tokenary/Tokenary iOS/Library/ButtonWithExtendedArea.swift

// Copyright © 2021 Tokenary. All rights reserved.

import UIKit

class ButtonWithExtendedArea: UIButton {
    
    var minimumHitArea = CGSize(width: 60, height: 60)

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        if isHidden || !isUserInteractionEnabled || alpha < 0.01 { return nil }
        
        // increase the hit frame to be at least as big as `minimumHitArea`
        let buttonSize = bounds.size
        let widthToAdd = max(minimumHitArea.width - buttonSize.width, 0)
        let heightToAdd = max(minimumHitArea.height - buttonSize.height, 0)
        let largerFrame = bounds.insetBy(dx: -widthToAdd / 2, dy: -heightToAdd / 2)
        
        // perform hit test on larger frame
        return (largerFrame.contains(point)) ? self : nil
    }
    
}