iOS 系统消息通知

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、窗体

1、UIWindowDidBecomeVisibleNotification-窗体可见

2、UIWindowDidBecomeHiddenNotification-窗体隐藏

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-程序载入完毕

6、UIApplicationDidReceiveMemoryWarningNotification-内存警告

7、UIApplicationProtectedDataDidBecomeAvailable

8、UIApplicationProtectedDataWillBecomeUnavailable

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

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、其它 

1、NSUserDefaultsDidChangeNotification 用户默认设置变化

2   NSCurrentLocaleDidChangeNotification 本地化语言变化