//每隔一分钟执行一次打印
// GCD定时器
static dispatch_source_t _timer;
//设置时间间隔
NSTimeInterval period = 60.f;
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
_timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
// 第一次不会立刻执行，会等到间隔时间后再执行
dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, period * NSEC_PER_SEC);
dispatch_source_set_timer(_timer, start, period * NSEC_PER_SEC, 0);
// 第一次会立刻执行，然后再间隔执行
dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), period * NSEC_PER_SEC, 0);
// 事件回调
dispatch_source_set_event_handler(_timer, ^{
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Count");
//网络请求 doSomeThing...
});
});
// 开启定时器
if (_timer) {
dispatch_resume(_timer);
}
// 关闭定时器
if (_timer) {
dispatch_source_cancel(_timer);
_timer = nil;
}
dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, period * NSEC_PER_SEC);
dispatch_source_set_timer(_timer, start, period * NSEC_PER_SEC, 0);
dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), period * NSEC_PER_SEC, 0);
dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, 10.0 * NSEC_PER_SEC);
dispatch_after(time, dispatch_get_main_queue(), ^{
NSLog(@"1111111111");
});
附：我的博客地址
