在xcode 6.4 中设置 ios应用的状态栏的风格

In your Info.plist you need to define View controller-based status bar appearance to any value.

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If you define it YES then you should override preferredStatusBarStyle function in each view controller.

If you define it NO then you can set style in AppDelegate using

NSLog("设置顶部状态栏的状态")
UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: false)