How to make iPhone vibrate using Swift?

In iOS 10 on iPhone 7 or 7 Plus, try:

let generator = UIImpactFeedbackGenerator(style: .heavy)
generator.impactOccurred()

Swift 4.2 Updated

Just insert code below into your project.

Usage

Vibration.success.vibrate()

Source Code

  enum Vibration {
        case error
        case success
        case warning
        case light
        case medium
        case heavy
        @available(iOS 13.0, *)
        case soft
        @available(iOS 13.0, *)
        case rigid
        case selection
        case oldSchool

        public func vibrate() {
            switch self {
            case .error:
                UINotificationFeedbackGenerator().notificationOccurred(.error)
            case .success:
                UINotificationFeedbackGenerator().notificationOccurred(.success)
            case .warning:
                UINotificationFeedbackGenerator().notificationOccurred(.warning)
            case .light:
                UIImpactFeedbackGenerator(style: .light).impactOccurred()
            case .medium:
                UIImpactFeedbackGenerator(style: .medium).impactOccurred()
            case .heavy:
                UIImpactFeedbackGenerator(style: .heavy).impactOccurred()
            case .soft:
                if #available(iOS 13.0, *) {
                    UIImpactFeedbackGenerator(style: .soft).impactOccurred()
                }
            case .rigid:
                if #available(iOS 13.0, *) {
                    UIImpactFeedbackGenerator(style: .rigid).impactOccurred()
                }
            case .selection:
                UISelectionFeedbackGenerator().selectionChanged()
            case .oldSchool:
                AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
            }
        }
    }

Short example:

import UIKit
import AudioToolbox

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        AudioServicesPlayAlertSound(SystemSoundID(kSystemSoundID_Vibrate))            
    }
}

load onto your phone and it will vibrate. You can put it in a function or IBAction as you wish.

Code Update:

 AudioServicesPlayAlertSoundWithCompletion(SystemSoundID(kSystemSoundID_Vibrate)) { }

As apple code docs written:

This function will be deprecated in a future release. Use AudioServicesPlaySystemSoundWithCompletion instead.

NOTE: If vibrate doesn't work. check vibrate is enable in sounds and haptics settings