useSpeaker2.swift

import Cocoa
import SpeakerFramework

class MainWindowController: NSWindowController {
    
    @IBOutlet weak var labelTextField: NSTextField!

    override func windowDidLoad() {
        super.windowDidLoad()
        let sp = Speaker()
        sp.testSpeaker()
        labelTextField.stringValue = sp.speak()
    }
    
    override var windowNibName: String {
        return "MainWindowController"
    }
}