How to enable “tap and slide” in a UISlider?

Question

What I want to get is a UISlider which lets the user not only slide when he starts on its thumbRect, but also when he taps elsewhere. When the user

Answer 1

I converted the answer provided by DWilliames to Swift

Inside your viewDidAppear()

let longPress                  = UILongPressGestureRecognizer(target: self.slider, action: Selector("tapAndSlide:"))
longPress.minimumPressDuration = 0
self.addGestureRecognizer(longPress)

Class file

class TapUISlider: UISlider
{
    func tapAndSlide(gesture: UILongPressGestureRecognizer)
    {
        let pt           = gesture.locationInView(self)
        let thumbWidth   = self.thumbRect().size.width
        var value: Float = 0

        if (pt.x <= self.thumbRect().size.width / 2)
        {
            value = self.minimumValue
        }
        else if (pt.x >= self.bounds.size.width - thumbWidth / 2)
        {
            value = self.maximumValue
        }
        else
        {
            let percentage = Float((pt.x - thumbWidth / 2) / (self.bounds.size.width - thumbWidth))
            let delta      = percentage * (self.maximumValue - self.minimumValue)

            value          = self.minimumValue + delta
        }

        if (gesture.state == UIGestureRecognizerState.Began)
        {
            UIView.animateWithDuration(0.35, delay: 0, options: UIViewAnimationOptions.CurveEaseInOut,
            animations:
            {
                self.setValue(value, animated: true)
                super.sendActionsForControlEvents(UIControlEvents.ValueChanged)
            },
            completion: nil)
        }
        else
        {
            self.setValue(value, animated: false)
        }
    }

    func thumbRect() -> CGRect
    {
        return self.thumbRectForBounds(self.bounds, trackRect: self.bounds, value: self.value)
    }
}