在UWP中将焦点放在主页上

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    base.OnNavigatedTo(e);

    // 找到第一个可获得焦点的元素
    var firstFocusableElement = FindFirstFocusableElement(myControl);

    // 将焦点设置在该元素上
    firstFocusableElement.Focus(FocusState.Programmatic);
}

private DependencyObject FindFirstFocusableElement(DependencyObject parent)
{
    var count = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < count; i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);
        if (child is Control control && control.IsEnabled && control.Focusable)
        {
            return child;
        }
        else
        {
            var result = FindFirstFocusableElement(child);
            if (result != null)
            {
                return result;
            }
        }
    }
    return null;
}