// 支付倒计时
- (void)secondsCountDown:(UILabel *)label {
__block int timeout = 900;
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), 1.0*NSEC_PER_SEC, 0);//每秒执行
dispatch_source_set_event_handler(_timer, ^{
if (timeout<=0) {
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
// 隐藏密码输入界面，禁用支付按钮
[MBProgressHUD showMessage:@"付款超时，请返回重新选择座位"];
});
}else {
int minutes = timeout/60;
int seconds = timeout%60;
NSString *strTime = [NSString stringWithFormat:@"%d 分 %d 秒", minutes, seconds];
dispatch_async(dispatch_get_main_queue(), ^{
label.text = [NSString stringWithFormat:@"请在 %@ 内完成付款，晚了座位就没有了哦",strTime];
});
timeout--;
}
});
dispatch_resume(_timer);
}
参考
