what kind of approach should I use to implement pdf thumbs ?

Question

Hello I have to implement kind of the below design :

In the above image I have kind of thumbnail of a pdfbook pages and there are two next and previous buttons to implement the functionality of paging .

i am thinking of two options to do this

1) Do the designing with IB find the page thumbs and set them accordingly .

2) The second approach is to calculate and draw the buttons (thumbs of pages)

So what should be the best practice to implement this kind of functionality .

Thanks .