WPF如何从ScrollViewer ScrollContentPresenter获得焦点

// 获取ScrollViewer
ScrollViewer scrollViewer = FindChild<ScrollViewer>(yourScrollViewerParentElement);

// 设置ScrollViewer焦点
scrollViewer.Focus();

// 获取ScrollContentPresenter
ScrollContentPresenter scrollContentPresenter = FindChild<ScrollContentPresenter>(scrollViewer);

// 设置ScrollContentPresenter焦点
scrollContentPresenter.Focus();

// 用于查找子元素的辅助方法
private T FindChild<T>(DependencyObject parent) where T : DependencyObject
{
    int childCount = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < childCount; i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(parent, i);
        if (child is T typedChild)
        {
            return typedChild;
        }
        else
        {
            T foundChild = FindChild<T>(child);
            if (foundChild != null)
            {
                return foundChild;
            }
        }
    }
    return null;
}