CODEWITHSUNDEEP
swift
ehmunnehm
ehmunnehm

Reputation: 730

NSTableView grouping

I am trying to add groups to my NSTableView. I found this function:

func tableView(tableView: NSTableView, isGroupRow row: Int) -> Bool
{
    if (row == 5)
    {
        return true;
    }

    return false;
}

Which works great. Row 5 is a group after that. But I am not sure how to add a title to that?

I am using a custom view:

func tableView(tableView: NSTableView, viewForTableColumn tableColumn: NSTableColumn?, row: Int) -> NSView?
{
    if (row == 5)
    {
        ??????
    }

    let result : CellViewCustom = tableView.makeViewWithIdentifier(tableColumn!.identifier, owner: self) as! CellViewCustom

    ...

    return result
}

But in row 5 it says tableColumn == nil

How do I add text to the group header?

Upvotes: 0

Views: 2453

Answers (1)

vadian
vadian

Reputation: 285290

Unlike in iOS, the group cells of NSTableView are "inline" in the (non-nested) data source array.

Simple example

  • A custom struct Item with property name, title and isGroup. All instances whose title is not empty are group rows

    struct Item {

  let name, title : String
  let isGroup : Bool

  init(name : String, title : String = "") {
    self.name = name
    self.title = title
    self.isGroup = !title.isEmpty
  }
}

  • Create a data source array and assign 2 group and 3 normal rows

    var items = [Item]()

...

items = [Item(name:"", title:"Group 1"), 
         Item(name:"bar"), 
         Item(name:"baz"), 
         Item(name:"", title:"Group 2"), 
         Item(name:"zab")]

  • In isGroupRow just return the value of the property

    func tableView(tableView: NSTableView, isGroupRow row: Int) -> Bool
{
  return items[row].isGroup
}

  • In viewForTableColumn create two different views for group and table row

    func tableView(tableView: NSTableView, viewForTableColumn tableColumn: NSTableColumn?, row: Int) -> NSView?
{
  let item = items[row]
  if item.isGroup {
    let groupCell = tableView.makeViewWithIdentifier("GroupCell", owner:self) as! NSTableCellView
    groupCell.textField!.stringValue = item.title
    return cell
  } else {
    let cell = tableView.makeViewWithIdentifier(tableColumn!.identifier, owner: self) as! CellViewCustom

    ...

    return cell
  }
}

Upvotes: 3

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