做个倒计时控件吧

现在的App都用手机验证码登录了，各种使用按钮做60s倒计时，我这里正好有一个之前用过的，来搞一搞事情

+(void)countDownWith:(UIButton *)sender telNumber:(NSString *)telNumber smsType:(NSString *)smsType block:(void(^)(NSString *verifyCode))block{
    sender.userInteractionEnabled = NO;
    
    
    //    发送手机号 并发送验证码
   //这里写请求
    [request callVerifyback:^(SKResponse *response) {
        __block int timeout=59; //倒计时时间
        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){ //倒计时结束，关闭
                dispatch_source_cancel(_timer);
                dispatch_async(dispatch_get_main_queue(), ^{
                    //设置界面的按钮显示 根据自己需求设置
                    //                    [sender setBackgroundColor:setRGBColor(255, 204, 1)];
                    [sender setTitle:@"获取验证码" forState:UIControlStateNormal];
                    sender.userInteractionEnabled = YES;
                });
            }else{
                int seconds = timeout % 60;
                NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
                dispatch_async(dispatch_get_main_queue(), ^{
                    //                    [sender setBackgroundColor:[UIColor lightGrayColor]];
                    [sender setTitle:[NSString stringWithFormat:@"已发送 %@s",strTime] forState:UIControlStateNormal];
                });
                timeout--;
            }
        });
        dispatch_resume(_timer);
        //[SVProgressHUD showSuccessWithStatus:response.data[@"code"]];
        block([response.data objectForKey:@"code"]);
    } error:^(NSString *errorMsg) {
        sender.userInteractionEnabled = YES;
    }];
}

按钮的搞定，那其他的控件也是可以的咯，改一改用起来咯！比如现在我要做一个倒计时的label，而且label上面的文字要有缩放效果，那就这样改

+ (void)countDownWith:(UILabel *)sender block:(void(^)())block{
    sender.userInteractionEnabled = NO;
        __block int timeout=5; //倒计时时间
        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){ //倒计时结束，关闭
                dispatch_source_cancel(_timer);
                dispatch_async(dispatch_get_main_queue(), ^{
                    //设置界面的按钮显示 根据自己需求设置
                    [sender removeFromSuperview];
                });
            }else{
                int seconds = timeout % 60;
                NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
                dispatch_async(dispatch_get_main_queue(), ^{
                    sender.text = strTime;
                    sender.alpha = 1;
                    sender.transform = CGAffineTransformIdentity;
                    [UIView animateWithDuration:0.7 animations:^{
                        CGAffineTransform newTransform =  CGAffineTransformScale(sender.transform, 2, 2);//2,2表示放大的大小
                        sender.transform = newTransform;
                    } completion:^(BOOL finished) {
                        [UIView animateWithDuration:0.3 animations:^{
                            sender.alpha = 0.3;
                        } completion:^(BOOL finished) {
                        }];
                    }];
                });
                timeout--;
            }
        });
        dispatch_resume(_timer);
}

就是这么简单！