iOS：swift xib边框颜色,圆角等

layer.cornerRadius
layer.borderWidth
layer.borderUIColor

边框颜色要写extension

@IBDesignable extension CALayer {
    @IBInspectable var borderUIColor: UIColor {
        get {
            return UIColor(cgColor: self.borderColor!)
        }
        set {
            self.borderColor = newValue.cgColor
        }
    }
}

https://www.jianshu.com/p/f3506690b065