The app was perfectly fine working in iOS5 in landscape orientation. However in iOS6, it started to use portrait orientation in all view controllers. The methods shouldAutorotateToInterfaceOrientation are not called anymore. I read the The app was perfectly fine working in iOS5 in l
阅读背景：
iOS6：我们是否必须在App委托中设置rootViewController才能支持不同的方向？
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