Creating a global configurable shortcut for MacOS apps in Swift

import Cocoa
import HotKey
import Carbon

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    let statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)

    // Add mainPopover and eventMonitor as an instance variable
    let mainPopoverView = NSPopover()
    var eventMonitor: EventMonitor?

    func applicationDidFinishLaunching(_ aNotification: Notification) {

        if Storage.fileExists("globalKeybind.json", in: .documents) {

            let globalKeybinds = Storage.retrieve("globalKeybind.json", from: .documents, as: GlobalKeybindPreferences.self)
            hotKey = HotKey(keyCombo: KeyCombo(carbonKeyCode: globalKeybinds.keyCode, carbonModifiers: globalKeybinds.carbonFlags))
        }

        statusItem.button?.title = "⅀"

        statusItem.button?.target = self

        statusItem.button?.action = #selector(showSettings)

        // Fresh controller instance - use your view controller here
        mainPopoverView.contentViewController = MenuViewController.freshController()

        // Check if mouse is clicked outside of menu - if it is then close the popover (optional)
        eventMonitor = EventMonitor(mask: [.leftMouseDown, .rightMouseDown]) { [weak self] event in
            if let strongSelf = self, strongSelf.mainPopoverView.isShown {
                print("is shown")
                strongSelf.closePopover(sender: event)
            }
        }
    }

    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
    }

    // Add in the toggling methods
    @objc func togglePopover(_ sender: Any?) {
        if mainPopoverView.isShown {
            closePopover(sender: sender)
        } else {
            showPopover(sender: sender)
        }
    }

    func showPopover(sender: Any?) {
        if let button = statusItem.button {
            mainPopoverView.show(relativeTo: button.bounds, of: button, preferredEdge: NSRectEdge.minY)
        }
        eventMonitor?.start()
    }

    func closePopover(sender: Any?) {
        mainPopoverView.performClose(sender)
        eventMonitor?.stop()
    }



    @objc func showSettings() {

        let storyboard = NSStoryboard(name: "Main", bundle: nil)

        guard let vc = storyboard.instantiateController(withIdentifier: "ViewController") as? NSViewController else {
            fatalError("ViewController in Storyboard nicht gefunden.")
        }

        guard let button = statusItem.button else {

            fatalError("Button des Status-Items konnte nicht gefunden werden")
        }


        let popoverView = NSPopover()
        popoverView.contentViewController = vc
        popoverView.behavior = .transient
        popoverView.show(relativeTo: button.bounds, of: button, preferredEdge: .maxY)

    }


    public var hotKey: HotKey? {
        didSet {
            guard let hotKey = hotKey else {
                return
            }

            // Toggle popover 
            hotKey.keyDownHandler = { [weak self] in
                if let strongSelf = self {
                    strongSelf.togglePopover(nil)
                }
            }
        }
    }
}