iOS system messages

First, the keyboard
1. Uikeyboardwillshownotification will eject the keyboard
2. uikeyboarddidshownotification Display keyboard
3, Uikeyboardwillhidenotification will hide the keyboard
4, uikeyboarddidhidenotification keyboard has been hidden
5. uikeyboardwillchangeframenotification Keyboard will change frame
6. Uikeyboarddidchangeframenotification Keyboard has changed frame

Second, the window
1, uiwindowdidbecomevisiblenotification window visible
2, uiwindowdidbecomehiddennotification window hidden
3, Uiwindowdidbecomekeynotification
4, Uiwindowdidresignkeynotification
Third, the program message
1, uiapplicationdidbecomeactivenotification program from the background activation
2, uiapplicationdidchangestatusbarframenotification status bar frame change
3, uiapplicationdidchangestatusbarorientationnotification status bar direction change
4, uiapplicationdidenterbackgroundnotification into the backstage
5, uiapplicationdidfinishlaunchingnotification program loading complete
6. Uiapplicationdidreceivememorywarningnotification Memory Warning
7, Uiapplicationprotecteddatadidbecomeavailable
8, Uiapplicationprotecteddatawillbecomeunavailable
9. Uiapplicationsignificanttimechangenotification Important time Changes
10, Uiapplicationwillchangestatusbarorientationnotification will change the status bar direction
11, Uiapplicationwillchangestatusbarframenotification will change the status bar frame
12, Uiapplicationwillenterforegroundnotification
13, Uiapplicationwillresignactivenotification
14, Uiapplicationwillterminatenotification

Iv. battery, direction, sensor
1, uidevicebatteryleveldidchangenotification battery power
2. Uidevicebatterystatedidchangenotification Battery Status
3, Uideviceorientationdidchangenotification direction
4, uideviceproximitystatedidchangenotification near distance sensor

Five, audio and video
1, Mpmedialibrarydidchangenotification
2, Mpmusicplayercontrollerplaybackstatedidchangenotification
3, Mpmusicplayercontrollernowplayingitemdidchangenotification
4, Mpmusicplayercontrollervolumedidchangenotification

Vi. Other
1, nsuserdefaultsdidchangenotification user default settings change
2 nscurrentlocaledidchangenotification Localization language changes

iOS system messages