ScrollView inside a dynamic Grid row won't completely scroll (iOS)

[LukeFranky]

Description

If a ScrollView is positioned inside of a Grid row with a dynamic height (RowDefinition Height="*"), it cannot be scrolled completely to the bottom.

This was not a problem in previous versions. Yet to find a workaround.

Steps to Reproduce

1. Create a new MAUI project (or use the repo).
2. Wrap the ScrollView with a Grid.
3. Add a RowDefinition with Height="100".
4. Add a RowDefinition with Height="*".
5. Set ScrollView Row="1".
6. Run the application.
7. Try to scroll to the bottom (The button will not stay visible).

Link to public reproduction project repository

https://github.com/LukeFranky/ScrollView-in-Grid-MAUI-Bug

Version with bug

7.0.86

Last version that worked well

7.0.81

Affected platforms

iOS

Affected platform versions

14.6

Did you find any workaround?

No response

Relevant log output

No response

[ritesh-burn]

Yes I'm seeing this as well. I've seen a similar issue with CollectionViews inside a Grid as well but it doesn't seem to be consistent.

[LukeFranky]

@ritesh-burn here's my current workaround. It will only work if you have one dynamically sized row, not multiple.

Seems to be such a basic thing to be broken.

    private void TemplateGrid_SizeChanged(object sender, EventArgs e)
    {
        // Fix scroll height;
        double remainingHeight = this.TemplateGrid.Height;

        foreach (RowDefinition row in this.TemplateGrid.RowDefinitions)
        {
            if (row.Height.IsAbsolute)
            {
                remainingHeight -= row.Height.Value;
            }
        }

        this.ScrollArea.HeightRequest = remainingHeight;
    }

[omghb]

Maybe this is about the same issue:

• https://github.com/dotnet/maui/issues/15163

[ritesh-burn]

Thanks @LukeFranky I will try it out. I also noticed that just setting the height to something arbitrary like CollectionView.MaximumHeightRequest = Grid.Height - 200; seems to work in most cases but still fails at times.

[faheys]

Same problem with both scroll views and collection views on iOS for me as well. Latest MAUI update (non preview) has completely borked almost everything that uses a grid and dynamic height/width values.

[ritesh-burn]

I looked at the code changes that broke this and it looks like it will go back to previous behavior if the Grid's height is fixed. So if you have a grid that covers the full height of the screen, you can do something like this as a work around and it will work like before:

    protected override void OnAppearing()
    {
        base.OnAppearing();
        Grid.HeightRequest = DeviceDisplay.MainDisplayInfo.Height / DeviceDisplay.MainDisplayInfo.Density;
    }

YMMV.