NEW! Master Swift design patterns with my latest book! >>

How to detect when the user takes a screenshot

Paul Hudson       @twostraws

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: .UIApplicationUserDidTakeScreenshot, object: nil)

And this just prints a log message instead:

NotificationCenter.default.addObserver(forName: .UIApplicationUserDidTakeScreenshot, object: nil, queue: OperationQueue.main) { notification in
    print("Screenshot taken!")
}

Use whichever of those two fits your needs best.

Available from iOS 7.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Help support Hacking with Swift

This site is funded by Hacking with Swift supporters who buy my e-books. If you can, please support my work – it comes packed with bonus material!

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>