iOS 多线程之间有依赖时的处理方式
dispatch_queue_t queue = dispatch_queue_create("queue", DISPATCH_QUEUE_CONCURRENT);
dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group, queue, ^{
dispatch_group_enter(group);
NSLog(@"first API got data");
});
dispatch_group_async(group, queue, ^{
dispatch_group_enter(group);
NSLog(@"second API got data");
});
dispatch_group_leave(group);
dispatch_group_leave(group);
dispatch_group_notify(group, dispatch_get_main_queue(), ^{
NSLog(@"UI refresh now");
});
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