UIButton添加倒计时

最近一个项目有获取手机短信跟邮箱验证码功能, 所以要加一个UIButton倒计时功能

例子代码如下:

 //获取验证码按钮
 - (IBAction)getButtonClick:(UIButton *)sender;

 #pragma mark - 获取验证码
 - (IBAction)getButtonClick:(UIButton *)sender
 {
     //正常状态下的背景颜色
     UIColor *mainColor = [UIColorcolorWithRed:/.0green:/.0blue:/.0alpha:1.0f];
     //倒计时状态下的颜色
     UIColor *countColor = [UIColorlightGrayColor];
     [selfsetTheCountdownButton:sender startWithTime:5title:@"获取验证码"countDownTitle:@"s"mainColor:mainColor countColor:countColor];
 }

 #pragma mark - button倒计时
 - (void)setTheCountdownButton:(UIButton *)button startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color {
     //倒计时时间
     __block NSInteger timeOut = timeLine;
     dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,);
     dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,, , queue);
     //每秒执行一次
     dispatch_source_set_timer(_timer,dispatch_walltime(NULL,), 1.0 * NSEC_PER_SEC,);
     dispatch_source_set_event_handler(_timer, ^{
 
         //倒计时结束，关闭
         if (timeOut == ) {
             dispatch_source_cancel(_timer);
             dispatch_async(dispatch_get_main_queue(), ^{
                 button.backgroundColor = mColor;
                [button setTitle:titleforState:UIControlStateNormal];
                 button.userInteractionEnabled =YES;
             });
         } else {
             int seconds = timeOut % ;
             NSString *timeStr = [NSStringstringWithFormat:@"%0.1d", seconds];
             dispatch_async(dispatch_get_main_queue(), ^{
                 button.backgroundColor = color;
                 [button setTitle:[NSStringstringWithFormat:@"%@%@",timeStr,subTitle]forState:UIControlStateNormal];
                 button.userInteractionEnabled =NO;
             });
             timeOut--;
         }
     });
     dispatch_resume(_timer);
 }