UIViewControllerRepresentable and property wrapper behavior in iOS14, using with CropViewController - ios

Question

I'm using "UIImagePickerController" and "CropViewController" to modify an image selected from photo library. Since the target OS version is 13+, "UIViewControllerRepresentable" is utilized for treating these UIKit parts in SwiftUI. Xcode version is 12.0.
(Note) CropViewController is a 3rd party library.
Source is here: https://github.com/TimOliver/TOCropViewController
I found a strange behavior when launching on iOS14 and can't find out the cause. Please help me!!
The below is what I've done. I added "print()" in the code numbered from "//**** 1****" to '//**** 3****' to show you what is strange.
[ UIImagePickerController ]
import SwiftUI
struct ImagePicker: UIViewControllerRepresentable {
#Binding var isPresented: Bool // this is a flag used for presenting "UIImagePickerController"
#Binding var materialImage: UIImage? // this is to be passed to "CropViewController"
#Binding var showCropView: Bool // this is a flag used for presenting "CropViewController"
func makeCoordinator() -> ImagePicker.Coordinator {
return ImagePicker.Coordinator(
isPresented: $isPresented,
materialImage: $materialImage,
showCropView: $showCropView
)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
let picker = UIImagePickerController()
picker.delegate = context.coordinator
picker.sourceType = .photoLibrary
return picker
}
func updateUIViewController(_ uiViewController: UIImagePickerController,
context: UIViewControllerRepresentableContext<ImagePicker>) {}
}
extension ImagePicker {
class Coordinator: NSObject, UINavigationControllerDelegate {
#Binding var isPresented: Bool
#Binding var materialImage: UIImage?
#Binding var showCropView: Bool
public init(isPresented: Binding<Bool>, materialImage: Binding<UIImage?>, showCropView: Binding<Bool>) {
self._isPresented = isPresented
self._materialImage = materialImage
self._showCropView = showCropView
}
}
}
extension ImagePicker.Coordinator: UIImagePickerControllerDelegate {
public func imagePickerController(
_ picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
DispatchQueue.mainSyncSafe {
self.materialImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage
isPresented = false // close UIImagePicker
showCropView = true // launch CropViewController
print("materialImage #ImagePicker: \(materialImage)") // ****1****
}
}
public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
isPresented = false
}
}
[ CropViewController]
import SwiftUI
import CropViewController
struct CropView: UIViewControllerRepresentable {
var materialImage: UIImage? // selected image with ImagePickerController
#Binding var newImage: UIImage? // modified image with CropViewController
#Binding var isPresented: Bool // this is a flag to show/hide CropViewController
init(materialImage: UIImage?, newImage: Binding<UIImage?>, isPresented: Binding<Bool>){
self.materialImage = materialImage
self._newImage = newImage
self._isPresented = isPresented
}
func makeCoordinator() -> CropView.Coordinator {
return CropView.Coordinator(
isPresented: $isPresented,
newImage: $newImage
)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<CropView>) -> CropViewController {
let cropViewController = CropViewController(image: materialImage ?? UIImage())
print("materialImage #CropView: \(materialImage)") // ****2****
cropViewController.delegate = context.coordinator
return cropViewController
}
func updateUIViewController(_ uiViewController: CropViewController,
context: UIViewControllerRepresentableContext<CropView>) {}
}
extension CropView {
class Coordinator: NSObject {
#Binding var isPresented: Bool
#Binding var newImage: UIImage?
public init(isPresented: Binding<Bool>, newImage: Binding<UIImage?>) {
self._isPresented = isPresented
self._newImage = newImage
}
}
}
extension CropView.Coordinator: ObservableObject, CropViewControllerDelegate {
func cropViewController(_ cropViewController: CropViewController, didCropToImage image: UIImage, withRect cropRect: CGRect, angle: Int) {
newImage = image
isPresented = false
NotificationCenter.default.post(name: .imageSelected, object: nil, userInfo: nil)
}
func cropViewController(_ cropViewController: CropViewController, didFinishCancelled cancelled: Bool) {
isPresented = false
}
}
[ Content.swift ]
import SwiftUI
struct Content: View {
#State var showImagePicker: Bool = false // flag for show/hide UIImagePickerController
#State var showCropView: Bool = false // flag for show/hide CropViewController
#State var materialImage: UIImage? // selected image with UIImagePickerController
#State var newImage: UIImage? // modified Image with CropViewController
var body: some View {
VStack{
// show some views
Spacer().frame(height: 0).sheet(isPresented: $showImagePicker) {
ImagePicker(isPresented: self.$showImagePicker, materialImage: self.$materialImage, showCropView: self.$showCropView)
}
Spacer().frame(height: 0.0).sheet(isPresented: self.$showCropView) {
CropView(materialImage: self.materialImage, newImage: self.$newImage, isPresented: self.$showCropView)
}
}
.onReceive( NotificationCenter.default.publisher(for: .imageSelected) ){_ in
print("materialImage #Content: \(materialImage)") // ****3****
}
}
}
When launching with a simulator of iOS13.5, debug print is like below.
There is an unkown message, but this is fine.
materialImage #ImagePicker: Optional(<UIImage:0x600002810510 anonymous {4032, 3024}>) // ****1****
materialImage #CropView: Optional(<UIImage:0x600002810510 anonymous {4032, 3024}>) // ****2****
2020-09-22 sbx[ ] [Common] _BSMachError: port c603; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
materialImage #CreateAdv_SwiftUIView: Optional(<UIImage:0x600002810510 anonymous {4032, 3024}>) // ****3****
With a simulator of iOS14, CropView screen is black and debug print is like below. "materialImage #CropView" is nil. And more strange, after dismiss this cropview screen (using cancel button), and select image again, it goes fine (I can select and modify an image).
Is there a bug in iOS14? Or is my implementation bad?
materialImage #ImagePicker: Optional(<UIImage:0x600003f3cf30 anonymous {4032, 3024}>) // ****1****
materialImage #CropView: nil // ****2****
2020-09-22 sbx[ ] [ScrollView] UIScrollView is ignoring an attempt to set zoomScale to a non-finite value: inf
2020-09-22 sbx[ ] [Unknown process name] CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
materialImage #CreateAdv_SwiftUIView: Optional(<UIImage:0x600003f3cf30 anonymous {4032, 3024}>) // ****3****
2020-09-22 sbx[ ] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed
I hope your advice! Thank you!!