how to get the rect of an image to crop it - ios

Question

I am building a app where you can crop multiple images. I am using this code directly from apple:
func cropImage(_ inputImage: UIImage, toRect cropRect: CGRect, viewWidth: CGFloat, viewHeight: CGFloat) -> UIImage?
{
let imageViewScale = max(inputImage.size.width / viewWidth,
inputImage.size.height / viewHeight)
// Scale cropRect to handle images larger than shown-on-screen size
let cropZone = CGRect(x:cropRect.origin.x * imageViewScale,
y:cropRect.origin.y * imageViewScale,
width:cropRect.size.width * imageViewScale,
height:cropRect.size.height * imageViewScale)
// Perform cropping in Core Graphics
guard let cutImageRef: CGImage = inputImage.cgImage?.cropping(to:cropZone)
else {
return nil
}
// Return image to UIImage
let croppedImage: UIImage = UIImage(cgImage: cutImageRef)
return croppedImage
}
to crop the image I need a cropRect. I found also a solution in the Internet that I implemented in my code:
func realImageRect() -> CGRect {
let imageViewSize = self.frame.size
let imgSize = self.image?.size
guard let imageSize = imgSize else {
return CGRect.zero
}
let scaleWidth = imageViewSize.width / imageSize.width
let scaleHeight = imageViewSize.height / imageSize.height
let aspect = fmin(scaleWidth, scaleHeight)
var imageRect = CGRect(x: 0, y: 0, width: imageSize.width * aspect, height: imageSize.height * aspect)
// Center image
imageRect.origin.x = (imageViewSize.width - imageRect.size.width) / 2
imageRect.origin.y = (imageViewSize.height - imageRect.size.height) / 2
// Add imageView offset
imageRect.origin.x += self.frame.origin.x
imageRect.origin.y += self.frame.origin.y
return imageRect
}
As I already said, the app can crop multiple images. The images are stored in a array. I also have a crop view, which you can drag around the image with a pan gesture
for i in 0..<imageContentView.count {
let cropRect = CGRect(x: croppedViewArray[i].frame.origin.x - imageContentView[i].realImageRect().origin.x, y: croppedViewArray[i].frame.origin.y - imageContentView[i].realImageRect().origin.y, width: croppedViewArray[i].frame.width, height: croppedViewArray[i].frame.height)
print("cropRect", cropRect)
let croppedImage = ImageCrophandler.sharedInstance.cropImage(imageContentView[i].image!, toRect: cropRect, viewWidth: imageContentView[i].frame.width, viewHeight: imageContentView[i].frame.height)
print("cheight", croppedImage!.size.height,"cwidth", croppedImage!.size.width)
arrayOfCropedImages.append(croppedImage!)
}
The problem what I have is, that every cropped image has a different height and widths, but the images should be all the same size.
I figured out that the size gets calculated on which position the crop view is located.