- [NSTimer scheduledTimerWithTimeInterval:3.0f target:self selector:@selector(delayMethod) userInfo:nil repeats:NO];//此方式要求必须在主线程中执行,否则无效。 是一种非阻塞的执行方式, 可以通过NSTimer类的- (void)invalidate;取消执行。
- dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
-
- self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
-
- //开始时间
- dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, 3.0 * NSEC_PER_SEC);
-
- //间隔时间
- uint64_t interval = 2.0 * NSEC_PER_SEC;
-
- dispatch_source_set_timer(self.timer, start, interval, 0);
-
- //设置回调
- dispatch_source_set_event_handler(self.timer, ^{
- [self delayMethod];
- dispatch_suspend(self.timer);
- });
-
- //启动timer
- dispatch_resume(self.timer);