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pietrorea/gist:089e308b4e9b46ded3ae

Last active August 29, 2015 14:05
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Auto Layout ambiguous constraints debugging tool
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gistfile1.m
//In UIViewController subclass
@interface UIWindow (AutoLayoutDebug)
+ (UIWindow *)keyWindow;
- (NSString *)_autolayoutTrace;
@end
- (void)didRotateFromInterfaceOrientation: (UIInterfaceOrientation)fromInterfaceOrientation
{
[super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
NSLog(@"%@", [[UIWindow keyWindow] _autolayoutTrace]);
}
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From iOS 6 by Tutorials chapter by Matthijs Hollemans

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*<_UILayoutGuide:0x8e992f0> - AMBIGUOUS LAYOUT

^ Ignore if you see that on an iOS 7 simulator. It seems to be a bug with _autolayoutTrace.

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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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