First, let's supply the table with some details of how it should display its content, by providing it with table column views.
Add the following method to the NSTableViewDelegate extension:
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? { //.... }
We won't add the whole implementation of this method in one go; we'll start with the code for just the first table column.
Add the following code to the tableView(NSTableView, viewFor: row:) method:
if tableColumn == tableView.tableColumns[0] { let cellIdentifier = "NameCellID" var cell = tableView.make(withIdentifier: cellIdentifier, owner: self) as? NSTextField if cell == nil { cell = NSTextField(frame: ...
