UIButton倒计时

/**

*  倒计时按钮

*

*  @paramtimeLine 倒计时总时间

*  @paramtitle    还没倒计时的title

*  @paramsubTitle 倒计时中的子名字，如时、分

*  @parammColor  还没倒计时的颜色

*  @paramcolor    倒计时中的颜色

*/

- (void)startWithTime:(NSInteger)timeLine title:(NSString*)title countDownTitle:(NSString*)subTitle mainColor:(UIColor*)mColor countColor:(UIColor*)color {

    [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];

    __weak typeof(self) weakSelf = self;

    //倒计时时间

    __blockNSIntegertimeOut = timeLine;

    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);

    //每秒执行一次

    dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), 1.0 * NSEC_PER_SEC, 0);

    dispatch_source_set_event_handler(_timer, ^{

        //倒计时结束，关闭

        if(timeOut <=0) {

            dispatch_source_cancel(_timer);

            dispatch_async(dispatch_get_main_queue(), ^{

                weakSelf.backgroundColor= mColor;

                [weakSelfsetTitle:title forState:UIControlStateNormal];

                weakSelf.userInteractionEnabled=YES;

            });

        }else{

            intallTime = (int)timeLine +1;

            intseconds = timeOut % allTime;

            NSString*timeStr = [NSStringstringWithFormat:@"%0.2d", seconds];

            dispatch_async(dispatch_get_main_queue(), ^{

                weakSelf.backgroundColor= color;

                [weakSelfsetTitle:[NSString stringWithFormat:@"%@%@",timeStr,subTitle] forState:UIControlStateNormal];

                weakSelf.userInteractionEnabled=NO;

            });

            timeOut--;

        }

    });

    dispatch_resume(_timer);

}