iphone - 我们如何让我们的应用程序在屏幕锁定时运行

Question

我的设备锁定有问题。如果我的应用程序正在运行并且设备被锁定，那么我的应用程序也无法运行。我希望我的应用程序即使在我的设备被锁定的情况下也能正常运行。我的代码如下:

- (void)applicationDidEnterBackground:(UIApplication *)application
{
 [[UIApplication sharedApplication] setIdleTimerDisabled:NO];

 background = YES;

 UIApplication  *app = [UIApplication sharedApplication];

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

 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  if (background) {
   StressFreeAlarmViewController *alarmController=[[StressFreeAlarmViewController alloc] initWithNibName:@"StressFreeAlarmViewController" bundle:nil];

   [alarmController setTimer:[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updatingApp) userInfo:nil repeats:YES]];

   background=NO;
  }
 });

}


- (void)applicationDidBecomeActive:(UIApplication *)application
{
 // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
 background = NO;
}

Answer 1

注释掉这一行

 [app endBackgroundTask:bgTask];
 bgTask = UIBackgroundTaskInvalid;


here


 UIApplication  *app = [UIApplication sharedApplication];

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