How to convert pdf to the ipad / iphone can read the e-magazine format?

I ios rookie, seeking advice
Reply:
There is no need to convert
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I have not tried to open the pdf file directly inside ios, which are generally open
XPNot enough of, ios installed inside a support pdf reading software to try. . .


Reply:
Know pdf can directly open, but you need to make app pdf and then posted to the app store
Reply:
There are many open source libraries can be used. There are many on stackoverflow, tested, are all available.
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references, 4th Floor ybh37 reply:

have a lot of open source libraries can be used. There are many on stackoverflow, tested, are all available.

Can you elaborate or give me a URL it? Thank you.