CALayer in UIScrollView has a wrong size - ios

Question

I'm trying to zoom UIImageView and UIView, which are inside the UIScrollView, but it doesn't work.
I have an UIImage and CALayer, both of them have an equal size (2048×2155). These components wrapped into UIImageView (image view) and UIView (canvas) and displayed inside UIScrollView.
The image view and canvas have the same content scale factor, which equals 2.0 (UIScreen.main.scale), but the canvas has the wrong size (see picture below).
CALayer sublayers were built by using CAShapeLayer and UIBezierPath.
The UIScrollViewDelegate looks next:
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
canvas
}
func scrollViewDidZoom(_ scrollView: UIScrollView) {
self.scrollView.centerContentView()
}
The center content view looks next (method inside custom UIScrollView):
func centerContentView() {
let boundsSize = bounds.size
var centerFrame = canvas.frame
if centerFrame.size.width < boundsSize.width {
centerFrame.origin.x = (boundsSize.width - centerFrame.size.width) / 2.0
} else {
centerFrame.origin.x = 0
}
if centerFrame.size.height < boundsSize.height {
centerFrame.origin.y = (boundsSize.height - centerFrame.size.height) / 2.0
} else {
centerFrame.origin.y = 0
}
imageView.frame = centerFrame
canvas.frame = centerFrame
}
All my efforts have failed. I tried to transform the CALayer with canvas but to no avail. I will be grateful for any suggestions or help. Thank you.

Answer 1

The problem was fixed by using the next lines:
let scale = UIScreen.main.bounds.width / imageSize.height
let scaleTransformation = CATransform3DMakeScale(scale, scale, 1)
for layer in layers {
layer.transform = scaleTransformation
}
where the imageSize equals to the 2048×2155 and everything works fine.
Thank you.