iOS系统中的各种通知

一、键盘 

1、UIKeyboardWillShowNotification-将要弹出键盘 

2、UIKeyboardDidShowNotification-显示键盘 

3、UIKeyboardWillHideNotification-将要隐藏键盘 

4、UIKeyboardDidHideNotification-键盘已经隐藏 

5、UIKeyboardWillChangeFrameNotification-键盘将要改变frame 

6、UIKeyboardDidChangeFrameNotification-键盘已经改变frame

二、窗口 

1、UIWindowDidBecomeVisibleNotification-窗口可见 

2、UIWindowDidBecomeHiddenNotification-窗口隐藏 

3、UIWindowDidBecomeKeyNotification 

4、UIWindowDidResignKeyNotification 

三、程序消息 

1、UIApplicationDidBecomeActiveNotification-程序从后台激活 

2、UIApplicationDidChangeStatusBarFrameNotification-状态栏frame改变 

3、UIApplicationDidChangeStatusBarOrientationNotification-状态栏方向改变 

4、UIApplicationDidEnterBackgroundNotification-进入后台 

5、UIApplicationDidFinishLaunchingNotification-程序加载完成 

6、UIApplicationDidReceiveMemoryWarningNotification-内存警告 

7、UIApplicationProtectedDataDidBecomeAvailable 

8、UIApplicationProtectedDataWillBecomeUnavailable 

9、UIApplicationSignificantTimeChangeNotification 重要的时间变化（新的一天开始或时区变化） 

10、UIApplicationWillChangeStatusBarOrientationNotification-将要改变状态栏方向 

11、UIApplicationWillChangeStatusBarFrameNotification-将要改变状态栏frame 

12、UIApplicationWillEnterForegroundNotification 

13、UIApplicationWillResignActiveNotification 

14、UIApplicationWillTerminateNotification

四、电池、方向、传感器 

1、UIDeviceBatteryLevelDidChangeNotification //电池电量 

2、UIDeviceBatteryStateDidChangeNotification //电池状态 

3、UIDeviceOrientationDidChangeNotification //方向 

4、UIDeviceProximityStateDidChangeNotification //近距离传感器

五、音视频 

1、MPMediaLibraryDidChangeNotification 

2、MPMusicPlayerControllerPlaybackStateDidChangeNotification 

3、MPMusicPlayerControllerNowPlayingItemDidChangeNotification 

4、MPMusicPlayerControllerVolumeDidChangeNotification

六、其他 

1、NSUserDefaultsDidChangeNotification 用户默认设置变化 

2 NSCurrentLocaleDidChangeNotification 本地化语言变化

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