App enters backstage 10 minutes active Time-B

There are 7 ways iOS allows you to run in the background for a long time:
Audio
Voip
Gps
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When communicating with other accessory hardware
When using Bluetooth for communication
When using Bluetooth to share data
In addition to the above, the program may be set to run for a short period of 10 minutes
Continue running for 10 minutes when the program exits the background
Added in xxappdelegate: Uibackgroundtaskidentifier bgtask;

-(void) Applicationdidenterbackground: (uiapplication *) application{   bgtask = [application beginbackgroundtaskwithexpirationhandler:^{   //10 minutes after the execution here, there should be some cleanup work, such as disconnecting and connecting to the server      //.　　 .　    //stopped or ending the task outright.　　      [application Endbackgroundtask:bgtask];　　   bgtask = Uibackgroundtaskinvalid;　　}];　　if (Bgtask = = uibackgroundtaskinvalid) {   nslog (@ "failed to start background task!");}　　Start the long-running task and return immediately. Dispatch_async (Dispatch_get_global_queue (dispatch_queue_priority_default, 0), ^{   //do the work　　 Associated with the task, preferably in chunks.　　    nstimeinterval timeremain = 0;　　    do{       [nsthread Sleepfortimeinterval:5];         if (bgtask!= uibackgroundtaskinvalid) {           timeremain = [Application BackgroundtimeremAining];　　            nslog (@ "Time Remaining:%f", Timeremain);         }    }while (bgtask!= uibackgroundtaskinvalid && timeremain > 0);
        //If you change to Timeremain > 5*60, the background runs for 5 minutes    //done!    //If it is not 10 minutes, you can also actively close the background task, but this needs to be executed in the main thread, otherwise error    dispatch_async (Dispatch_get_main_queue (), ^{& nbsp      IF (bgtask! = uibackgroundtaskinvalid)        {        &NBS P   //Same as code executed 10 minutes above            //...            // If you don't call Endbackgroundtask, the OS would exit your app.             [Application E　　 Ndbackgroundtask:bgtask];　　            bgtask = Uibackgroundtaskinvalid;　　       }    }); });} -(void) Applicationwillenterforeground: (uiapplication *) application{//If the app is opened in less than 10 minutes, end the background task if (bgtask!= Uibackgroundtaskinvalid) {   [application endbackgroundtask:bgtask];     Bgtask = Uibackgroundtask　　Invalid; }}

In the background, if some code you do not want to execute, you can add the following conditions:

UIApplication *application = [UIApplication sharedApplication];if( application.applicationState == UIApplicationStateBackground) {    return;}

Some apps although we do not allow the notification, but still will pop up the message, it should be set up a timer, to a certain time to let the program run in the background, update the data from the server, and then display it.

App enters backstage 10 minutes active Time-B