How to bind selector to method inside NSObject [duplicate] - swift

Question

This question already has an answer here:
NSStatusItem in NSStatusBar, action selector method not responding
(1 answer)
Closed 2 years ago.
In the macOS swiftui project I have the following code
import Cocoa
import SwiftUI
#NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
var window: NSWindow!
var statusItem: StatusItem = StatusItem()
func applicationDidFinishLaunching(_ aNotification: Notification) {
}
#objc public func statusBarButtonClicked(sender: NSStatusBarButton) {
let event = NSApp.currentEvent!
if event.type == NSEvent.EventType.rightMouseUp {
print("Right click! (AppDelegate)")
} else {
print("Left click! (AppDelegate)")
}
}
func applicationWillTerminate(_ aNotification: Notification) {
// Insert code here to tear down your application
}
}
import Cocoa
class StatusItem : NSObject {
private let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.squareLength)
override init() {
super.init()
self.item.button?.title = "title"
self.item.button?.action = #selector(self.statusBarButtonClicked(sender:))
self.item.button?.sendAction(on: [.leftMouseUp, .rightMouseUp])
}
#objc public func statusBarButtonClicked(sender: NSStatusBarButton) {
let event = NSApp.currentEvent!
if event.type == NSEvent.EventType.rightMouseUp {
print("Right click! (NSObject)")
} else {
print("Left click! (NSObject)")
}
}
}
But when I click NSStatusBarButton it prints "Left click! (AppDelegate)" and "Right click! (AppDelegate)" to console.
Why does it happen? And how to make it call statusBarButtonClicked method defined in StatusItem class?

Answer 1

Setting the button's action is only one half of what you need to do. You also need to specify a target. Add
self.item.button?.target = self
and I believe you will get the result you are looking for.
What's happening is action specifies the selector to invoke and target specifies the object on which to invoke it.