nswindow - How to check whether a certain window is open swift

Question

I want to present a window programmatically when a button is pressed. But currently the issue is that after the window is open, if I press the button for a second time a second window opens. I want to change this behaviour to bring the window to focus on the second press.

Here is my current code.

        let storyboard = NSStoryboard(name: NSStoryboard.Name("Main"),bundle: nil)
        let controller = storyboard.instantiateController(withIdentifier: NSStoryboard.SceneIdentifier("windowController")) as? NSWindowController
        controller?.showWindow(self)

Answer 1

等待大神答复