Get length of Long Press Gesture

longpressGestureLength.swift

// Swift 3

// If you'd like to use the gestureDuration outside of the scope of the button press, create some variables.
var gestureStartTime: TimeInterval!
var gestureDuration: TimeInterval!    

// IBAction for UILongPressGestureRecognizer
@IBAction func recordButtonHeld(_ sender: UILongPressGestureRecognizer) {
        
        switch sender.state {
            
        case .began:
          // By default, .began triggers after the button is held for 0.5 seconds.
          // This can be adjusted by changing the minimumPressDuration property
          gestureStartTime = Date.timeIntervalSinceReferenceDate
            
        case .ended:
          gestureDuration = Date.timeIntervalSinceReferenceDate - gestureStartTime
        
        default:
            break
        }
    }

// Now you have the gestureDuration value in a variable and can use it however you like in your code.