Animation lags on device, but not in Simulator

I want to trigger a CAAnimation with a Button. In playground and in the simulator, this works exactly as I want it to. However, when I run the same code on a device, the animation happens only after a short delay.

Apparently, the issue only happens on iOS 11.2.6. I updated my device and can now not reproduce the issue anymore. Can anyone confirm, or find out, how it would work on iOS 11.2.6?

import UIKit  class MyViewController : UIViewController {     let animatedView = UIView()      override func loadView() {         let view = UIView()         view.backgroundColor = .white          // Add a button         let button = UIButton(type: .system)         button.frame = CGRect(x: 150, y: 200, width: 200, height: 50)         button.setTitle("Animate", for: .normal)         button.addTarget(self, action: #selector(tap), for: .touchUpInside)          // Set color and frame of the view, that is animated.         animatedView.backgroundColor = UIColor.blue         animatedView.frame = CGRect(x: 50, y: 50, width: 50, height: 50)          // Add the views to the view hierarchy         view.addSubview(animatedView)         view.addSubview(button)         self.view = view     }      /// On Tap create an animation, that changes the position of the animated view.     @objc func tap() {         let originalY = animatedView.layer.position.y         let animation = CABasicAnimation(keyPath: "position.y")         animation.fromValue = originalY         animation.toValue = 300.0         animation.duration = 1.0         animatedView.layer.add(animation, forKey: "positionAnimation")     } } 

1 Answers

Answers 1

I have tested your code in 6s+ with 11.2.6 but not getting delay... also working fine with other versions.

Maybe something going wrong with a specific device as based on device specification.

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