Question

我使用@IBInspectable使用Swift扩展程序在UIButton上设置边框颜色，如下所示：

extension UIButton {
  @IBInspectable var borderWidth: CGFloat {
    get {
      return layer.borderWidth
    }
    set {
      layer.borderWidth = newValue
      layer.masksToBounds = newValue > 0
    }
  }
}

...但我还想为按钮的selectedBorderColor状态设置.Selected属性。这可能是这样的扩展吗？我是否必须继承UIButton并以某种方式检查按钮状态？

extension UIButton {
  @IBInspectable var borderWidth: CGFloat {
    get {
      return layer.borderWidth
    }
    set {
      layer.borderWidth = newValue
      layer.masksToBounds = newValue > 0
    }
  }
  //This is what I want to do...
  @IBInspectable var selectedBorderWidth: CGFloat {
    get {
      return layer.borderWidth
    }
    set {
      layer.borderWidth = newValue
      layer.masksToBounds = newValue > 0
    }
  }
}

提前致谢。

Answer 1

您可以像这样继承UIButton：

class SBButton: UIButton {

    @IBInspectable var borderColor : UIColor = UIColor.whiteColor() {
        didSet {
            self.setNeedsDisplay()
        }
    }

    @IBInspectable var selectedBorderColor : UIColor = UIColor.blackColor() {
        didSet {
            self.setNeedsDisplay()
        }
    }

    override var selected: Bool {
        didSet {
            if selected {
                layer.borderColor = selectedBorderColor.CGColor
            } else {
                layer.borderColor = borderColor.CGColor
            }
        }
    }
}

并使用button.selected = true

使用IBInspectable在选定状态下的UIButton边框颜色

1 个答案: