How to open the ImagePicker in SwiftUI?

Question

I need to open the ImagePicker in my app using SwiftUI, how can I do that?

I thought about using the UIImagePickerController, but I don\'t know how to do that in Swi

Answer 1

Here's a version that works in Xcode 11 beta 4.

It uses a BindableObject singleton (ImagePicker.shared) with two properties: .view and .image.

See usage below (ImagePickerTestView)

import SwiftUI
import Combine

final class ImagePicker : BindableObject {

    static let shared : ImagePicker = ImagePicker()

    private init() {}  //force using the singleton: ImagePicker.shared

    let view = ImagePicker.View()
    let coordinator = ImagePicker.Coordinator()

    // Bindable Object part
    let willChange = PassthroughSubject()

    @Published var image: Image? = nil {
        didSet {
            if image != nil {
                willChange.send(image)
            }
        }
    }
}


extension ImagePicker {

    class Coordinator: NSObject, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

        // UIImagePickerControllerDelegate
        func imagePickerController(_ picker: UIImagePickerController,
                                   didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
            let uiImage = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
            ImagePicker.shared.image = Image(uiImage: uiImage)
            picker.dismiss(animated:true)
        }

        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            picker.dismiss(animated:true)
        }
    }


    struct View: UIViewControllerRepresentable {

        func makeCoordinator() -> Coordinator {
            ImagePicker.shared.coordinator
        }

        func makeUIViewController(context: UIViewControllerRepresentableContext) -> UIImagePickerController {
            let picker = UIImagePickerController()
            picker.delegate = context.coordinator
            return picker
        }

        func updateUIViewController(_ uiViewController: UIImagePickerController,
                                    context: UIViewControllerRepresentableContext) {

        }

    }

}


struct ImagePickerTestView: View {

    @State var showingPicker = false

    @State var image : Image? = nil
    // you could use ImagePicker.shared.image directly

    var body: some View {
        VStack {
            Button("Show image picker") {
                self.showingPicker = true
            }

            image?
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(width: 300)

        }.sheet(isPresented: $showingPicker,
                onDismiss: {
                    // do whatever you need here
                }, content: {
                    ImagePicker.shared.view
                })
        .onReceive(ImagePicker.shared.$image) { image in
            // This gets called when the image is picked.
            // sheet/onDismiss gets called when the picker completely leaves the screen
            self.image = image
        }
    }

}

#if DEBUG
struct ImagePicker_Previews : PreviewProvider {

    static var previews: some View {
        ImagePickerTestView()
    }
}
#endif