IOS 7 更改导航栏文字到白色

To hide status bar in any viewcontroller:

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-(BOOL) prefersStatusBarHidden {     return YES; }

 To change the status bar text to white color.

set UIViewControllerBasedStatusBarAppearance to NO on .plist file first, then added this method:

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-(UIStatusBarStyle)preferredStatusBarStyle{     return UIStatusBarStyleLightContent; }