不能使UISlider在Left：-0到-50和Right：0到50之间

Question

我的滑块电流为50.如果我向右滚动。我想要得到-0到-50。如果向右滚动我想要得到0到50.我不需要1到100.

帮助。

- (IBAction)sliderValueChanged:(UISlider *)sender {

    if ([myLabel.text length] > 50){
      // Make - 0 to -50 
      myLabel.text =  [NSString stringWithFormat:@"%d", -(int)sender.value];
    }else  if ([myLabel.text length] < 50){   
      // Make 0 to 50
      myLabel.text =  [NSString stringWithFormat:@"%d", (int)sender.value];
    }else{
      myLabel.text =  [NSString stringWithFormat:@"%d", (int)sender.value];

    }
}

Answer 1

设置滑块最小值：

        slider.maximumValue = 100;
        slider.minimumValue = 0;
        slider.value = 50;

for Action

- (void)sliderMoved:(id)sender  {
        //DLog(@"slider moved");
        UISlider*timeSlider = (UISlider*)sender;
        if (timeSlider.value < 0)   {
            timeSlider.value = -50;
        }
        else if (timeSlider.value < 30) {
            timeSlider.value = -30;
        }
        else if (timeSlider.value < 50) {
            timeSlider.value = 0;
        }
        else if (timeSlider.value < 80) {
            timeSlider.value = 30;
        }
        else if (timeSlider.value < 100)    {
            timeSlider.value = 50;
        }

        else    {
            timeSlider.value = 0;
        }
        _chosenDuration = timeSlider.value;
        [_timeLabel setText:[NSString stringWithFormat: NSLocalizedString(@"time%@", nil) , _chosenDuration]];
    }

设置所有条件你想要的......