UIApplicationDidEnterBackgroundNotification
UIApplicationWillEnterForegroundNotification
UIApplicationDidFinishLaunchingNotification
UIApplicationDidBecomeActiveNotification
UIApplicationWillResignActiveNotification
UIApplicationDidReceiveMemoryWarningNotification
UIApplicationWillTerminateNotification
UIApplicationSignificantTimeChangeNotification
UIApplicationWillChangeStatusBarOrientationNotification
// userInfo contains NSNumber with new orientation
UIApplicationDidChangeStatusBarOrientationNotification
// userInfo contains NSNumber with old orientation
UIApplicationStatusBarOrientationUserInfoKey
// userInfo dictionary key for status bar orientation
UIApplicationWillChangeStatusBarFrameNotification
// userInfo contains NSValue with new frame
UIApplicationDidChangeStatusBarFrameNotification
// userInfo contains NSValue with old frame
UIApplicationStatusBarFrameUserInfoKey
// userInfo dictionary key for status bar frame
- 后臺下載狀態發生改變時通知（iOS7.0以后可用）
UIApplicationBackgroundRefreshStatusDidChangeNotification
UIApplicationProtectedDataWillBecomeUnavailable
UIApplicationProtectedDataDidBecomeAvailable
UIApplicationUserDidTakeScreenshotNotification
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