swift 2 OSX How can I have comboboxSelectionDidChange execute after NSComboBox.stringValue changes?

Question

Clicking UI object NSComboBox incorrectly executes comboBoxSelectionDidChange(...) before it's .stringValue changes instead of after as it's name implies. It does same as .comboBoxSelectionIsChanging.

How can I have comboBoxSelectionDidChange(...) execute after NSComboBox.stringValue actually changes?

class ViewController: NSViewController, NSComboBoxDelegate {
    @IBOutlet weak var comboBox: NSComboBox!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.usernameComboBox.delegate = self
    }

    func comboBoxSelectionDidChange(notification: NSNotification) {
        print(usernameComboBox.stringValue)
        // PRE-selected .stringValue = "ITEM 1"
        // POST-selected .stringValue = "ITEM 2"
        // selecting either item prints PRE-selected
    }
}

score 1 · Answer 1 · answered Jul 14 '16 at 14:30

1

Here is a shorter way:

     func comboBoxSelectionDidChange(notification: NSNotification) {

    guard let stringValue = usernameComboBox.objectValueOfSelectedItem as? String else { return }
    print(stringValue)
}

answered Jul 14 '16 at 14:30

Eugene Mankovski

1,180
10
16

Thanks! Just in case, any other dinosaurs out there like me, using Objective-c, it's NSLog(@"%@", _myComboBox.objectValueOfSelectedItem); – Jens Peter Jun 19 '17 at 18:17

score 0 · Accepted Answer · answered Jul 13 '16 at 16:25

Using the code below executes exactly the same as any other NSComboBoxDelegate notification function. Doesn't make sense but it works.

func comboBoxSelectionDidChange(notification: NSNotification) {
    let currentSlection = usernameComboBox.stringValue      
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
        while true {
            if self.usernameComboBox.stringValue != currentSlection {
                print(self.usernameComboBox.stringValue)
                break
            }
        }
    })
}

swift 2 OSX How can I have comboboxSelectionDidChange execute after NSComboBox.stringValue changes?

2 Answers2