Extended tap area for UIButton

TapAreaButton.swift

// Methods to extend tap area to a minimal size
extension UIView {
    
	// Golden standard of minimal tap sizes [citation needed]
    static let minimalTapSize: CGSize = CGSize(width: 44, height: 44)
    
    /// Extends the rect to be at least as big as ``minimalTapSize``
    class func extendedTapArea(from rect: CGRect) -> CGRect {
        rect.insetBy(
            dx: min(0, (rect.width - minimalTapSize.width) / 2),
            dy: min(0, (rect.height - minimalTapSize.height) / 2)
        )
    }
    
    /// Extended `bounds` to be at least as big as ``minimalTapSize``
    var extendedTapBounds: CGRect {
        UIView.extendedTapArea(from: bounds)
    }
}

class TapAreaButton: UIButton {
    
    // Allow for a bigger tap area, if needed
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        if super.point(inside: point, with: event) {
            return true
        }
        return extendedTapBounds.contains(point)
    }
}

class ButtonTapAreaContainer: UIView {
    
    // Manually search for subviews with bigger tap area
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        guard let defaultResult = super.hitTest(point, with: event) else {
            return nil
        }
        
        guard defaultResult == self else {
            // When the default hitTest already finds a suitable view
            // there‘s no need for extended bounds checking
            return defaultResult
        }
        
        // Find the first subview where the extended bounds contain the point
        let foundSubview = subviews.first { subview in
            let convertedPoint = self.convert(point, to: subview)
            guard subview.extendedTapBounds.contains(convertedPoint) else {
                return false
            }
            return true
        }
        
        // Return the found subview or otherwise just the original result
        return foundSubview ?? defaultResult
    }
}