[Solved] set UIslider thumb image in swift

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If you want to clip the top part of the thumbImage, you should use:

public func thumbRectForBounds(bounds: CGRect, trackRect rect: CGRect, value: Float) -> CGRect

So add this to your code:

durationSlider.thumbRectForBounds(...)

And set the CGRect of the thumbRect to have the value of durationSlider.frame.origin.y as its own origin.y.

Here’s another temporary solution, I’ll get back to the thumbRectForBounds method shortly:

let mask = CAGradientLayer(layer: durationSlider.layer)
let lineTop = (durationSlider.bounds.height/2 - 0.5) / durationSlider.bounds.height
mask.frame = durationSlider.bounds
mask.colors = [UIColor.clearColor().CGColor, UIColor.blackColor().CGColor]
mask.locations = [lineTop, lineTop]
durationSlider.layer.mask = mask

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solved set UIslider thumb image in swift