objective c 多线程GCD

new_gist_file

dispatch_queue_t serverDelaySimulationThread = dispatch_queue_create("com.xxx.serverDelay", nil);
dispatch_async(serverDelaySimulationThread, ^{
     [NSThread sleepForTimeInterval:10.0];
     dispatch_async(dispatch_get_main_queue(), ^{
            //Your server communication code here
    }); 
});



dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        [NSThread sleepForTimeInterval:5.0];//假装暂停5秒
        dispatch_async(dispatch_get_main_queue(), ^{
            //Your server communication code here
        });
    });