How to get the center of the thumb image of UISlider

Question

I\'m creating a custom UISlider to test out some interface ideas. Mostly based around making the thumb image larger.

I found out how to do that, <

Answer 1

This will work for the UISlider being placed anywhere on the screen. Most of the other solutions will only work when the UISlider is aligned with the left edge of the screen. Note, I used frame rather than bounds for the thumbRect, to achieve that. And I show two variations, based on using frame or bounds for the trackRect

extension UISlider {

    //this version will return the x coordinate in relation to the UISlider frame
    var thumbCenterX: CGFloat {
        return thumbRect(forBounds: frame, trackRect: trackRect(forBounds: bounds), value: value).midX
    }

    //this version will return the x coordinate in relation to the UISlider's containing view
    var thumbCenterX: CGFloat {
        return thumbRect(forBounds: frame, trackRect: trackRect(forBounds: frame), value: value).midX
    }

}