调度组

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- (void) doSomething {
   
   
    dispatch_group_t  g = dispatch_group_create();
   
    dispatch_queue_t q = dispatch_get_global_queue(0, 0);

 
    dispatch_group_async(g, q, ^{
       
        [NSThread sleepForTimeInterval:2];
       
        NSLog(@"aaa===%@",[NSThread currentThread]);
    });
    dispatch_group_async(g, q, ^{
       
        NSLog(@"bbb===%@",[NSThread currentThread]);
    });
   
    dispatch_group_notify(g, q, ^{
       
        NSLog(@"over");
    });

}

转载于:https://my.oschina.net/venn0126/blog/544359