dispatch_group_async
场景：在n个耗时并发任务都完成后，再去执行接下来的任务。比如，在n个网络请求完成后去刷新UI页面。
dispatch_queue_t concurrentQueue = dispatch_queue_create("test1", DISPATCH_QUEUE_CONCURRENT);
dispatch_group_t group = dispatch_group_create();
for (NSInteger i = 0; i < 10; i++) {
dispatch_group_async(group, concurrentQueue, ^{
sleep(1);
NSLog(@"%zd:网络请求",i);
});
}
dispatch_group_notify(group, dispatch_get_main_queue(), ^{
NSLog(@"刷新页面");
});
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