How to set NSButton's keyEquivalent to NSDownArrowFunctionKey in Swift

Question

How do I set an NSButton's keyEquivalent (which is a String type) to the down arrow key in Swift? NSDownArrowFunctionKey is an Int.

Answer 1

This page in Apple's documentation addresses this exact issue. The example they provide is written in Objective-C, the Swift equivalent is as follows:

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var window: NSWindow!
    @IBOutlet weak var button: NSButton!

    func applicationDidFinishLaunching(aNotification: NSNotification) {

        var array = [unichar(NSDownArrowFunctionKey)]
        button.keyEquivalent = NSString(characters: array, length: 1)
    }
}