PHPicker in SwiftUI

README.md

Proof of concept of using PHPicker in SwiftUI. See https://codakuma.com/the-library-is-open for a full tutorial.

ContentView.swift

import SwiftUI

struct ContentView: View {
  @State private var showPhotoSheet = false
  @State private var image: UIImage? = nil

  var body: some View {
    VStack {
      Button(action: { showPhotoSheet = true }) {
        Label("Choose photo", systemImage: "photo.fill")
      }
      .fullScreenCover(isPresented: $showPhotoSheet) {
        PhotoPicker(filter: .images, limit: 1) { results in
          PhotoPicker.convertToUIImageArray(fromResults: results) { (imagesOrNil, errorOrNil) in
            if let error = errorOrNil {
              print(error)
            }
            if let images = imagesOrNil {
              if let first = images.first {
                print(first)
                image = first
              }
            }
          }
        }
        .edgesIgnoringSafeArea(.all)
      }

      if let image = image {
        Image(uiImage: image)
          .resizable()
          .aspectRatio(contentMode: .fit)
          .frame(maxWidth: 200, maxHeight: 200)
      }
    }
  }
}

PhotoPicker.swift

import SwiftUI
import PhotosUI

struct PhotoPicker: UIViewControllerRepresentable {
  typealias UIViewControllerType = PHPickerViewController

  let filter: PHPickerFilter
  var limit: Int = 0 // 0 == 'no limit'.
  let onComplete: ([PHPickerResult]) -> Void

  func makeUIViewController(context: Context) -> PHPickerViewController {
    var configuration = PHPickerConfiguration()
    configuration.filter = filter
    configuration.selectionLimit = limit
    let controller = PHPickerViewController(configuration: configuration)
    controller.delegate = context.coordinator
    return controller
  }

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

  func makeCoordinator() -> Coordinator {
    Coordinator(self)
  }

  class Coordinator: PHPickerViewControllerDelegate {

    func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
      parent.onComplete(results)
      picker.dismiss(animated: true)
    }

    private let parent: PhotoPicker

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

  static func convertToUIImageArray(fromResults results: [PHPickerResult], onComplete: @escaping ([UIImage]?, Error?) -> Void) {
    var images = [UIImage]()

    let dispatchGroup = DispatchGroup()

    for result in results {
      dispatchGroup.enter()
      let itemProvider = result.itemProvider
      if itemProvider.canLoadObject(ofClass: UIImage.self) {
        itemProvider.loadObject(ofClass: UIImage.self) { (imageOrNil, errorOrNil) in
          if let error = errorOrNil {
            onComplete(nil, error)
            dispatchGroup.leave()
          }
          if let image = imageOrNil as? UIImage {
            images.append(image)
            dispatchGroup.leave()
          }
        }
      }
    }
    dispatchGroup.notify(queue: .main) {
      onComplete(images, nil)
    }
  }
}

i can see this kind of error

2021-07-21 12:35:34.330489+1000 Test-iOS[5548:107098] [claims] Upload preparation for claim 57009F46-C1D9-4C74-89F4-9C304204B79F completed with error: Error Domain=NSCocoaErrorDomain Code=260 "The file “version=1&uuid=CC95F08C-3222-4012-9D6D-64A413D254B3&mode=compatible.jpeg” couldn’t be opened because there is no such file." UserInfo={NSURL=file:///Users/skyeluke/Library/Developer/CoreSimulator/Devices/BD930028-4DEC-4EF2-84E9-E337FC273062/data/Containers/Shared/AppGroup/23223-302B-4B84-BA5C-AEE9AA17BE8F/File%20Provider%20Storage/photospicker/version=1&uuid=CC95F08C-88C3-4012-9D6D-64A413D254B3&mode=compatible.jpeg, NSFilePath=/Users/skyeluke/Library/Developer/CoreSimulator/Devices/BD930028-4DEC-4EF2-84E9-E337FC273062/data/Containers/Shared/AppGroup/234322-302B-4B84-BA5C-AEE9AA17BE8F/File Provider Storage/photospicker/version=1&uuid=CC95F08C-3322-4012-9D6D-64A413D254B3&mode=compatible.jpeg, NSUnderlyingError=0x6000030c7150 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}
PhotoPicker error: Cannot load representation of type public.jpeg

I’m no expert but it looks like the photo being chosen isn’t actually there – how does it perform on a real device (not the simulator)?

Looks like a bug in the simulator. I can see exactly the same error in the simulator when I pick the top left standard image (even the UUID is exactly the same as above). Any other image is picked successfully. No such issue seen on the device. Neither it is seen in the simulator when UIImagePickerController is used instead.