Set menubar icon from ViewController

Question

How to change the menubar icon of a MacOS app from another ViewController?

• AppDelegate.swift (inits menubar icon)
• ViewController.swift (tries to set menubar icon ❌)

I found this but this isn't changing the menubar icon for me: Mac: How to save alternate app icon in dock OSX xcode

let image = NSImage.init(named: NSImage.Name(rawValue: "AltAppIcon"))
NSApp.applicationIconImage = image

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See how the BOINC icon has the little custom pause symbol/badge in the bottom right of it's menubar? This app's icon changes. Are they writing over the name of that file and changing it to the "paused icon" image maybe?

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✅UPDATE*

A AppDelegate.swift function that set the menubar icon worked:

AppDelegate.swift

func setIcon() {
  let onIcon = NSImage(named: "fv-mini-icon-green")
  statusItem.button?.image = onIcon
}

ViewController.swift

func taskOnIcon() {
  DispatchQueue.main.async(execute: {
    let appDele = NSApplication.shared.delegate as! AppDelegate
    appDele.setIcon()
  })
}

Answer 1

Here is a way...

class AppDelegate: NSObject, NSApplicationDelegate {
    var statusBarItem: NSStatusItem!

    func applicationDidFinishLaunching(_ aNotification: Notification) {

        let statusBar = NSStatusBar.system
        statusBarItem = statusBar.statusItem(withLength: 16)

        let button = statusBarItem.button
        button?.image = NSImage(named: "fv-mini-icon-green")

    // .. other code here