iPhone/iPad draw pdf like iBooks? -

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does know how use core graphics draw pdf in ibooks. can draw pdf page using core graphics curious how ibooks shows lower quality view of each page loads fast , when stay on page longer renders full quality. makes able open pdf without having make user wait magazine apps see on ipad. ideas help!

apple have "zoomingpdfviewer" sample code:

http://developer.apple.com/library/ios/#samplecode/zoomingpdfviewer/introduction/intro.html#//apple_ref/doc/uid/dts40010281

i suspect might give ideas :-)


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