1 -(void)startTime{
2 __block int timeout=30; //倒计时时间
3 dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
4 dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);
5 dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
6 dispatch_source_set_event_handler(_timer, ^{
7 if(timeout<=0){ //倒计时结束，关闭
8 dispatch_source_cancel(_timer);
9 dispatch_async(dispatch_get_main_queue(), ^{
10 //设置界面的按钮显示 根据自己需求设置
11 [l_timeButton setTitle:@"发送验证码" forState:UIControlStateNormal];
12 l_timeButton.userInteractionEnabled = YES;
13 });
14 }else{
15 // int minutes = timeout / 60;
16 int seconds = timeout % 60;
17 NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
18 dispatch_async(dispatch_get_main_queue(), ^{
19 //设置界面的按钮显示 根据自己需求设置
20 NSLog(@"____%@",strTime);
21 [l_timeButton setTitle:[NSString stringWithFormat:@"%@秒后重新发送",strTime] forState:UIControlStateNormal];
22 l_timeButton.userInteractionEnabled = NO;
23
24 });
25 timeout--;
26
27 }
28 });
29 dispatch_resume(_timer);
30
31 }
