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I'm using an NSTableView (and DifferenceKit, but that's likely irrelevant). This is all programmatic, no Interface Builder at all. I'd previously implemented only tableView(_:objectValueFor:row) in order to get values into my table. At that point I could apply full and partial reloads and everything worked fine. Now I've added an implementation of tableView(_:viewFor:row:) in order to format some columns differently, and it's affected reloading. A full reloadData() still works, but a call to reloadData(forRowIndexes:columnIndexes) doesn't call either my datasource or delegate methods; the reload seems to simply disappear. I also tried removing the datasource method and running only with tableView(_:viewFor:row:) but no dice. A partial reload still doesn't call the delegate method. Has anyone come across this? Is there a nuance of NSTableView I'm missing? My (truncated) code: init() { ... tableView.dataSource = self tableView.delegate = self myColumnDefinitions.forEach { tableView.addTableColumn($0) } } func tableView( _ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int ) -> Any? { ... return someStringProvider(column, row) } func tableView( _ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int ) -> NSView? { ... let identifier = someDerivedValue(column) if let existingView = tableView.makeView(withIdentifier: identifier, owner: self) as? NSTableCellView { existingView.textField?.stringValue = someStringProvider(column, row) return existingView } let textField = NSTextField() ... textField.stringValue = someStringProvider(column, row) let view = NSTableCellView() view.identifier = identifier view.addSubview(textField) view.textField = textField view.addConstraints([ ... (pin textField to view) ]) textField.bind( .value, to: view, withKeyPath: "objectValue", options: nil ) return view }

Am I missing something, or has the option to keep Simulator windows on top disappeared in Xcode 9? I used to have that setting on all the time and it is playing havoc with my muscle memory!