Is there any framework to highlight text on pdf file after rendering on the iphone

I am trying to work on searching a word on the pdf which is rendered through the drawLaye开发者_如何学Cr. Can any one suggest how I should find a word on a pdf and the position (co-ordinates) of the word on the page? Is there any free framework to import or any libraries available? After spending more time with google I found some samples to search a word on pdf; those are fastsamplepdf from github, random ideas

MY WORK

I seen fastsample pdf code; I understood only the parsing of the pdf to text using

+(MFDocumentManager *)documentManagerWithFilePath:
    (NSString *)filePath; 

and

-(NSString *)wholeTextForPage:
    (NSUInteger)pageNr withProfile:(MFProfile *)p;

But I can't find how they are highlighted. Please can any one help me out with this. Please post some suggestions. Thank you.

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Refer

PDF search on the iPhone

PDF Manipulation on iPhone SDK

Which are the pdf operators needed to do a search feature in a PDF in iphone sdk?