iOS的一些常见系统Notification(系统消息)

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