How to programatically take a screenshot in Sprite-Kit?

Question

I've been reading resolved questions on how to programmatically take a screenshot but I can't seem to get what I've read to work in sprite kit. For instance:

This question How to take a screenshot programmatically

   UIGraphicsBeginImageContext(self.window.bounds.size);
    [self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    NSData * data = UIImagePNGRepresentation(image);
    [data writeToFile:@"foo.png" atomically:YES];

UPDATE April 2011: for retina display, change the first line into this:

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
    UIGraphicsBeginImageContextWithOptions(self.window.bounds.size, NO, [UIScreen mainScreen].scale);
else
    UIGraphicsBeginImageContext(self.window.bounds.size);

gave me this information, which I tested on my game but it didn't work because window was not recognized on an SKScene. I tried replacing it with scene but that didn't work. Any suggestions?

I also tried this:

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, scale);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Which I found in this question: ios Sprite Kit screengrab?

But it didn't seem to work either because it didn't recognize scale, or bounds in the second line.

Answer 1

This is the best solution to take a screen shoot in your Sprite-Kit

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 1);
[self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return  viewImage;