A Swift UIButton subclass to expand the touch area of the button.

MNGExpandedTouchAreaButton.swift

//
//  MNGExpandedTouchAreaButton.swift
//  
//
//  Created by Tommie Carter on 7/7/15.
//  Copyright © 2015 MING Technology. All rights reserved.
//

import UIKit

@IBDesignable
class MNGExpandedTouchAreaButton: UIButton {

    @IBInspectable var margin: CGFloat = 20.0
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        // increase touch area for control in all directions by 20
        
        let area = self.bounds.insetBy(dx: -margin, dy: -margin)
        return area.contains(point)
    }

}

Update for Swift 5