# showsSuppressionButton Specifies whether the alert includes a suppression checkbox, which you can employ to allow a user to opt out of seeing the alert again. ``` var showsSuppressionButton: Bool { get set } ``` ## Discussion The default value of this property is , which specifies the absence of a suppression checkbox in the alert. Set the value to to show a suppression checkbox in the alert. By default, a suppression checkbox has the title, “Do not show this message again.” In macOS 11.0 and later, if the alert displays multiple buttons that prompt the user to make a choice, the title is “Do not ask again.” To customize it, use the checkbox’s `title` property, as follows: ```swift myAlert.suppressionButton.title = "Do not show this warning again" ``` To create an alert that responds to the selection state of the suppression checkbox, use code like that shown in Listing 1 to produce the alert shown below. Listing 1. Creating an alert with a suppression checkbox ```swift let alertSuppressionKey = "AlertSuppression" let defaults = UserDefaults.standard if defaults.bool(forKey: alertSuppressionKey) { print("Alert suppressed") } else { let anAlert = NSAlert() anAlert.messageText = "Message text." anAlert.informativeText = "Informative Text." anAlert.showsSuppressionButton = true anAlert.runModal() if let suppressionButton = anAlert.suppressionButton, suppressionButton.state == .on { defaults.set(true, forKey: alertSuppressionKey) } } ```  --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)