Create new column cell on button click outlineview

问题

I have an outlineview which displays list of data items. Attaching code and screenshot below. When I click on "Create New" button added to cell, I want to add a new item below selected cell.Any help?

@IBAction func CreateFolderClicked(_ sender: Any) {
    let newMember = CubeData()
    let newIndex = selectedItemIndex
    let parent = foldersOutlineView.parent(forItem: foldersOutlineView.item(atRow: selectedRow))
    if let parentTemp = parent as? CubeData{
        let Temp = newMember.initWithNodeName(appName: "Testing", parent: parentTemp)
        newMember.addFolder(folder: Temp)
        foldersOutlineView.insertItems(at: newIndex, inParent: parentTemp.node, withAnimation: .slideDown)
        foldersOutlineView.reloadData()
    }

来源：https://stackoverflow.com/questions/65612055/create-new-column-cell-on-button-click-outlineview