UISlider 轨道不增加厚度

Question

我好像不能增加轨道的厚度。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

你应该先从超级class获取当前边界，然后改变高度：

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

Answer 2

正如许多其他 answers 中提到的，您可以通过创建自定义滑块来更改高度，如下所示，

class CustomSlider: UISlider {

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

但在您的特定情况下，您没有看到更改，因为您的实施不允许 factionSlider 使用 overridden trackRect。要使用它，您需要将其更改为 CustomSlider，如下所示，

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 Swift 中，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 UISlider 的 subclass。

Answer 3

设置矩形大小只会将滑块扩展到底部。所以应该重新计算原点以保持滑块居中。

@IBDesignable
class CustomSlider: UISlider {

@IBInspectable var trackHeight: CGFloat = 6

override func trackRect(forBounds bounds: CGRect) -> CGRect {
    var rect = super.trackRect(forBounds: bounds)
    rect.size.height = trackHeight
    rect.origin.y -= trackHeight / 2
    return rect
  }
}

Answer 4

我添加了这个

1.

class CustomSlider: UISlider {
    
    override func trackRect(forBounds bounds: CGRect) -> CGRect {
        let point = CGPoint(x: bounds.minX, y: bounds.midY)
        return CGRect(origin: point, size: CGSize(width: bounds.width, height: 10)) //this height is the thickness 
    }
    
}

故事板 - 将 UISlider class 更改为我的 CustomSlider

仅供像我这样的新手.. 更改颜色在这里:)

UISlider 轨道不增加厚度

UISlider track not increasing in thickness

swift

uislider