UISlider轨道的厚度没有增加

Question

我似乎无法增加轨道的厚度。一直在尝试其他建议，并在文档中寻找此选项，但它似乎不起作用，有人知道为什么吗？

class factionButton: UISlider {
var factionSlider = UISlider() 

func factionBalanceSlider(){
    factionSlider.frame = CGRect(x: 15, y: 542, width: 386, height: 57)
    factionSlider.minimumValueImage = #imageLiteral(resourceName: "Alliance Slider")
    factionSlider.maximumValueImage = #imageLiteral(resourceName: "Horde Slider")
    factionSlider.setThumbImage(#imageLiteral(resourceName: "Thumb Image"), for: .normal)
    factionSlider.minimumTrackTintColor = UIColor(red:0.08, green:0.33, blue:0.69, alpha:0.8)
    factionSlider.maximumTrackTintColor = UIColor(red:1.00, green:0.00, blue:0.00, alpha:0.59)

    factionSlider.setValue(0.5, animated: true)
    factionSlider.isContinuous = true
    factionSlider.addTarget(self, action: #selector(recordFactionBalance(sender:)) , for: .valueChanged)
}

func getSlider() -> UISlider {
    return factionSlider
}

override func trackRect(forBounds bounds: CGRect) -> CGRect {
    let customBounds = CGRect(x: 16, y: 21, width: 343, height: 7)
    super.trackRect(forBounds: customBounds)
    return customBounds
}

Answer 1

如其他许多答案所述，您可以通过创建如下所示的自定义滑块来更改高度，

class CustomSlider: UISlider {

    override func trackRect(forBounds bounds: CGRect) -> CGRect {
        var rect = super.trackRect(forBounds: bounds)
        rect.size.height = 7
        return rect
    }
}

但是在您的特定情况下，您看不到更改，因为您的实现不允许factionSlider使用overridden trackRect。要使用它，您需要将其更改CustomSlider为以下内容，

class FactionButton: UISlider {
    var factionSlider = CustomSlider() 

    func factionBalanceSlider(){
        factionSlider.frame = CGRect(x: 15, y: 542, width: 386, height: 57)
        factionSlider.minimumValueImage = #imageLiteral(resourceName: "Alliance Slider")
        factionSlider.maximumValueImage = #imageLiteral(resourceName: "Horde Slider")
        factionSlider.setThumbImage(#imageLiteral(resourceName: "Thumb Image"), for: .normal)
        factionSlider.minimumTrackTintColor = UIColor(red:0.08, green:0.33, blue:0.69, alpha:0.8)
        factionSlider.maximumTrackTintColor = UIColor(red:1.00, green:0.00, blue:0.00, alpha:0.59)

        factionSlider.setValue(0.5, animated: true)
        factionSlider.isContinuous = true
        factionSlider.addTarget(self, action: #selector(recordFactionBalance(sender:)) , for: .valueChanged)
    }

    func getSlider() -> UISlider {
        return factionSlider
    }
}

注意在中Swift，class名称应以我上面更新的大写字母开头。其次，我认为FactionButton不应该是subclass的UISlider。