iOS App response Background,foreground event implementation

1 implementation via Appdelegate

App Entry Background Event method

-(void) Applicationdidenterbackground: (uiapplication *) application

App entry to the foreground event method

-(void) Applicationwillenterforeground: (uiapplication *) application

The 2UIViewController class is implemented by listening for notifications of background, foreground events

Example

-(void) Viewwillappear: (BOOL) animated{

[[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (appwillenterforegroundnotification) name : Uiapplicationwillenterforegroundnotification Object:nil];

}

-(void) appwillenterforegroundnotification{

NSLog (@"trigger event when would enter foreground.");

}

-(void) Viewdiddisappear: (BOOL) animated{

[[Nsnotificationcenter Defaultcenter] removeobserver:self];

}

Note: The Viewdidunload method expires after IOS6 in the Uiviewcontroller class

iOS App response Background,foreground event implementation