Example of @IBDesignable without overdiding drawRect

gistfile1.swift

extension UIColor {
    convenience init(hex: Int, alpha: CGFloat = 1.0) {
        let red = CGFloat((hex & 0xFF0000) >> 16) / 255.0
        let green = CGFloat((hex & 0xFF00) >> 8) / 255.0
        let blue = CGFloat((hex & 0xFF)) / 255.0
        self.init(red:red, green:green, blue:blue, alpha:alpha)
    }
}

@IBDesignable class AvatarView : UIImageView {

    @IBInspectable var borderColor: UIColor = UIColor(hex:0xCCCCCC) {
        didSet {
            setup()
        }
    }

    @IBInspectable var shadowColor: UIColor = UIColor(hex:0x888888) {
        didSet {
            setup()
        }
    }

    func setup() {
        self.backgroundColor = UIColor.whiteColor()
        self.layer.cornerRadius = 12.5
        self.layer.shadowOpacity = 1
        self.layer.shadowOffset = CGSizeMake(0.05, 0.05)
        self.layer.shadowColor = self.shadowColor.CGColor
        self.layer.borderColor = self.borderColor.CGColor
        self.layer.borderWidth = 1.0
        self.layer.masksToBounds = true
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

    override func prepareForInterfaceBuilder() {
        setup()
    }
}