iOS program quits

program does not run in the background, the method of outright exit:

Plist file Add application does not run in background set to Yes

Principle: After the program cut into the background, every 10 minutes to perform an action to wake up the program, thus ensuring that it has been running in the background.

1. Add uibackgroundmodes key value in Info.plist

Let the system know that your application should be awakened at the right time

2, in -(void) Applicationdidenterbackground: (uiapplication *) application Execute the following code in the method in the background execution

[[UIApplication sharedapplication]setkeepalivetimeout:600                                                  handler:^{                                                      //Executed code                                                    }];

iOS program quits