Drag & Drop Reorder Rows on NSTableView

Question

I was just wondering if there was an easy way to set an NSTableView to allow it to reorder its rows without writing any pasteboard code. I only need it to be able to do thi

Answer 1

If your are moving only one row at the time you can use the following code:

    func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {
        let pasteboard = info.draggingPasteboard()
        guard let pasteboardData = pasteboard.data(forType: basicTableViewDragAndDropDataType) else { return false }
        guard let rowIndexes = NSKeyedUnarchiver.unarchiveObject(with: pasteboardData) as? IndexSet else { return false }
        guard let oldIndex = rowIndexes.first else { return false }

        let newIndex = oldIndex < row ? row - 1 : row
        tableView.moveRow(at: oldIndex, to: newIndex)

        // Dont' forget to update model

        return true
    }