iphone - iOS PDF Forms & Reports -

we working on solution require ios create pdf documents various business transactions (i.e. sales orders, purchase orders, quotes, invoices, etc).

the underlying data goes pdf documents same; however, many users want own company logo , own formatted layout.

we can ship product default set of forms , dynamic way change company logo we're trying identify mechanism custom design form layout (using same underlying data model) , somehow send/update/deliver user has paid custom form development.

since pdf generation process objective c , know apple doesn't allow download code after release wondering if else had ideas on how approach issue.

edit: i'm looking somehow modularize code required pdf form layout. whether it's delivered via in-app purchase or choosing list of files on our server isn't huge concern.

you can define form template in xml , download these templates application. in application parse xml , convert pdf drawing instructions.
example xml this:

<form>     <page width="612" height="792">         <line x1="20" y1="20" x2="500" y2="20" />     </page> </form> 

this xml generate pdf file single page size 612*792 points , page content consists of single horizontal line drawn (20, 20) (500, 20).
can define xml in way want fits best needs.