SwiftUI：UIViewRepresentable 小部件预览

Question

To get a preview of a UIViewRepresentable struct, I have the following code:

import SwiftUI
import WidgetKit

struct ViewRepresentable: UIViewRepresentable {
  func makeUIView(context: Context) -> UIView {
    return UIView()
  }

  func updateUIView(_ uiView: UIView, context: Context) {

  }

  typealias UIViewType = UIView
}

struct ViewRepresentable_Previews: PreviewProvider {
  static var previews: some View {
    ViewRepresentable().previewContext(WidgetPreviewContext(family: .systemSmall))
  }
}

It outputs the following diagnostics.

RemoteHumanReadableError: Failed to update preview

invalid TimelineEntries

The error is "Cannot preview in this file – Failed to update preview"

How do you solve this error?

Answer 1

UIKit views wrapped in UIViewRepresentable will not work in WidgetKit.

Source: https://developer.apple.com/forums/thread/653471?answerId=619627022#619627022