NSInteger noc=0;
NSTimeInterval period = 60.0; //設置時間間隔
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(zhí)行
dispatch_source_set_event_handler(_timer, ^{
if (noc==1) { dispatch_source_cancel(_timer);}//取消定時
//在這里執(zhí)行事件
[self getNowDate];
});
dispatch_resume(_timer);
