HapticFeedback-Deallocate.swift

import UIKit

var feedbackGenerator : UISelectionFeedbackGenerator? = nil

@IBAction func gestureHandler(_ sender: UIPanGestureRecognizer) {
    switch sender.state {
    case .began:
        // Instantiate a new generator
        feedbackGenerator = UISelectionFeedbackGenerator()
        
        // Prepare the generator when the gesture begins
        feedbackGenerator?.prepare()
    case .changed:
        // Check to see if the selection has changed...
        if  myCustomHasSelectionChangedMethod(translationPoint: sender.translation(in: view)) {
            // Trigger selection feedback
            feedbackGenerator?.selectionChanged()
            
            // Keep the generator in a prepared state
            feedbackGenerator?.prepare()
        }
    case .cancelled, .ended, .failed:
        // Release the current generator
        feedbackGenerator = nil
    default:
        break
    }
}