调度组
1. despatch_group_t group = dispatch_group_create();
2. dispatch_queue_t queue = dispatch_queue_get_globalQuequ();
3. dispatch_enter_group(group);
4. dispatch_group_async(quequ
NSLog(@"耗时操作1");
dispatch_leave_group(group);
);
5. dispatch_enter_group(group);
dispatch_group_async(quequ
NSLog(@"耗时操作2");
dispatch_leave_group(group);
);
6. dispatch_notify(
);
https://blog.csdn.net/u010105969/article/details/69668841