Status Bar Display Control in MacCatalyst

[mauisansan]

Description

I would like to use MacCatalyst to display the status bar.(The status bar refers to the area in the image below.)

I also understand that there is sample code that can be used as a reference(sample code).
However, the code is esoteric, including the use of objective-c libraries. (There is no documentation on the web for reference.)

Based on the sample code, I was able to achieve up to the display of the icon, but I am unable to implement the menu that appears when the icon is clicked. If you have technical knowledge, I would appreciate your help.

The execution environment is

mac: intel cpu
os: Ventura 13.6.1
account: admin user
.net: .net8.0.201
maui(vscode): v0.10.61

Sample code excerpts from the link

using System.Runtime.InteropServices;
using Foundation;
using ObjCRuntime;
using WeatherTwentyOne.Services;

namespace WeatherTwentyOne.MacCatalyst;

public class TrayService : NSObject, ITrayService
{
    [DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
    public static extern IntPtr IntPtr_objc_msgSend_nfloat(IntPtr receiver, IntPtr selector, nfloat arg1);

    [DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
    public static extern IntPtr IntPtr_objc_msgSend_IntPtr(IntPtr receiver, IntPtr selector, IntPtr arg1);

    [DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
    public static extern IntPtr IntPtr_objc_msgSend(IntPtr receiver, IntPtr selector);

    [DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
    public static extern void void_objc_msgSend_IntPtr(IntPtr receiver, IntPtr selector, IntPtr arg1);

    [DllImport("/usr/lib/libobjc.dylib", EntryPoint = "objc_msgSend")]
    public static extern void void_objc_msgSend_bool(IntPtr receiver, IntPtr selector, bool arg1);

    NSObject systemStatusBarObj;
    NSObject statusBarObj;
    NSObject statusBarItem;
    NSObject statusBarButton;
    NSObject statusBarImage;

    public Action ClickHandler { get; set; }

    public void Initialize()
    {
        statusBarObj = Runtime.GetNSObject(Class.GetHandle("NSStatusBar"));
        systemStatusBarObj = statusBarObj.PerformSelector(new Selector("systemStatusBar"));
        statusBarItem = Runtime.GetNSObject(IntPtr_objc_msgSend_nfloat(systemStatusBarObj.Handle, Selector.GetHandle("statusItemWithLength:"), -1));
        statusBarButton = Runtime.GetNSObject(IntPtr_objc_msgSend(statusBarItem.Handle, Selector.GetHandle("button")));
        statusBarImage = Runtime.GetNSObject(IntPtr_objc_msgSend(ObjCRuntime.Class.GetHandle("NSImage"), Selector.GetHandle("alloc")));

        var imgPath = System.IO.Path.Combine(NSBundle.MainBundle.BundlePath, "Contents", "Resources", "Platforms", "MacCatalyst", "trayicon.png");
        var imageFileStr = NSString.CreateNative(imgPath);
        var nsImagePtr = IntPtr_objc_msgSend_IntPtr(statusBarImage.Handle, Selector.GetHandle("initWithContentsOfFile:"), imageFileStr);

        void_objc_msgSend_IntPtr(statusBarButton.Handle, Selector.GetHandle("setImage:"), statusBarImage.Handle);
        void_objc_msgSend_bool(nsImagePtr, Selector.GetHandle("setTemplate:"), true);

        // Handle click
        void_objc_msgSend_IntPtr(statusBarButton.Handle, Selector.GetHandle("setTarget:"), this.Handle);
        void_objc_msgSend_IntPtr(statusBarButton.Handle, Selector.GetHandle("setAction:"), new Selector("handleButtonClick:").Handle);
    }

    [Export("handleButtonClick:")]
    void HandleClick(NSObject senderStatusBarButton)
    {
        var nsapp = Runtime.GetNSObject(Class.GetHandle("NSApplication"));
        var sharedApp = nsapp.PerformSelector(new Selector("sharedApplication"));

        void_objc_msgSend_bool(sharedApp.Handle, Selector.GetHandle("activateIgnoringOtherApps:"), true);

        ClickHandler?.Invoke();
    }
}