dispatch_group_t group = dispatch_group_create();
dispatch_queue_t queue = dispatch_queue_create("queue", DISPATCH_QUEUE_SERIAL);
dispatch_group_enter(group);
dispatch_group_async(group, queue, ^{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSLog(@"任務1");
dispatch_group_leave(group);
});
});
dispatch_group_enter(group);
dispatch_group_async(group, queue, ^{
NSLog(@"任務2");
dispatch_group_leave(group);
});
dispatch_group_enter(group);
dispatch_group_async(group, queue, ^{
NSLog(@"任務3");
dispatch_group_leave(group);
});
dispatch_group_notify(group, queue, ^{
NSLog(@"完成");
});
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