Runs the alert modally as a sheet attached to the specified window.
- macOS 10.9+
The window on which to display the sheet.
The completion handler that gets called when the sheet’s modal session ends.
This method uses the
NSWindow sheet methods to display the alert (for more information, see Managing Sheets). If the alert has an alert style of
NSCritical, it is presented as a critical sheet, which means that it can display on top of other sheets that might already be attached to the window. Otherwise, it is presented—or queued for presentation—as a standard sheet.
order no longer needs to be called in the completion handler. If you don’t dismiss the alert, it will be done for you after the completion handler finishes.