swift 来自http://nshipster.com/ibinspectable-ibdesignable/

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extension UIView {
    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
            layer.masksToBounds = newValue > 0
        }
    }
}
@IBInspectable var cornerRadius: CGFloat = 0 {
   didSet {
       layer.cornerRadius = cornerRadius
       layer.masksToBounds = cornerRadius > 0
   }
}
@IBInspectable var borderWidth: CGFloat = 0 {
   didSet {
       layer.borderWidth = borderWidth
   }
}
@IBInspectable var borderColor: UIColor? {
   didSet {
       layer.borderColor = borderColor?.CGColor
   }
}

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