SwiftUIStatusItem.swift

import SwiftUI

class Coordinator: ObservableObject {
    let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)

    init() {
        let view = NSHostingView(rootView: Text("Hello from SwiftUI").fixedSize())
        item.button?.addSubview(view)
        view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            view.leadingAnchor.constraint(equalTo: item.button!.leadingAnchor),
            view.trailingAnchor.constraint(equalTo: item.button!.trailingAnchor),
            view.heightAnchor.constraint(equalToConstant: 20),
            view.centerYAnchor.constraint(equalTo: item.button!.centerYAnchor)
        ])
    }
}

struct ContentView: View {
    @StateObject var coordinator = Coordinator()
    var body: some View {
        Text("Check your status bar!")
            .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}