How to capture textfield input from NSTextField

Hello:

I want to capture the input value in a text field into a variable. Here is my code:

var window: NSWindow?
   
    func checkGroupName() {
        let alert = NSAlert()
        alert.messageText = "Please enter your group name"
        alert.addButton(withTitle: "Save")
        alert.addButton(withTitle: "Cancel")

        let inputTextField = NSTextField(frame: NSRect(x: 0, y: 0, width: 300, height: 24))
        inputTextField.placeholderString = ("Enter your group name")
        alert.accessoryView = inputTextField
        alert.runModal()
        let object = NSTextField()
     let value = object.stringValue
     print("The value of Group Name is \(value)")

}

What should I add to the above code to get the value entered in a variable i can use later in the code? "value" above is empty.