A Swift Helper class to generate different types of haptics from one class. Just initialize this once in your view controller and call the methods when you need them.

HapticsHelper.swift

/*****************************************************************************
 * FeedbackGenerators.swift
 * Neon: Capture, Edit, Share
 *****************************************************************************
 * Copyright (c) 2020 Neon. All rights reserved.
 *
 * Authors: Swapnanil Dhol <swapnanildhol # gmail.com>
 *
 * Refer to the COPYING file of the official project for license.
 *****************************************************************************/

import UIKit

enum HapticsIntensity: CGFloat {
    case buttonTapLight = 0.3
    case buttonTapMedium = 0.4
    case buttonTapHard = 0.5
    case cellTap = 0.2
    case barButtonTap = 0.25
    case segmentValueChange = 0.45
}

class HapticsHelper {
    private let impactFeedbackGenerator = UIImpactFeedbackGenerator()
    private let notificationFeedbackGenerator = UINotificationFeedbackGenerator()

    init() {
        impactFeedbackGenerator.prepare()
        notificationFeedbackGenerator.prepare()
    }

    func lightButtonTap() {
        impactFeedbackGenerator.impactOccurred(intensity: HapticsIntensity.buttonTapLight.rawValue)
    }

    func mediumButtonTap() {
        impactFeedbackGenerator.impactOccurred(intensity: HapticsIntensity.buttonTapMedium.rawValue)
    }

    func hardButtonTap() {
        impactFeedbackGenerator.impactOccurred(intensity: HapticsIntensity.buttonTapHard.rawValue)
    }

    func cellTap() {
        impactFeedbackGenerator.impactOccurred(intensity: HapticsIntensity.cellTap.rawValue)
    }

    func barButtonTap() {
        impactFeedbackGenerator.impactOccurred(intensity: HapticsIntensity.barButtonTap.rawValue)
    }

    func segmentChangedValue() {
        impactFeedbackGenerator.impactOccurred(intensity: HapticsIntensity.segmentValueChange.rawValue)
    }

    func success() {
        notificationFeedbackGenerator.notificationOccurred(.success)
    }

    func warning() {
        notificationFeedbackGenerator.notificationOccurred(.warning)
    }

    func error() {
        notificationFeedbackGenerator.notificationOccurred(.error)
    }
}

Usage.swift

private let hapticsHelper = HapticsHelper()

private func barButtonTapped(_ sender: UIBarButtonItem) {
  hapticsHelper.barButtonTapped()
}