Where to Set Column Width in NSTableView After Updates - notifications

Question

I managed to write a function to set the column width by max string length. I need this to prevent long strings from clipping, wrapping etc.
My problem is now, where do I put the function. In other words when do I know when the tableview finished loading or updating? I cant find any available notifications for NSTableView.
here is my func:
func columnWidthByMaxStringLength(forColumn: Int) -> CGFloat {
let table = equationTableView!
var width = 0
for i in 0...table.numberOfRows-1 {
let view = table.view(atColumn: forColumn, row: i, makeIfNecessary: true)
let size = view?.fittingSize
width = max(width, Int((size?.width)!))
}
return CGFloat(width)
}
I tried to call this function within the NSTableView delegate func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? but it is not the right place. It throws an error.

Answer 1

The width of the column can be calculated when the table view and the data are loaded, before updating the table view. You can reuse the cell view.
For example:
override func viewDidLoad() {
super.viewDidLoad()
self.data = …
self.sizeToFit(column: tableView.column(withIdentifier: NSUserInterfaceItemIdentifier("name")))
self.tableView.reloadData()
}
func sizeToFit(column: Int) {
if let view = self.tableView.view(atColumn: column, row: 0, makeIfNecessary: true) as? NSTableCellView {
let key = self.tableView.tableColumns[column].identifier.rawValue
var width = self.tableView.tableColumns[column].minWidth
for object in self.data {
view.textField?.objectValue = object[key]
let size = view.fittingSize
width = max(width, size.width)
}
self.tableView.tableColumns[column].width = width
}
}