1 - (void)applicationDidEnterBackgtound
2 {
3 UIApplication *app = [UIApplication sharedApplication];
4 __block UIBackgroundTaskIdentifier taskId;
5
6 taskId = [app beginBackgroundTaskWithExpirationHandler:^{
7 NSLog(@"%@",NSStringFromSelector(_cmd));
8 [app endBackgroundTask:taskId];
9 }];
10
11 if (taskId == UIBackgroundTaskInvalid) {
12 return;
13 }
14
15 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
16 //做一些额外的操作
17 [app endBackgroundTask:taskId];
18 });
19 }
