dispatch_group_async

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

    dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group, queue, ^{

        [NSThread sleepForTimeInterval:1];

        [self group1];

    });

    dispatch_group_async(group, queue, ^{

        [NSThread sleepForTimeInterval:5];

        [self group2];

    });

    dispatch_group_async(group, queue, ^{

        [NSThread sleepForTimeInterval:10];

        [self group3];

    });

    dispatch_group_notify(group, dispatch_get_main_queue(), ^{

        NSLog(@"updateUi");

    });

    dispatch_release(group);

}
- (void)group1

{

    NSLog(@"%s", __FUNCTION__);

}
- (void)group2

{

    NSLog(@"%s",__FUNCTION__);

}
- (void)group3

{

    NSLog(@"%s",__FUNCTION__);

}

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