nstimer *timer = [nstimer scheduledtimerwithtimeinterval:1.0 target:self selector:@selector(action:) userinfo:nil repeats:no];[timer invalidate];self
.displaylink = [cadisplaylink displaylinkwithtarget:self selector:@selector(handledisplaylink:)];
[self
.displaylink addtorunloop:[nsrunloop currentrunloop] formode:nsdefaultrunloopmode];
[self
.displaylink invalidate];
self
.displaylink = nil;
**當把cadisplaylink物件add到runloop中後，selector就能被週期性呼叫，類似於重複的nstimer被啟動了；執行invalidate操作時，cadisplaylink物件就會從runloop中移除，selector呼叫也隨即停止，類似於nstimer的invalidate方法。**
double delayinseconds = 2.0;
dispatch_time_t poptime = dispatch_time(dispatch_time_now, delayinseconds * nsec_per_sec);
dispatch_after(poptime, dispatch_get_main_queue(), ^(void));
nstimeinterval period = 1.0; //設定時間間隔
dispatch_queue_t
queue = dispatch_get_global_queue(dispatch_queue_priority_default, 0);
dispatch_source_t _timer = dispatch_source_create(dispatch_source_type_timer, 0, 0, queue);
dispatch_source_set_timer(_timer, dispatch_walltime(null, 0), period * nsec_per_sec, 0); //每秒執行
dispatch_source_set_event_handler(_timer, ^);
dispatch_resume(_timer);
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