iphone - Apple ZoomingPDFViewer won't allow dragging until after first zoom -

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i'm using sample code view pdf in iphone app:

http://developer.apple.com/library/ios/#samplecode/zoomingpdfviewer/introduction/intro.html#//apple_ref/doc/uid/dts40010281-intro-dontlinkelementid_2

however, problem can't seem drag initially. can pinch , zoom initially, , after i've zoomed once, can drag view around fine. can't drag when view first loads.

any ideas?

i think i've figured out solution, though why doesn't work beyond me. if set zoomscale property, seems trigger whatever needed allow dragging , scrolling take place, if set property 1, nothing.

i did in initwithframe: method of uiscrollview:

... self.zoomscale = 1; ...

if else knows of better or more correct way this, or has explanation why happens, i'd know.


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