swiftuiios14widgetkit

iOS WidgetKit: remote images fails to load

I'm observing a bizarre thing: in the new widgets far too often remote images are not being displayed even though the image has been successfully loaded and placed in cache.

For image downloading I've tried:

All of them indicate that image loading succeed, but the actual widget is not showing it.

struct TestWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        WebImage(url: URL(string: "https://miro.medium.com/max/3840/0*TLqp5Uwavd-U_xrs.jpg"))
                        .onSuccess()
                        .resizable()
    }
}

On the second run of the debugger - with image loading from cache - I get the image displayed, but never(?) on initial run.

It feels like that in onSuccess I need to trigger UI-invalidation? But how?

(Since it happens to literally every image-lib I try - I don't think that it's something off in the libs)

Environment:

Solution

  • Yes, as mentioned by Konstantin, it is not supported to load images asynchronously. There are 2 options to load network image in widgets

    1. Either fetch all the images in TimelineProvider and inject them to the views directly.

      OR

    2. Use Data(contentsOf: url) to fetch the image. This way it still fetches them synchronously but the code is cleaner. Sample code -

      struct NetworkImage: View {

  let url: URL?

  var body: some View {

    Group {
     if let url = url, let imageData = try? Data(contentsOf: url), 
       let uiImage = UIImage(data: imageData) {

       Image(uiImage: uiImage)
         .resizable()
         .aspectRatio(contentMode: .fill)
      } 
      else {
       Image("placeholder-image")
      }
    }
  }

}

    This view can simply be use like this -

    NetworkImage(url: url)