//获得队列
dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
//创建一个定时器
self.time = 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)(3.0 * NSEC_PER_SEC));
//设置时间间隔
uint64_t interval = (uint64_t)(15.0* NSEC_PER_SEC);
//设置定时器
dispatch_source_set_timer(self.time, start, interval, 0);
//设置回调
WEAKSELF
dispatch_source_set_event_handler(self.time, ^{
[weakSelf requestCurrentLoacation];
if (isAgain == NO) { //取消定时器
dispatch_cancel(self.time);
}
});
//启动定时器 (默认是关闭的)
dispatch_resume(self.time);
@property (nonatomic, strong)dispatch_source_t time;
