本文介绍在Xcode4.2中使用TabBarController或NavController时遇到的警告问题及其解决方案。通过取消勾选DefinesContext选项可以消除编译警告。
在xcode4.2的MainWindow.xib中，使用Tab Bar Controller或者Nav Controller时，
编译时候会有如下警告：
Attribute Unavailable: Defines Presentation Context is not available prior to Xcode 4.2
解决办法：
Just uncheck the "Defines Context" checkbox in the attributes inspector. (Double-click on MainWindow.xib, select the navigation controller/Tab Bar Controller, then go to View->Utilities->Attributes Inspector.) That'll get rid of the warnings.
编译时候会有如下警告：
Attribute Unavailable: Defines Presentation Context is not available prior to Xcode 4.2
解决办法：
Just uncheck the "Defines Context" checkbox in the attributes inspector. (Double-click on MainWindow.xib, select the navigation controller/Tab Bar Controller, then go to View->Utilities->Attributes Inspector.) That'll get rid of the warnings.
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