A UIGestureRecognizer that fires either on long-press or on a force-touch (3D Touch ™️)

LongPressGestureRecognizer.swift

import UIKit.UIGestureRecognizerSubclass

final class MNTLongPressGestureRecognizer: UILongPressGestureRecognizer {
    var triggerWithForceTouch = true
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesBegan(touches, with: event)
        handleTouches(touches, with: event)
    }
    
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesMoved(touches, with: event)
        handleTouches(touches, with: event)
    }
    
    fileprivate func handleTouches(_ touches: Set<UITouch>, with event: UIEvent) {
        guard triggerWithForceTouch,
            state == .possible,
            let traitCollection = view?.traitCollection,
            traitCollection.forceTouchCapability == .available,
            touches.count == 1 else {
                return
        }
        
        let touch = touches.first!
        let force = touch.force / touch.maximumPossibleForce
        
        if force >= 1.0 {
            state = .began
        }
    }
}