App runs in the background

There are three states of the app:

1. Death status (app not open);

2. Foreground running status (open state);

3. Background pause status (stop all animations, timers, multi-media networking, etc.)

4. Background running status (background running); ---------

Need to be set in Appdelegate:

1. Set in-(void) Applicationdidenterbackground: (UIApplication *) Application Method:

　　

-(void) Applicationdidenterbackground: (uiapplication *) Application {

It is uncertain how long it will take to apply for background running to the operating system.

[Application beginbackgroundtaskwithexpirationhandler:^{

}];

so: If you want to keep the program running in the background, you need to set it up:  

The ability to apply for background runs to the operating system, how long it can last, is uncertain

Uibackgroundtaskidentifier task = [Application beginbackgroundtaskwithexpirationhandler:^{

When the background run time for the application has ended (expired), the block is called

Finish the mission.

[Application Endbackgroundtask:task];

}];

Setting the background mode in INFO.PLST: Required background modes = = APP plays audio or streams audio/video using AirPlay

//engage in a 0kb MP3 file with no sound, Loop Playback

There are only 3 types of previous background modes

Keep your network connected

Multimedia applications

VOIP: Internet telephony

}

App runs in the background