UIExpandedTouchAreaButton.swift

import UIKit

@IBDesignable
class UIExpandedTouchAreaButton: UIButton {
    @IBInspectable var margin: CGFloat = 40.0
    
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        let area = self.bounds.insetBy(dx: -margin, dy: -margin)
        return area.contains(point)
    }
}