Alternative to PDF on iPad

I have to create a PDF reader for Ipad, so i read about CGPDFdocument and UIWebView. In my opinion CGPDFDocument is too complex(i need to mange link) and using a UIWebView i can't customize behavior.

Is there an alternative way to build that? Per开发者_JS百科haps a way to convert PDF to another format like ebook ? Thank you !

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What's hard about CGPDFDocument? Apple's example in the Quartz2D programming guide is only 30 lines long.