UISlider track height

问题

I have implemented UISlider and I need to adjust track height. I found this but its not working.

self.slider.trackRect(forBounds: CGRect(x: 0, y: 0, width: 100, height: 100))

回答1:

found this but its not working

Because you're using it wrong. You don't call it. You subclass, and override it.

However, the right approach is to supply new images for the track, with setMinimumTrackImage and setMaximumTrackImage.

回答2:

Ok...I used matt's answer + provided example and I customized the code for my needs.

let coinEnd = UIImage(/*HERE_LEFT_BLANK_IMG*/).resizableImage(withCapInsets:
        UIEdgeInsetsMake(0,7,0,7), resizingMode: .stretch)
.
.
.
.

override func trackRect(forBounds bounds: CGRect) -> CGRect {
    var result = super.trackRect(forBounds: bounds)
    result.origin.x = 0
    result.size.width = bounds.size.width
    result.size.height = 10 //added height for desired effect
    return result
}

override func thumbRect(forBounds bounds: CGRect, trackRect rect: CGRect, value: Float) -> CGRect {
    return super.thumbRect(forBounds:
        bounds, trackRect: rect, value: value)
        .offsetBy(dx: 0/*Set_0_value_to_center_thumb*/, dy: 0)
}

then inherid this to my Slider and woala.

This is my desired result.

All hail matt...thank you.

来源：https://stackoverflow.com/questions/41959164/uislider-track-height