截取混合了UIKit和OpenGL的iPhone应用的屏幕截图

Question

So, I know how to take a screenshot with UIKit:

UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
UIGraphicsBeginImageContext(window.bounds.size);
[window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

And I know how to take a screenshot with OpenGL

// Some preparation to read pixels into a buffer
glReadPixels(0,0,backingWidth, backingHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
// Some code to massage the raw pixel data into an image

My app mixes OpenGL and UIKit, so any screenshot taken with just one method doesn't look right.

What's the best way to either a) Composit the two images together or b) Take a screenshot that can capture both OpenGL and UIKit together

Answer 1

This is a similar post which has some answers. Apparently you can use either UIGetScreenImage , or glReadPixels to do this task. Hope that helps!