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

LongPressGestureRecognizer.swift

import Foundation
import UIKit
import UIKit.UIGestureRecognizerSubclass


/// A Gesture Recognizer that fires either on long press, or on "3D Touch"
final class MNTLongPressGestureRecognizer: UILongPressGestureRecognizer {

    // MARK: - Properties

    var triggerWithForceTouch: Bool = true

    // MARK: - UIGestureRecognizer

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesBegan(touches, with: event)
        self.handleTouches(touches, with: event)
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesMoved(touches, with: event)
        self.handleTouches(touches, with: event)
    }
}

// MARK: - Private

private extension MNTLongPressGestureRecognizer {

    func handleTouches(_ touches: Set<UITouch>, with event: UIEvent) {
        guard self.triggerWithForceTouch else { return }
        guard self.state == .possible else { return }
        guard let traitCollection = self.view?.traitCollection else { return }
        guard traitCollection.forceTouchCapability == .available else { return }
        guard touches.count == 1 else { return }

        let touch = touches.first!
        let force = touch.force / touch.maximumPossibleForce

        if force >= 1.0 {
            self.state = .began
            MNTTapticFeedbackGenerator.executePeek()
        }
    }
}