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Attribute Unavailable: Defines Presentation Context is not available prior to Xc

 
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   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.
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