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POIs it possible to render AVCaptureVideoPreviewLayer in a graphics context?
 

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  1. POIs it possible to render AVCaptureVideoPreviewLayer in a graphics context?
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    <p>This seems like a simple task, yet it is driving me nuts. <strong>Is it possible to convert a UIView containing AVCaptureVideoPreviewLayer as a sublayer into an image to be saved?</strong> I want to create an augmented reality overlay and have a button save the picture to the camera roll. Holding the power button + home key captures the screenshot to the camera roll, meaning that all of my capture logic is working, AND the task is possible. But I cannot seem to be able to make it work programmatically. </p> <p>I'm capturing a live preview of the camera's image using AVCaptureVideoPreviewLayer . All of my attempts to render the image fail:</p> <pre><code> previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession]; //start the session, etc... //this saves a white screen - (IBAction)saveOverlay:(id)sender { NSLog(@"saveOverlay"); UIGraphicsBeginImageContext(appDelegate.window.bounds.size); UIGraphicsBeginImageContext(scrollView.frame.size); [previewLayer.presentationLayer renderInContext:UIGraphicsGetCurrentContext()]; // [appDelegate.window.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(screenshot, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); } </code></pre> <p>//this renders everything, EXCEPT for the preview layer, which is blank. </p> <pre><code>[appDelegate.window.layer renderInContext:UIGraphicsGetCurrentContext()]; </code></pre> <p>I've read somewhere that this may be due to security issues of the iPhone. Is this true?</p> <p>Just to be clear: <strong>I don't want to save the image for the camera. I want to save the transparent preview layer superimposed over another image, thus creating transparency.</strong> Yet for some reason I cannot make it work. </p>
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