ios - Mac 上 SwiftUI 中的 UIDocumentPickerViewController (macCatalyst)

Question

所以我一直在忙着将一个小的 SwiftUI iPad 应用程序“移动”到 Mac 上，我遇到了一点减速带 UIDocumentPickerViewController .
我已经包裹了UIDocumentPickerViewController在 UIViewControllerRepresentable像这样:

struct DocumentPickerView: UIViewControllerRepresentable {
  func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
    let documentPicker = UIDocumentPickerViewController(documentTypes: [(kUTTypeImage as String)], in: .import)
    return documentPicker
  }

  func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: Context) {

  }
}

并像这样显示它:

struct ContentView: View {
@State var shows = false
var body: some View {
    Button(action: { self.shows.toggle() }) {
        Text("Select File")
    }
    .sheet(isPresented: self.$shows) {
        DocumentPickerView()
    }
  }
}

在 iPad 上一切正常，


但是在 Mac 上时， UIDocumentPickerViewController不显示，我们得到这个空白模式:

Answer 1

我替换了不推荐使用的方法，并为提供的主题启动代码启用了询问权利，它可以工作。
使用 Xcode 13.3/macOS 12.2 测试

import UniformTypeIdentifiers
struct DocumentPickerView: UIViewControllerRepresentable {
  func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
    let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [UTType.image], asCopy: true)
    return documentPicker
  }

  func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: Context) {

  }
}

和演示打开标准 macOS 选择器