ImagePicker.swift

import SwiftUI
import PhotosUI

final class ViewModel: ObservableObject {
    @Published var image: UIImage?
}

struct Spinner: UIViewRepresentable {

    let isAnimating: Bool

    func makeUIView(context: Context) -> UIActivityIndicatorView {
        let activity = UIActivityIndicatorView(style: .large)
        activity.hidesWhenStopped = false
        return activity
    }

    func updateUIView(_ uiView: UIActivityIndicatorView, context: Context) {
        isAnimating ? uiView.startAnimating() : uiView.stopAnimating()
    }
}


struct ImagePicker: UIViewControllerRepresentable {

    @Binding var isShowingPicker: Bool
    @Binding var image: UIImage?

    final class MyCoordinator: PHPickerViewControllerDelegate {

        var parent: ImagePicker

        init(_ parent: ImagePicker) {
            self.parent = parent
        }

        func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
            print("finished")
            parent.isShowingPicker = false
            for result in results {
                dump(result)
                if result.itemProvider.canLoadObject(ofClass: UIImage.self) {
                    result.itemProvider.loadObject(ofClass: UIImage.self) { (image, error) in
                        if let image = image {
                            DispatchQueue.main.async {
                                self.parent.image = image as? UIImage
                            }
                        }
                    }
                }
            }
        }
    }
    func makeCoordinator() -> MyCoordinator {
        MyCoordinator(self)
    }
    func makeUIViewController(context: Context) -> PHPickerViewController {

        var configuration = PHPickerConfiguration()
        configuration.filter = .images
        configuration.selectionLimit = 1
        let picker = PHPickerViewController(configuration: configuration)

        picker.delegate = context.coordinator

        return picker
    }
    func updateUIViewController(_ uiViewController: PHPickerViewController, context: Context) {
    }
}



struct ContentView: View {

    @State private var image: UIImage?
    @State private var showingImagePicker = false
    @State private var spinning = true

    var body: some View {
        ZStack {
            Color.gray
            VStack {
                if let image = image {
                    Image(uiImage: image)
                        .resizable()
                        .scaledToFit()
                }
                Button("Select Image") {
                    showingImagePicker = true
                }
                Spinner(isAnimating: spinning).onTapGesture {
                    spinning.toggle()
                }
            }
        }.sheet(isPresented: $showingImagePicker) {
            ImagePicker(isShowingPicker: $showingImagePicker, image: $image)

        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}