# How to detect a screenshot from Simulator

Last month on my project, I was working on a feature that involves detecting screenshots because it has sensitive data. At that time I didn't have a real iOS device and it got me a problem because only real devices can detect such behavior.

So here's how I did on a simulator to mimic taking screenshots.

**1 - Let's create a simple view with Button as if it is a screenshot button.
**
```
import SwiftUI

struct ContentView: View {
  
    let pub = NotificationCenter.default.publisher(for: UIApplication.userDidTakeScreenshotNotification)

    var body: some View {
        VStack {
            Text("Hello, world!")
                .padding()
            Button(action: {
                print("Button tapped")
            } ) {
                Text("Screenshot")
                    .padding()
                    .foregroundColor(Color.white)
                    .background(Color.blue)
                    .cornerRadius(15)
            }
        }.onReceive(pub, perform: { _ in
            self.detectScreenshot()
        })
    }
    
    func detectScreenshot() {
        print("Screenshot is taken")
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
``` 
**2- Let's put a breakpoint on the Button action, put the following command debug area and Press Enter.**

```
(lldb) expr NotificationCenter.default.post(name: UIApplication.userDidTakeScreenshotNotification, object: nil)
``` 

![ezgif.com-gif-maker (2).gif](https://cdn.hashnode.com/res/hashnode/image/upload/v1634452819092/a3gpWoxkA.gif)

That's about it. Easy right? <br>
You can post other notifications as well using LLDB.

Reference: https://stackoverflow.com/questions/28209538/how-to-simulate-taking-a-screenshot-in-ios-simulator