gistfile1.m

- (UIImage *) screenImage:(UIView *)view rect:(CGRect)rect {
    CGPoint pt = rect.origin;
    UIImage *screenImage;

    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextConcatCTM(context, CGAffineTransformMakeTranslation(-(int)pt.x, -(int)pt.y));
    [view.layer renderInContext:context];
    screenImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return screenImage;
}