7f88a8cc1d30- UIView 的模糊布局:0x7f88a8cc1d30.minX{id: 178}, UIView:0x7f88a8cc1d30.minY{id: 179}, UIView:0x7f88a8cc0d:0x7f88a8cc0d:0x7f88a8cc0d:0x7f88a8cc0d{id: 1780 cc10d {id: 178}}|||||||||||*UIView:0x7f88a8cc1ec0- UIView 的模糊布局:0x7f88a8cc1ec0.minX{id: 153}, UIView:0x7f88a8cc1ec0.minY{id: 151}, UIView:0x7f88a8cc1ec0.minX{id: 153}, UIView:0x7f88a8cc1c0.minX{id: 151}, UIView:0x7f88a8cc1ec0.minX{id: 153} 1 cc00.181ec00.18 cc01ec05.1888cc01eWidth}||||||||||||*UIView:0x7f88a8e68e10- UIView 的模糊布局:0x7f88a8e68e10.minX{id: 155}, UIView:0x7f88a8e68e10.minY{id: 150}, UIView:0x7f6f8e1a0e||||||||||||*UIImageView:0x7f88a8e65de0- UIImageView 的模糊布局:0x7f88a8e65de0.minX{id: 159}, UIImageView:0x7f88a8e65de0.minY{id: 182}||||||||||||*UILabel:0x7f88a8e69080'8-6-2015'- UILabel 的模糊布局:0x7f88a8e69080'8-6-2015'.minX{id: 183}, UILabel:0x7f88a8e69080804'id-', UILabel:0x7f88a8e69080'8-6-2015'.Width{id: 185}||||||||||||*UILabel:0x7f88a8cc0690'16:34'- UILabel 的不明确布局:0x7f88a8cc0690'16:34'.minX{id: 186}, UILabel:0x7f88a8cc0690'16:34',UILabel60180800000000:34'.Width{id: 188}, UILabel:0x7f88a8cc0690'16:34'.Height{id: 189}||||||||||||*UIView:0x7f88a8cc2050-UIView 的不明确布局:0x7f88a8cc2050.minX{id: 161}, UIView:0x7f88a8cc2050.minY{id: 166}, UIView:0x7f85016ccWidth{0x7f88a832}||||||||||||*UIImageView:0x7f88a8e69d90-UIImageView 的不明确布局:0x7f88a8e69d90.minX{id: 190}, UIImageView:0x7f88a8e69d90.minY{id: 191}, UIImageView:09f9d9f90d{id980.minX7eWidth{0x7f88a8e69d90d90d90.minX7eWidth}}|||||||||||* UIView:0x7f88a8f3cc00||||||||||||* UIView:0x7f88a8e618d0||||||||||||*UIImageView:0x7f88a8e5ba10||||||||||||* UIView:0x7f88a8f3cd70||||||||||||*UIImageView:0x7f88a8e58e10||||||||||||*UIImageView:0x7f88a8e5e7a0||||||||||||* UIView:0x7f88a8f3cee0|||||||||||* UIView:0x7f88a8f3dc70||||||||||||* UIView:0x7f88a8e64dd0||||||||||||*UILabel:0x7f88a8e65290'平均流量'||||||||||||*UILabel:0x7f88a8e712d0'177.0 ml/s'||||||||||||*UILabel:0x7f88a8c97150'1299.4'||||||||||||* UIView:0x7f88a8f3dde0||||||||||||*UILabel:0x7f88a8f3df50'最大流量'||||||||||||*UILabel:0x7f88a8cbfdb0'371.6 ml/s'||||||||||||*UILabel:0x7f88a8cc0230'873.5'||||||||||||* UIView:0x7f88a8f3e2a0||||||||||||*UILabel:0x7f88a8f3e410'总音量'||||||||||||*UILabel:0x7f88a8cc0f20'371.6 ml'||||||||||||* UIView:0x7f88a8f3e870||||||||||||*UILabel:0x7f88a8f3ea00'时间最大.流动'||||||||||||*UILabel:0x7f88a8cc0ac0'3.6 s'||||||||||||* UIView:0x7f88a8f3ee10||||||||||||*UILabel:0x7f88a8f3efa0'流动时间'||||||||||||*UILabel:0x7f88a8cbf980'2.1 s'||||||||||||* UIView:0x7f88a8f3f3e0||||||||||||*UILabel:0x7f88a8f3f570'无效时间'||||||||||||*UILabel:0x7f88a8cc17e0'3.5 s'||||||||||||* UIView:0x7f88a8f3f9a0||||||||||||*UILabel:0x7f88a8f3fb30'无效延迟'||||||||||||*UILabel:0x7f88a8cc1380'1.0 s'||||||||||||* UIView:0x7f88a8e65000||||||||||||*UIButton:0x7f88a8e52f20'显示'||||||||||||* UIImageView:0x7f88a8e6e1d0||||||||||||*UIButton:0x7f88a8e52c90'发送'||||||||||||*UIImageView:0x7f88a8e61bb0||||||||||||*UIButton:0x7f88a8e528e0'删除'||||||||||||*UIImageView:0x7f88a8e6b3f0||||||||||||* UIView:0x7f88a8f3ff60|||||||||*UIActivityIndicatorView:0x7f88a8cba080||||||||||UIImageView:0x7f88a8cba700|||||||||*_UILayoutGuide:0x7f88a8cc3150|||||||||*_UILayoutGuide:0x7f88a8cc3b10|||||||UIView:0x7f88a8f339c0||UINavigationBar:0x7f88a8c96810|||_UINavigationBarBackground:0x7f88a8e45c00||||UIImageView:0x7f88a8e46410|||UINavigationItemView:0x7f88a8c97520'App'||||UILabel:0x7f88a8c97cc0'App'|||UINavigationButton:0x7f88a8e3e850||||UIImageView:0x7f88a8e445b0|||_UINavigationBarBackIndicatorView:0x7f88a8f2b530传奇:* - 使用自动布局进行布局+ - 手动布局，但在布局引擎中表示，因为 translatesAutoresizingMaskIntoConstraints = YES• - 布局引擎主机然后我暂停了执行 并且我使用命令更改了有问题的视图的背景颜色(将 0x7f88a8cc2050 替换为您对象的内存地址当然)...
Obj-C
expr ((UIView *)0x7f88a8cc2050).backgroundColor = [UIColor redColor]Swift 3.0
expr -l Swift -- 导入 UIKitexpr -l Swift -- unsafeBitCast(0x7f88a8cc2050, to: UIView.self).backgroundColor = UIColor.red...结果太棒了！
简直太棒了！希望有帮助.
I'm seeing an error appear in my debugger log:
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x191f0920 H:[MPKnockoutButton:0x17a876b0]-(34)-[MPDetailSlider:0x17a8bc50](LTR)>
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.
How do I trap on that call? It does not appear anywhere in my code.
解决方案
This post helped me A LOT!
I added UIViewAlertForUnsatisfiableConstraints symbolic breakpoint with suggested action:
Obj-C project
po [[UIWindow keyWindow] _autolayoutTrace]
Swift project
expr -l objc++ -O -- [[UIWindow keyWindow] _autolayoutTrace]
With this hint, the log became more detailed, and It was easier for me identify which view had the constraint broken.
UIWindow:0x7f88a8e4a4a0
| UILayoutContainerView:0x7f88a8f23b70
| | UINavigationTransitionView:0x7f88a8ca1970
| | | UIViewControllerWrapperView:0x7f88a8f2aab0
| | | | •UIView:0x7f88a8ca2880
| | | | | *UIView:0x7f88a8ca2a10
| | | | | | *UIButton:0x7f88a8c98820'Archived'
| | | | | | | UIButtonLabel:0x7f88a8cb0e30'Archived'
| | | | | | *UIButton:0x7f88a8ca22d0'Download'
| | | | | | | UIButtonLabel:0x7f88a8cb04e0'Download'
| | | | | | *UIButton:0x7f88a8ca1580'Deleted'
| | | | | | | UIButtonLabel:0x7f88a8caf100'Deleted'
| | | | | *UIView:0x7f88a8ca33e0
| | | | | *_UILayoutGuide:0x7f88a8ca35b0
| | | | | *_UILayoutGuide:0x7f88a8ca4090
| | | | | _UIPageViewControllerContentView:0x7f88a8f1a390
| | | | | | _UIQueuingScrollView:0x7f88aa031c00
| | | | | | | UIView:0x7f88a8f38070
| | | | | | | UIView:0x7f88a8f381e0
| | | | | | | | •UIView:0x7f88a8f39fa0, MISSING HOST CONSTRAINTS
| | | | | | | | | *UIButton:0x7f88a8cb9bf0'Retrieve data'- AMBIGUOUS LAYOUT for UIButton:0x7f88a8cb9bf0'Retrieve data'.minX{id: 170}, UIButton:0x7f88a8cb9bf0'Retrieve data'.minY{id: 171}
| | | | | | | | | *UIImageView:0x7f88a8f3ad80- AMBIGUOUS LAYOUT for UIImageView:0x7f88a8f3ad80.minX{id: 172}, UIImageView:0x7f88a8f3ad80.minY{id: 173}
| | | | | | | | | *App.RecordInfoView:0x7f88a8cbe530- AMBIGUOUS LAYOUT for App.RecordInfoView:0x7f88a8cbe530.minX{id: 174}, App.RecordInfoView:0x7f88a8cbe530.minY{id: 175}, App.RecordInfoView:0x7f88a8cbe530.Width{id: 176}, App.RecordInfoView:0x7f88a8cbe530.Height{id: 177}
| | | | | | | | | | +UIView:0x7f88a8cc1d30- AMBIGUOUS LAYOUT for UIView:0x7f88a8cc1d30.minX{id: 178}, UIView:0x7f88a8cc1d30.minY{id: 179}, UIView:0x7f88a8cc1d30.Width{id: 180}, UIView:0x7f88a8cc1d30.Height{id: 181}
| | | | | | | | | | | *UIView:0x7f88a8cc1ec0- AMBIGUOUS LAYOUT for UIView:0x7f88a8cc1ec0.minX{id: 153}, UIView:0x7f88a8cc1ec0.minY{id: 151}, UIView:0x7f88a8cc1ec0.Width{id: 154}, UIView:0x7f88a8cc1ec0.Height{id: 165}
| | | | | | | | | | | | *UIView:0x7f88a8e68e10- AMBIGUOUS LAYOUT for UIView:0x7f88a8e68e10.minX{id: 155}, UIView:0x7f88a8e68e10.minY{id: 150}, UIView:0x7f88a8e68e10.Width{id: 156}
| | | | | | | | | | | | *UIImageView:0x7f88a8e65de0- AMBIGUOUS LAYOUT for UIImageView:0x7f88a8e65de0.minX{id: 159}, UIImageView:0x7f88a8e65de0.minY{id: 182}
| | | | | | | | | | | | *UILabel:0x7f88a8e69080'8-6-2015'- AMBIGUOUS LAYOUT for UILabel:0x7f88a8e69080'8-6-2015'.minX{id: 183}, UILabel:0x7f88a8e69080'8-6-2015'.minY{id: 184}, UILabel:0x7f88a8e69080'8-6-2015'.Width{id: 185}
| | | | | | | | | | | | *UILabel:0x7f88a8cc0690'16:34'- AMBIGUOUS LAYOUT for UILabel:0x7f88a8cc0690'16:34'.minX{id: 186}, UILabel:0x7f88a8cc0690'16:34'.minY{id: 187}, UILabel:0x7f88a8cc0690'16:34'.Width{id: 188}, UILabel:0x7f88a8cc0690'16:34'.Height{id: 189}
| | | | | | | | | | | | *UIView:0x7f88a8cc2050- AMBIGUOUS LAYOUT for UIView:0x7f88a8cc2050.minX{id: 161}, UIView:0x7f88a8cc2050.minY{id: 166}, UIView:0x7f88a8cc2050.Width{id: 163}
| | | | | | | | | | | | *UIImageView:0x7f88a8e69d90- AMBIGUOUS LAYOUT for UIImageView:0x7f88a8e69d90.minX{id: 190}, UIImageView:0x7f88a8e69d90.minY{id: 191}, UIImageView:0x7f88a8e69d90.Width{id: 192}, UIImageView:0x7f88a8e69d90.Height{id: 193}
| | | | | | | | | | | *UIView:0x7f88a8f3cc00
| | | | | | | | | | | | *UIView:0x7f88a8e618d0
| | | | | | | | | | | | *UIImageView:0x7f88a8e5ba10
| | | | | | | | | | | | *UIView:0x7f88a8f3cd70
| | | | | | | | | | | | *UIImageView:0x7f88a8e58e10
| | | | | | | | | | | | *UIImageView:0x7f88a8e5e7a0
| | | | | | | | | | | | *UIView:0x7f88a8f3cee0
| | | | | | | | | | | *UIView:0x7f88a8f3dc70
| | | | | | | | | | | | *UIView:0x7f88a8e64dd0
| | | | | | | | | | | | *UILabel:0x7f88a8e65290'Average flow rate'
| | | | | | | | | | | | *UILabel:0x7f88a8e712d0'177.0 ml/s'
| | | | | | | | | | | | *UILabel:0x7f88a8c97150'1299.4'
| | | | | | | | | | | | *UIView:0x7f88a8f3dde0
| | | | | | | | | | | | *UILabel:0x7f88a8f3df50'Maximum flow rate'
| | | | | | | | | | | | *UILabel:0x7f88a8cbfdb0'371.6 ml/s'
| | | | | | | | | | | | *UILabel:0x7f88a8cc0230'873.5'
| | | | | | | | | | | | *UIView:0x7f88a8f3e2a0
| | | | | | | | | | | | *UILabel:0x7f88a8f3e410'Total volume'
| | | | | | | | | | | | *UILabel:0x7f88a8cc0f20'371.6 ml'
| | | | | | | | | | | | *UIView:0x7f88a8f3e870
| | | | | | | | | | | | *UILabel:0x7f88a8f3ea00'Time do max. flow'
| | | | | | | | | | | | *UILabel:0x7f88a8cc0ac0'3.6 s'
| | | | | | | | | | | | *UIView:0x7f88a8f3ee10
| | | | | | | | | | | | *UILabel:0x7f88a8f3efa0'Flow time'
| | | | | | | | | | | | *UILabel:0x7f88a8cbf980'2.1 s'
| | | | | | | | | | | | *UIView:0x7f88a8f3f3e0
| | | | | | | | | | | | *UILabel:0x7f88a8f3f570'Voiding time'
| | | | | | | | | | | | *UILabel:0x7f88a8cc17e0'3.5 s'
| | | | | | | | | | | | *UIView:0x7f88a8f3f9a0
| | | | | | | | | | | | *UILabel:0x7f88a8f3fb30'Voiding delay'
| | | | | | | | | | | | *UILabel:0x7f88a8cc1380'1.0 s'
| | | | | | | | | | | | *UIView:0x7f88a8e65000
| | | | | | | | | | | | *UIButton:0x7f88a8e52f20'Show'
| | | | | | | | | | | | *UIImageView:0x7f88a8e6e1d0
| | | | | | | | | | | | *UIButton:0x7f88a8e52c90'Send'
| | | | | | | | | | | | *UIImageView:0x7f88a8e61bb0
| | | | | | | | | | | | *UIButton:0x7f88a8e528e0'Delete'
| | | | | | | | | | | | *UIImageView:0x7f88a8e6b3f0
| | | | | | | | | | | | *UIView:0x7f88a8f3ff60
| | | | | | | | | *UIActivityIndicatorView:0x7f88a8cba080
| | | | | | | | | | UIImageView:0x7f88a8cba700
| | | | | | | | | *_UILayoutGuide:0x7f88a8cc3150
| | | | | | | | | *_UILayoutGuide:0x7f88a8cc3b10
| | | | | | | UIView:0x7f88a8f339c0
| | UINavigationBar:0x7f88a8c96810
| | | _UINavigationBarBackground:0x7f88a8e45c00
| | | | UIImageView:0x7f88a8e46410
| | | UINavigationItemView:0x7f88a8c97520'App'
| | | | UILabel:0x7f88a8c97cc0'App'
| | | UINavigationButton:0x7f88a8e3e850
| | | | UIImageView:0x7f88a8e445b0
| | | _UINavigationBarBackIndicatorView:0x7f88a8f2b530
Legend:
* - is laid out with auto layout
+ - is laid out manually, but is represented in the layout engine because translatesAutoresizingMaskIntoConstraints = YES
• - layout engine host
Then I paused execution and I changed problematic view's background color with the command (replacing 0x7f88a8cc2050 with the memory address of your object of course)...
Obj-C
expr ((UIView *)0x7f88a8cc2050).backgroundColor = [UIColor redColor]
Swift 3.0
expr -l Swift -- import UIKit
expr -l Swift -- unsafeBitCast(0x7f88a8cc2050, to: UIView.self).backgroundColor = UIColor.red
... and the result It was awesome!
Simply amazing! Hope It helps.
这篇关于如何捕获 UIViewAlertForUnsatisfiableConstraints?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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