let generator = UINotificationFeedbackGenerator()
generator.notificationOccurred(.success)

import AudioToolbox

private let isDevice = TARGET_OS_SIMULATOR == 0

func vibrate() {
    if isDevice {
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate)
    }
}

//ATTENTION: This is a private API, if you use this lines of code your app will be rejected

id tapticEngine = [[UIDevice currentDevice] performSelector:NSSelectorFromString(@"_tapticEngine") withObject:nil];
[tapticEngine performSelector:NSSelectorFromString(@"actuateFeedback:") withObject:@(0)];

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [super touchesMoved:touches withEvent:event];

    UITouch *touch = [touches anyObject];

    CGFloat maximumPossibleForce = touch.maximumPossibleForce;
    CGFloat force = touch.force;
    CGFloat normalizedForce = force/maximumPossibleForce;
    NSLog(@"Normalized force : %f", normalizedForce);

    if (normalizedForce > 0.75)
    {
         NSLog(@"Strong");
        // Vibrate device
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
    }
    else
    {
        NSLog(@"Weak");
    }
}

// Vibrate device
NSTimer * vibrationTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(vibrateDevice) userInfo:nil repeats:YES];


- (void) vibrateDevice
{
    if(duration == 2) // duration is a public variable to count vibration duration
    {
          // Stop the device vibration
          [vibrationTimer invalidate];
          return;
    }

    duration++;
    AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}

// 1, 2, 3
let generator = UINotificationFeedbackGenerator()
generator.notificationOccurred(.error)
generator.notificationOccurred(.success)
generator.notificationOccurred(.warning)

// 4
let generator = UIImpactFeedbackGenerator(style: .light)
generator.impactOccurred()

// 5
let generator = UIImpactFeedbackGenerator(style: .medium)
generator.impactOccurred()

// 6
let generator = UIImpactFeedbackGenerator(style: .heavy)
generator.impactOccurred()

// 7
let generator = UISelectionFeedbackGenerator()
generator.selectionChanged()