dispatch_group_tと非同期処理の終了待機 - Qiita

-(void)hoge { dispatch_group_t group = dispatch_group_create(); dispatch_queue_t queue = dispatch_queue_create("com.dispatch.queue.concurrent", DISPATCH_QUEUE_CONCURRENT); dispatch_group_async(group, queue, ^{ NSLog(@"start 1"); sleep(1); NSLog(@"end 1"); }); dispatch_group_async(group, queue, ^{ NSLog(@"start 2"); sleep(3); NSLog(@"end 2"); }); dispatch_group_async(group, queue, ^{ NSLog(@"start