Flip UIView without dim effect - ios

Question

I am trying to create a flip animation in one of my views. I managed to get the animation working but it looks horrible because the card (which has a white background color) dims its color to be darker during the animation.
Do you know if there is a way to get rid of this dim effect to maintain the original color of the cards during the whole animation?
For further reference, please find below a simple view controller reproducing my problem.
import UIKit
class ViewController: UIViewController {
private lazy var cardView: UIView = {
let backgroundView = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
backgroundView.backgroundColor = .white
return backgroundView
}()
private lazy var flipButton: UIButton = {
let flipButton = UIButton(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
flipButton.setTitle("Flip", for: .normal)
flipButton.setTitleColor(.red, for: .normal)
flipButton.addTarget(self, action: #selector(flipCard), for: .touchUpInside)
return flipButton
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .lightGray
view.addSubview(cardView)
cardView.addSubview(flipButton)
cardView.center = view.center
}
#objc
func flipCard() {
UIView.transition(with: cardView, duration: 10, options: .transitionFlipFromRight, animations: nil, completion: nil)
}
}

Answer 1

u can use
UIView.animateKeyframes(withDuration: 6, delay: 0, options: []) {
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5) {
self.cardView.transform3D = CATransform3DRotate(self.cardView.layer.transform, CGFloat.pi, 0, 1, 0)
}
UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 1) {
self.cardView.transform3D = CATransform3DRotate(self.cardView.layer.transform, CGFloat.pi, 0, 1, 0)
}
}
instead of
UIView.transition(with: cardView, duration: 10, options: .transitionFlipFromRight, animations: nil, completion: nil)

Answer 2

You can go through UIView.animate() also in Swift 5,
UIView.animate(withDuration: duration/2, delay: 0, options: .curveLinear) {
targetView.transform = CGAffineTransform.identity.rotated(by: .pi )
} completion: { (_) in
UIView.animate(withDuration: duration/2, delay: 0, options: .curveLinear) {
targetView.transform = CGAffineTransform.identity.rotated(by: .pi * 2)
}
}