Display large PDF using iPhone SDK

I was wondering what is the best way 开发者_开发技巧to display a big PDF file (it's a map actually) using iPhone SDK (the file is around 5MB), because it's really slow in a UIWebView.

I want to be able to scroll through the PDF and zoom in/out.

Also do you think that it would be better to convert it to a PNG?

Thank in advance

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You can display the PDF using quartz it is faster, but it requires more code to handle it. You can download the quartz example from Apple. The only drawback I have seen is that zooming isn't as smooth.