fix: resolve memory leak issue when update menu on macOS (#66)

Author: anserme

packages/tray_manager/macos/Classes/TrayManagerPlugin.swift

@@ -194,12 +194,12 @@ public class TrayManagerPlugin: NSObject, FlutterPlugin, NSMenuDelegate {
         let args:[String: Any] = call.arguments as! [String: Any]
 
         trayMenu = TrayMenu(args["menu"] as! [String: Any])
-        trayMenu?.onMenuItemClick = {
-            (menuItem: NSMenuItem) in
+        trayMenu?.onMenuItemClick = { [weak self] (menuItem: NSMenuItem) in
+            guard let strongSelf = self else { return }
             let args: NSDictionary = [
                 "id": menuItem.tag,
             ]
-            self.channel.invokeMethod(kEventOnTrayMenuItemClick, arguments: args, result: nil)
+            strongSelf.channel.invokeMethod(kEventOnTrayMenuItemClick, arguments: args, result: nil)
         }
         trayMenu?.delegate = self
 

packages/tray_manager/macos/Classes/TrayMenu.swift

@@ -52,9 +52,9 @@ public class TrayMenu: NSMenu, NSMenuDelegate {
             case "submenu":
                 if let submenuDict = itemDict["submenu"] as? NSDictionary {
                     let submenu = TrayMenu(submenuDict as! [String : Any])
-                    submenu.onMenuItemClick = {
-                        (menuItem: NSMenuItem) in
-                        self.statusItemMenuButtonClicked(menuItem)
+                    submenu.onMenuItemClick = { [weak self] (menuItem: NSMenuItem) in
+                        guard let strongSelf = self else { return }
+                        strongSelf.statusItemMenuButtonClicked(menuItem)
                     }
                     self.setSubmenu(submenu, for: menuItem)
                 }