PDF View - How Can I Search Text?

I'm iphone developer and I'm developing pdf reader like iBooks.

By using CoreGraphics Framework I displayed pdf content.

But how can I implement search action and hig开发者_Go百科hlight it?

I also saw FastPdfKit and PDFKitten program. But I want the other way.

Thanks.

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take a look at this https://github.com/mobfarm/FastPdfKit