Apply IBInspectable to all view types in iOS

I'm trying to apply IBInspectable to all types of view like UIView, UIButton, UITextField, UIImageView, etc.
Here's what I did:

@IBDesignable
class BaseView: UIView
{
    override func layoutSubviews() {
        super.layoutSubviews()

        updateCornerRadius()
    }

    @IBInspectable var rounded: Bool = false {
        didSet {
            updateCornerRadius()
        }
    }

    @IBInspectable var cornerRadius: CGFloat = 4 {
        didSet {
            updateCornerRadius()
        }
    }

    private func updateCornerRadius() {
        layer.cornerRadius = rounded ? cornerRadius : 0
    }
}

It is working fine with all UIView using BaseView subclasses in storyboard, but how can I use this for buttons, text fields, image views, etc?

May be using protocols or extensions to avoid repeating this code to all other types of views...

You should use an extension instead of a subclass, and access the layer property directly:

extension UIView
{
    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius;
        }
        set(value) {
            layer.cornerRadius = value;
        }
    }

    var rounded: Bool {
        return layer.cornerRadius > 0.0;
    }
}

Note: Since you're not implementing drawRect using @IBDesignable is needless. You can't implement roundedas a settable property this way, but you can have a read-only property for that.