How to add digital signature image to pdf in ios?

Can anybody help me to solve this problem.

I am working on iphone development. This is new for me.

I need to generate a pdf with digital signature. I don't have any idea about this . I have googled past 1 week, still i am not able to crack this problem.

Please can anybody explain the step by step procedure or provide me some source code example. Also provide me some good links.

How do you add a picture of a signature to a PDF?

Click Tools -> Signature; Or Annotate on the main menu -> Signature, Or Fill & Sign-> Signature; 2. A window will pop up, then choose Image -> Select a File to add an image from a file; You can choose Remove white background from image to remove the background; 3.