SimpleTapticEngineExample-Private.swift

// Initialize in viewDidLoad
let mediumImpactFeedbackGenerator = UIImpactFeedbackGenerator(style: .medium)

// Prepare in viewDidAppear
mediumImpactFeedbackGenerator.prepare()

// Play haptic signal
if let feedbackSupportLevel = UIDevice.current.value(forKey: "_feedbackSupportLevel") as? Int {
    switch feedbackSupportLevel {
    case 2:
        // 2nd Generation Taptic Engine w/ Haptic Feedback (iPhone 7/7+)
        mediumImpactFeedbackGenerator.impactOccurred()
    case 1:
        // 1st Generation Taptic Engine (iPhone 6S/6S+)
        let peek = SystemSoundID(1519)
        AudioServicesPlaySystemSound(peek)
    case 0:
        // No Taptic Engine
        break
    default: break
    }
}