iOS Question ios screenshot block about

Ertan · Jul 16, 2020

Hello there,
I can block it with these codes while using Android.

B4X:

Dim nativeMe As JavaObject

-----------

nativeMe.InitializeContext
nativeMe.RunMethod("securescreen",Null)
-----------

#If Java

import android.annotation.TargetApi;
import android.content.Context;
import android.view.WindowManager.*;
public void securescreen() {
    this.getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
}

#End If

How can I prevent taking screenshots on ios phones?
Thanks.

Erel · Jul 16, 2020

See this discussion: https://www.b4x.com/android/forum/t...-least-obscure-screenshots.95690/#post-604303

The only thing you can do is to remove the views in Application_Background or add a view above all other views in that event.

Ertan · Jul 16, 2020

Erel said:
The only thing you can do is to remove the views in Application_Background or add a view above all other views in that event.

Thanks for the answer, Erel.
Can you give more detailed information?
How can a rookie do this?

Erel · Jul 16, 2020

Ignore my previous answer. It will not work. The background event is not raised in this case.

You cannot prevent screenshots in iOS.

Ertan · Jul 16, 2020

Erel said:
Ignore my previous answer. It will not work. The background event is not raised in this case.

You cannot prevent screenshots in iOS.

Is there a code for us to understand that it takes a screenshot?
Like taking msgbox when taking screenshot.

Erel · Jul 17, 2020

Only after the screenshot was taken.

Ertan · Jul 17, 2020

Erel said:
Only after the screenshot was taken.

Yes, I want to send a message after taking a screenshot.

Semen Matusovskiy · Jul 17, 2020

To detect a screenshot is simple. For example,
1) add to the bottom of Main module

B4X:

#If OBJC
- (void) DetectScreenshot
    {
     NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
    [[NSNotificationCenter defaultCenter] addObserverForName: UIApplicationUserDidTakeScreenshotNotification
       object: nil queue: mainQueue usingBlock: ^(NSNotification *note) { self._screenshot; }];
    }
#End If

2) Call this subroutine from Application_Start

B4X:

    Dim no As NativeObject = Me
    no.RunMethod ("DetectScreenshot", Null)

3) Add callback function

B4X:

Private Sub Screenshot
    xui.MsgboxAsync("Screenshot", "B4X") ' Or what you want to do
End Sub

I will not surprise, if it will be easy to remove screenshot from device.

But don't remember that bad boy can take another phone and to make a photo.

Ertan · Jul 17, 2020

Semen Matusovskiy said:
But don't remember that bad boy can take another phone and to make a photo.

Thank you, I am aware of this.

Ertan · Jul 17, 2020

Semen Matusovskiy said:
To detect a screenshot is simple. For example,
1) add to the bottom of Main module

B4X:

#If OBJC - (void) DetectScreenshot { NSOperationQueue *mainQueue = [NSOperationQueue mainQueue]; [[NSNotificationCenter defaultCenter] addObserverForName: UIApplicationUserDidTakeScreenshotNotification object: nil queue: mainQueue usingBlock: ^(NSNotification *note) { self._screenshot; }]; } #End If

2) Call this subroutine from Application_Start

B4X:

Dim no As NativeObject = Me no.RunMethod ("DetectScreenshot", Null)

3) Add callback function

B4X:

Private Sub Screenshot xui.MsgboxAsync("Screenshot", "B4X") ' Or what you want to do End Sub

I will not surprise, if it will be easy to remove screenshot from device.

But don't remember that bad boy can take another phone and to make a photo.

Thanks for the code. I run.
How can I take a screenshot of myself without pressing the keys?

Semen Matusovskiy · Jul 17, 2020

Do you mean to make a copy of the screen ? Sure, I saw samples on forum.

Well, from my archives.
Add to OBJC:

B4X:

- (UIImage*) TakeScreenshot
    {
    UIWindow* window;
    if (@available (iOS 13, *))    { window = UIApplication.sharedApplication.windows.firstObject;  } else
        { window = UIApplication.sharedApplication.delegate.window; };
    UIGraphicsBeginImageContextWithOptions (window.bounds.size, NO, 0.0);
    [window.layer renderInContext: UIGraphicsGetCurrentContext ()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext (); // this captures the screenshot
    UIGraphicsEndImageContext ();
    return image;
    }

This function returns Bitmap. You can, for example, to assign it to Imageview:

B4X:

Dim no As NativeObject = Me
ImageView1.Bitmap = no.RunMethod ("TakeScreenshot", Null)

I tested under IOS 13 only, but should work in any 8+ also.
This code does not capture "status bar' in IOS 13 (I guess the reason is that Apple removed status bar window in IOS13+).

Ertan · Jul 17, 2020

Semen Matusovskiy said:
Do you mean to make a copy of the screen ? Sure, I saw samples on forum.

Well, from my archives.
Add to OBJC:

B4X:

- (UIImage*) TakeScreenshot { UIWindow* window; if (@available (iOS 13, *)) { window = UIApplication.sharedApplication.windows.firstObject; } else { window = UIApplication.sharedApplication.delegate.window; }; UIGraphicsBeginImageContextWithOptions (window.bounds.size, NO, 0.0); [window.layer renderInContext: UIGraphicsGetCurrentContext ()]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext (); // this captures the screenshot UIGraphicsEndImageContext (); return image; }

This function returns Bitmap. You can, for example, to assign it to Imageview:

B4X:

Dim no As NativeObject = Me ImageView1.Bitmap = no.RunMethod ("TakeScreenshot", Null)

I tested under IOS 13 only, but should works in any 8+ also.

Yes, this code also works. ios 8+
But I think I was misunderstood because of the translation.
For example, on the screen pressing a button, will take a screenshot.

Our aim is to take another screenshot after the man takes a screenshot.

I am grateful to you for your help.
Is there a code example for this?

Semen Matusovskiy · Jul 17, 2020

As I understand, you want to replace previous screenshot. Not sure that it possible to do programmatically. At least, I did not saw samples.

In addition ... Screenshots is one problem. "Record Screen" (IOS built-in and separate programs) is another.
My conclusion - if user really wants, he will find a way to copy the screen, unlike all your efforts.

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