Screenshot a UIView subsection in an UIImage

gistfile1.txt

// Inspired by https://gist.github.com/nitrag/b3117a4b6b8e89fdbc12b98029cf98f8

+ (UIImage *)imageFromView:(UIView *)view subsection:(CGRect)subRect
{
    // Image will be sized to the smaller rectangle
    UIGraphicsBeginImageContextWithOptions(subRect.size, YES, 0);

    // The primary view needs to shift up and left so the desired rect is visible
    // But the rect passed below needs to be sized to the view, otherwise the image is compressed
    CGRect drawRect = CGRectMake(-subRect.origin.x, -subRect.origin.x, view.bounds.size.width, view.bounds.size.height);

    [view drawViewHierarchyInRect:drawRect afterScreenUpdates:NO];  // I got compiler complaints using YES ???

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}