Question

In iPhone application I want to generate a image of UIScrollView whose content size is near about 600*41000. If I use current graphic image context to capture the scroll view layer, then it only captures the visible part of the scroll view not the whole layer of that scroll view.

I am using the below code:

{
    UIGraphicsBeginImageContext(CGSizeMake(600, 4100));
    [scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();



    UIImageView *img = [[UIImageView alloc]initWithFrame:CGRectMake(00, 100, 710, 4100)];
    img.image = viewImage;
    [anotherScrollView addSubview:img];
}

Answer 1

Try to generate image not from UIScrollView but from its content view. When you add some views to UIScrollView with something like addSubview: they become scroll’s content ones. Of course, UIScrollView can have more than one content view (just as any UIView can have more than one subview) and this case it will be more difficult to render its layer. But in case of only one subview (content view) you can use something like (contentView here is just some view, added to UIScrollView before):

[contentView.layer renderInContext:UIGraphicsGetCurrentContext()];

or:

[[[[scrollView subviews] lastObject] layer] renderInContext:UIGraphicsGetCurrentContext()];

When you want to use more than one view, it will be easier (I think) to add one more “root” view and add others as that view’s subviews: so you can also use the code above.