Swift: Fading two images while chaging frame - swift4

Question

Can someone tell me how can I animate a cross dissolve transition while chaging the initial frame?
My code:
self.image = initialImage
UIView.transition(with: _self, duration: 10.0, options: [.transitionCrossDissolve, .allowUserInteraction], animations: {
self.image = newImage
})
Also tried:
let transition = CATransition()
transition.duration = 10
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.type = kCATransitionFade
transition.delegate = self
self?.layer.add(transition, forKey: nil)
Changing the frame size while the animation runs leaves the initial image at the initial frame size, while the newImage adapts to the updated frame.
Thank you.

Answer 1

For an easier approach, create two image view instances and animate the alpha of the first one, while changing the frame for both of them.
let firstImageView = UIImageView(image: UIImage(named: "first"))
firstImageView.frame = CGRect(x: 100, y: 100, width: 200, height: 200)
let secondImageView = UIImageView(image: UIImage(named: "second"))
secondImageView.frame = firstImageView.frame
//the second image view should obscure the first one, that's why it's the first in the array
let imageViews = [secondImageView, firstImageView]
imageViews.forEach { view.addSubview($0) }
let newFrame = CGRect(x: 50, y: 50, width: 100, height: 100)
UIView.animate(withDuration: 10) {
firstImageView.alpha = 0
imageViews.forEach { $0.frame = newFrame }
}