Xamarin Forms ScrollView单击始终将焦点设置在子网格的第一项上

var scrollView = new ScrollView();
var tapGestureRecognizer = new TapGestureRecognizer();
tapGestureRecognizer.Tapped += (s, e) =>
{
    // 在此处编写代码以将焦点设置在子网格的第一项上
};
scrollView.GestureRecognizers.Add(tapGestureRecognizer);

var grid = FindFirstChild<Grid>(scrollView);

if (grid != null && grid.Children.Count > 0)
{
    var firstItem = grid.Children[0];
    firstItem.Focus();
}

private T FindFirstChild<T>(VisualElement element) where T : VisualElement
{
    if (element is T)
    {
        return (T)element;
    }

    if (element is Layout<View> layout)
    {
        foreach (var child in layout.Children)
        {
            var result = FindFirstChild<T>(child);
            if (result != null)
            {
                return result;
            }
        }
    }

    return null;
}