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Auto Layout ambiguous constraints debugging tool
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| //In UIViewController subclass | |
| @interface UIWindow (AutoLayoutDebug) | |
| + (UIWindow *)keyWindow; | |
| - (NSString *)_autolayoutTrace; | |
| @end | |
| - (void)didRotateFromInterfaceOrientation: (UIInterfaceOrientation)fromInterfaceOrientation | |
| { | |
| [super didRotateFromInterfaceOrientation:fromInterfaceOrientation]; | |
| NSLog(@"%@", [[UIWindow keyWindow] _autolayoutTrace]); | |
| } |
*<_UILayoutGuide:0x8e992f0> - AMBIGUOUS LAYOUT
^ Ignore if you see that on an iOS 7 simulator. It seems to be a bug with _autolayoutTrace.
Also, don't submit to the app store with _autolayoutTrace. Wrap around a preprocessor macro (e.g.g #ifdef DEBUG) so that it doesn't make it to the final binary. Otherwise the app may be rejected!
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From iOS 6 by Tutorials chapter by Matthijs Hollemans