iOS-Round-Button.swift

import UIKit

@IBDesignable class RoundButton: UIButton {
    
    override func layoutSubviews() {
        super.layoutSubviews()
        updateCornerRadius()
    }
    
    @IBInspectable var rounded: Bool = false {
        didSet {
            updateCornerRadius()
        }
    }
    
    func updateCornerRadius() {
        layer.cornerRadius = rounded ? frame.size.height / 2 : 0
    }

}