Tilt iPhone to Change UIImage (Accelerometer) - iphone

Question

I'm trying to switch between 2 UIImages using the CoreMotion (Accelerometer) in Swift.
I've implemented a smooth fade transition effect between the two images already and I'm currently using a Button to instantiate this effect. Would like to replace this with the accelerometer, so you can control how the effect is handled.
#IBAction func TapToFade(_ sender: AnyObject) {
let image1:UIImage = UIImage(named: "ImageA")!;
let image2:UIImage = UIImage(named: "ImageB")!;
let crossFade:CABasicAnimation = CABasicAnimation(keyPath: "contents");
crossFade.duration = 3.0;
crossFade.beginTime = 0.0;
crossFade.fromValue = image1.cgImage;
crossFade.toValue = image2.cgImage;
imageView.layer.add(crossFade, forKey:"animateContents");
if crossFade.beginTime < 5.0 {
imageView.image = image2;
}
}

Answer 1

Make sure your device Portrait Orientation Lock set to be off in Control Center and try below code.
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.detectMotion),name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
}
func detectMotion(){
let device = UIDevice.current
switch device.orientation{
case .portrait:
let crossFade:CABasicAnimation = CABasicAnimation(keyPath: "contents");
crossFade.duration = 3.0;
crossFade.beginTime = 0.0;
crossFade.fromValue = UIImage(named: "ImageB.jpg")?.cgImage
crossFade.toValue = UIImage(named: "ImageA.jpg")?.cgImage
imageView.layer.add(crossFade, forKey:"animateContents");
if crossFade.beginTime < 5.0 {
imageView.image = UIImage(named: "ImageA.jpg")
}
case .faceUp:
let crossFade:CABasicAnimation = CABasicAnimation(keyPath: "contents");
crossFade.duration = 3.0;
crossFade.beginTime = 0.0;
crossFade.fromValue = UIImage(named: "ImageA.jpg")?.cgImage
crossFade.toValue = UIImage(named: "ImageB.jpg")?.cgImage
imageView.layer.add(crossFade, forKey:"animateContents");
if crossFade.beginTime < 5.0 {
imageView.image = UIImage(named: "ImageB.jpg")
}
default:
print("unknown")
}
}