访问 UIViewcontroller.traitCollection 编译但使我的应用程序崩溃 [英] Accessing UIViewcontroller.traitCollection compiles but crashes my app

问题描述

我的故事板是在 xcode6 中构建的，并且正在使用新的基于约束的布局.我的应用程序以两种配置运行，wRegular hRegular 和 wCompact hAny.每当我尝试在代码中访问 traitCollection 时，都会收到以下错误:

My storyboard is build in xcode6 and is using the new constraint based layouts. My app runs in two configurations, wRegular hRegular and wCompact hAny. Any time I try to access the traitCollection in code I get the following error:

[MYUIControllerName traitCollection]: unrecognized selector sent to instance.

我也尝试过实现以下功能，但从未被调用.

I have also tried implementing the following function, but it never gets called.

-(void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator

推荐答案

我认为 size classes 不起作用是不对的 <iOS 8. https://developer.apple.com/library/ios/recipes/xcode_help-IB_adaptive_sizes/chapters/DeployingSizeClassesonEarlieriOSVersions.html#//apple_ref/doc/uid/TP40014436-CH13-SW1

I don't think it's exactly right that size classes don't work < iOS 8. https://developer.apple.com/library/ios/recipes/xcode_help-IB_adaptive_sizes/chapters/DeployingSizeClassesonEarlieriOSVersions.html#//apple_ref/doc/uid/TP40014436-CH13-SW1

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