dispatch_async(dispatch_get_main_queue, ^(void) { }); dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) { }); static dispatch_once_t dipatch_once; static NSOjbect *obj; dipatch_once(&dipatch_once, ^(void) { obj = [[NSOjbect alloc] init]; }); dipatch_time_t time_token = dispatch_time(DISPATCH_TIME_NOW, 2 * NSEC_PER_SECOND); dispatch_after(time_token, dispatch_get_main_queue(), ^(void) { }); //组发配 dipatch_queue_t queue = dispatch_get_global_qeueu(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_group_t group = dispatch_group_create(); dipatch_group_async(group, queue, ^(void) { [NSThead sleepForTimeInterval:1]; NSLog(@“zu'ren'wu”组任务1); }); dipatch_group_async(group, queue, ^(void) { [NSThead sleepForTimeInterval:1]; NSLog(@“zu'ren'wu”组任务2); }); dispatch_group_notify(group, dispatch_get_main_queue(), ^(void) { NSLog(“Update UI”);; }); dispatch_release(group);
练习二:
dispatch_queue_t serial_queue_t = dispatch_queue_create("Kg.kinggen.CloudBuyer.myQueue", DISPATCH_QUEUE_SERIAL); dispatch_queue_t concurrent_queue_t = dispatch_queue_create("Kg.kinggen.CloudBuyer.concurrentQueue", DISPATCH_QUEUE_CONCURRENT); dispatch_group_t group_t = dispatch_group_create(); dispatch_group_async(group_t, serial_queue_t, ^{ NSLog(@""); }); dispatch_group_notify(group_t, concurrent_queue_t, ^(void) { NSLog(@""); }); dispatch_queue_t global_queue_t = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_queue_t main_queue_t = dispatch_get_main_queue();