Swift on macOS: quit other apps

Question

I want to create a utility app for myself for macOS. It shall quit other apps. The following code does not produce errors but it also does not quit the System-Preferences-App:

func quitSettings() {
    let appToTerminate = NSWorkspace.shared.runningApplications.first(
        where: {$0.bundleIdentifier == "com.apple.systempreferences" }
    )
    if let appToTerminate  {
        appToTerminate.terminate()
    }
}

Update:

When I run this function in a simple playground it actually works! However, running it in from a SwiftUi App does still not work:

import SwiftUI
import Cocoa

@main
struct QuitApp: App {

init() {
    quitSettings()
}

func quitSettings() {
    let appToTerminate = NSWorkspace.shared.runningApplications.first(
        where: {$0.bundleIdentifier == "com.apple.systempreferences" }
    )
    if let appToTerminate  {
        print(appToTerminate.terminate()) // prints false
    }
}

var body: some Scene {
    WindowGroup {
        ContentView()
    }
}

}

Does anyone know how that can happen and how to fix it?

Answer 1

As you note in the comments, your app is sandboxed. From the docs:

Sandboxed applications can’t use this method to terminate other applications. This method returns false when called from a sandboxed application.

If you want to be able to terminate other apps, you'll need to remove sandboxing.