Keep running the iOS app on background, collecting data from accelerator and send it to server

问题

I've developed an app, for reading the Accelerator data, store them locally and send them frequently with a specific interval to a server. The app must work on background, but after a while ( 3 minutes sometime ) it stops sending like it's closed.

Is it possible to keep the app alive all the time, running and sending data to a server on background? how ?

The app is supposed to keep working for weeks.

Thanks guys.

回答1:

iOS will allow you 3 minutes of execution in background. 

https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html

If you want to keep running there are various "workarounds" but not a stable solution.You can initiate background tasks and then manage them

 -(void)applicationDidEnterBackground:(UIApplication *)application

{ 
  UIApplication *app = [UIApplication sharedApplication];

    UIBackgroundTaskIdentifier bgTask = 0;

    backgroundTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self              selector:@selector(backgroundTask) userInfo:nil repeats:YES];

    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
   [app endBackgroundTask:bgTask];
 }];

}

来源：https://stackoverflow.com/questions/27610170/keep-running-the-ios-app-on-background-collecting-data-from-accelerator-and-sen