Add completion handler to presentViewControllerAsSheet(NSViewController)?

Question

I am attempting to present a sheet configuration view (AddSoundEffect) for my main window/view controller (I\'m using storyboards), and when the configuration view

Answer 1

The easiest way to detect sheet opening or closing is to use the Sheet Notifications:

class ViewController: NSViewController, NSWindowDelegate {

    override func viewDidLoad(){
        NSApplication.sharedApplication().windows.first?.delegate = self
    }
    func windowDidEndSheet(notification: NSNotification) {

    }
    func windowWillBeginSheet(notification: NSNotification) {

    }
}