Scrolling too fast with scroll bar results in console error

[mywristbands]

I started using this package a couple days ago, and it's pretty nice! However, I've encountered one issue.

When I scroll normally by swiping my figure up and down, everything works fine. And when I scroll by holding down on the scroll bar and moving my figure up and down, this also works fine as long as I scroll slowly.

However, if I hold on the scroll bar and move my figure up and down quickly, it results in many error messages in the console of the form Bound preference PositionPreferenceKey tried to update multiple times per frame.

Based on this SO answer, the error message is probably due to how the GeometryReader and PositionPreferenceKey interact with each other. But I'm not sure exactly how to fix it.

[gordan-glavas-codecons]

I can't repro this on my phone/Xcode (can't see the warnings no matter what I do). If you wrap the onPreferenceChange body (starts at line 131) into a DispatchQueue.main.async { }, do the warnings go away?

[mywristbands]

Thanks so much for looking into this @gordan-glavas-codecons. Unfortunately the DispatchQueue.main.async { } tip didn't help.

It took me awhile, but I did finally manage to create some sample code to help you reproduce the error. Here it is:

import SwiftUI

@main
struct RefreshableScrollViewApp: App {
  var body: some Scene {
    WindowGroup {
      TestingView()
    }
  }
}

struct TestingView: View {
  var body: some View {
    RefreshableScrollView(
      onRefresh: { done in DispatchQueue.main.asyncAfter(deadline: .now() + 3) { done() } },
      content: {
        LazyVStack {
          ForEach(0..<80) { _ in
            Menu {
              Button("Delete", role: .destructive) {}
            } label: {
              Text(Image(systemName: "ellipsis"))
            }
          }
        }
      }
    )
  }
}

To trigger the error, refresh the scroll view, and then rapidly drag the scroll bar in long strokes up and down. You should see a bunch of instances of Bound preference PositionPreferenceKey tried to update multiple times per frame appear in the console as you scroll.

[GioPalusa]

I too have this problem, but haven't found a solution yet...