UISlider + Texture

good.swift

class DGSliderView: UISlider {
    
    override func trackRect(forBounds bounds: CGRect) -> CGRect {
        return CGRect.init(x: bounds.origin.x, y: bounds.origin.y, width: bounds.size.width, height: 10.0)
    }
}

class SliderNode: ASDisplayNode {
    
    struct Const {
        static let height: ASDimension = .init(unit: .points, value: 10.0)
    }
    
    let sliderNode = ASDisplayNode.init(viewBlock: { () -> UIView in
        let view = DGSliderView.init()
        view.tintColor = .orange
        view.backgroundColor = .clear
        view.maximumTrackTintColor = .clear
        return view
    })
    
    let backgroundNodes: [ASDisplayNode] = (0 ..< 3).map({ _ -> ASDisplayNode in
        let node = ASDisplayNode()
        node.backgroundColor = .gray
        node.style.height = Const.height
        return node
    })
    
    var sliderView: UISlider? {
        return sliderNode.view as? UISlider
    }
    
    override init() {
        super.init()
        self.automaticallyManagesSubnodes = true
    }
    
    override func layout() {
        super.layout()
        
    }
    
    override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
        for e in self.backgroundNodes {
            e.style.flexGrow = 1.0
        }
        let backgroundLayout = ASStackLayoutSpec(direction: .horizontal,
                                                 spacing: 2.0,
                                                 justifyContent: .start,
                                                 alignItems: .stretch,
                                                 children: self.backgroundNodes)
      
        return ASOverlayLayoutSpec(child: backgroundLayout, overlay: sliderNode)
    }
}