IOS中怎么让线程在主线程上执行100次

Question

如题，请大神指教

Answer 1

    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        
        for (int i = 0; i < 100; ++i )
        {
            dispatch_async(dispatch_get_main_queue(), ^{
                NSLog(@"this printf in main thread.");
            });
            
            usleep(10);
        }
    });