How to detect when the user takes a screenshot
If you’re showing sensitive data it can be important to know when you’re user takes a screenshot. Snapchat, for example, automatically notifies participants in a conversation if someone takes a screenshot, effectively letting them know their privacy might have been breached.
The key is to watch for the .UIApplicationUserDidTakeScreenshot message to be posted, which will happen whenever a screenshot happens. For example, this runs a screenshotTaken() method:
NotificationCenter.default.addObserver(self, selector: #selector(screenshotTaken), name: UIApplication.userDidTakeScreenshotNotification, object: nil)And this just prints a log message instead:
NotificationCenter.default.addObserver(forName: UIApplication.userDidTakeScreenshotNotification, object: nil, queue: OperationQueue.main) { notification in
print("Screenshot taken!")
}Use whichever of those two fits your needs best.
Available from iOS 7.0
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