iOS, Swift, UIImagePicker allows editing crop tool removes transparency. Is there fix? - ios

Question

When I get PNG image with transparent background from UIImagePicker it inserts the image with the transparent background just fine as below:
when I set:
imagePicker.allowsEditing = true
it allows me to crop as expected in the view provided by UIImagePicker
but then when I press 'Choose' it returns the image with black instead of a transparent background as below:
The only change between the two results is setting
imagePicker.allowsEditing = true
and cropping the image in the app.
Is there a way to keep transparency or at least change the black to white when cropping?
I have searched the internet and no mention of this that I can see.
Code:
func showImagePicker() {
imagePicker.allowsEditing = true
imagePicker.sourceType = .photoLibrary
present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let pickedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
compImageView?.contentMode = .scaleAspectFit
compImageView?.backgroundColor = UIColor.clear
compImageView?.image = pickedImage
}
dismiss(animated: true, completion: nil)
}

Answer 1

By default UIImagePickerController removes the alpha channels in the edited image. To get that transparency you have to edit image yourself. Implement delegate method like this:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let cropRect = info[UIImagePickerControllerCropRect] as? CGRect {
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
let imageRef: CGImage = image.cgImage!.cropping(to: cropRect)!
let image1: UIImage = UIImage(cgImage: imageRef, scale: image.scale, orientation: image.imageOrientation)
imageView.image = image1
picker.dismiss(animated: true, completion: nil)
}
}
}

Answer 2

Please try this code.
import MobileCoreServices //importing for mediaType kUTTypeImage
func showImagePicker() {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
let mediaTypes: Array<AnyObject> = [kUTTypeImage]
imagePicker.mediaTypes = mediaTypes as! [String]
imagePicker.allowsEditing = true
self.present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if picker.sourceType == UIImagePickerControllerSourceType.photoLibrary {
if let image = info[UIImagePickerControllerEditedImage] as? UIImage {
dismiss(animated: true, completion: nil)
compImageView?.image = image
}
}
}