如何将线宽相等的矩形绘制到NSStatusItemButton中？

import Cocoa

class CustomView: NSView {
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        guard let context = NSGraphicsContext.current?.cgContext else { return }
        
        context.setLineWidth(2.0)
        context.addRect(dirtyRect)
        context.strokePath()
    }
}

class ViewController: NSViewController {
    let statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.squareLength)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let button = statusItem.button {
            let customView = CustomView(frame: button.bounds)
            button.addSubview(customView)
        }
    }
}