Get event on UIslider track

Question

How to get an event on UISlider track? I am able to get the events on UISlider's button but not on track. How should I go about it?

Thanks

Answer 1

For doing this you need to subclass the UISlider and implement the touches event like: touchesBegan, touchesEnd,touchesCancelled,touchesMoved etc.

@interface yourSlider:UISlider
@end

@implementation yourSlider
  - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
    }

  - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
    {
    }

  - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    {
    }

  - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
    {
    }
@end

Answer 2

Subclass the UISlider and override its touchesBegan:withEvent: method. Get the point value from the touch event and calculate it's percentage by the point's .x value relative to the width of the slider.

Answer 3

Answers are correct but there is a workaround here , you can simply add a clear button equal to slider coordinations on your slider and detect the touch point on it then convert the X position to a slider value.

    - (IBAction)buttonPressed:(id)sender forEvent:(UIEvent*)event
     {
       UIView *button = (UIView *)sender;
       UITouch *touch = [[event touchesForView:button] anyObject];
       CGPoint location = [touch locationInView:button];
       NSLog(@"Location in button: %f, %f", location.x, location.y); \\ use this x to determine slider's value

      }

Answer 4

Another workaround :

    UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self             action:@selector(sliderTapped:)];
gr.delegate=self;
[Slider addGestureRecognizer:gr];

-(void)sliderTapped:(UIGestureRecognizer*)g{
UISlider* s = (UISlider*)g.view;
if (s.highlighted)
    return; 
CGPoint pt = [g locationInView: s];
CGFloat value = s.minimumValue + pt.x / s.bounds.size.width * (s.maximumValue - s.minimumValue);
[s setValue:value animated:YES];
}