#pragma mark -
#pragma mark ==============定时器的开始和取消==============
- (void)startStopData:(BOOL)isStart {
if (isStart) {
self.count =0;
//获得队列
dispatch_queue_t queue =dispatch_get_global_queue(0,0);
//创建一个定时器
self.timer =dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,0,0, queue);
//设置开始时间
dispatch_time_t start =dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC));
//设置时间间隔
uint64_t interval = (uint64_t)(3.0*NSEC_PER_SEC);
//设置定时器
dispatch_source_set_timer(self.timer, start, interval,0);
//设置回调
dispatch_source_set_event_handler(self.timer, ^{
//在这里执行事件
self.count +=3;
if (self.count ==60) {
self.count =0;
[selfgetData];
}
});
//由于定时器默认是暂停的所以我们启动一下
//启动定时器
dispatch_resume(self.timer);
}else {
if (self.timer) {
dispatch_cancel(self.timer);
self.timer =nil;
self.count =0;
}
}
}
这是使用GCD创建的一个定时器的试用样例
