iOS Question Prevent screenshot iOS

[tsteward]

Is there a B4i version of this code

Private Sub Application_Start (Nav As NavigationController)
   NavControl = Nav
   Page1.Initialize("Page1")
   Page1.Title = "Page 1"
   Page1.RootPanel.Color = Colors.White
   NavControl.ShowPage(Page1)
   Dim no As NativeObject = Me
   no.RunMethod("addListener", Null)
End Sub

#if OBJC
- (void)addListener {
  [[NSNotificationCenter defaultCenter] addObserver:self
  selector:@selector(_screenshot_taken)
  name:UIApplicationUserDidTakeScreenshotNotification  object:nil];
}
#end if

Private Sub Screenshot_Taken
   Log("Screenshot taken")
End Sub

I did find this when search www

You cannot directly block UIApplicationUserDidTakeScreenshotNotification from firing to prevent a screenshot; it only notifies you after it happens. To actually prevent screen capture, you must apply isSecureTextEntry to a hidden UITextField, which tricks iOS into masking the screen with black.

Implementation in Objective-C
To secure a specific view, use a UITextField set to secureTextEntry.

#if OBJC
- (void)preventScreenCapture {
// 1. Create a UITextField
UITextField *field = [[UITextField alloc] init];
field.secureTextEntry = YES;

// 2. Add to your current view
[self.view addSubview:field];

// 3. Make the secure layer cover your desired content
// Typically requires setting up constraints to fill the screen/view
field.layer.sublayers.firstObject.delegate = self;

// 4. Hide the text field itself
field.hidden = YES;
}
#endif

 

[Erel]

I tried the suggestion with a hidden text view. It doesn't seem to work on iOS 26.

TextView1.As(NativeObject).SetField("secureTextEntry", True)

The field itself will not appear in the screenshot (if visible).

Maybe you can hide the content when the app moves to the background or in one of the other page events.

 

[tsteward]

Okay thank you