yes, you're describing what i want. the problem is that a subview (page) of the main scrollview only calls -drawLayer:inContext: if the user flips to a page, thus that particular page moving into the view/becoming visible. additionally, if the user scrolls through the pages very fast, no content is visible until all CATiledLayers of a page's content gets drawn calling the above method. I am using CATiledLayers to improve performance during drawing and zooming (each page can be zoomed, additionally).
rather difficult to explain, actually. hope that was clear? i think about adding/removing subviews like you do in your app - but what about performance if the user scrolls fast? thanks! - m 2010/6/23 Matt Neuburg <m...@tidbits.com>: > On Wed, 23 Jun 2010 14:27:43 +0200, Martin Gla? <glas...@googlemail.com> > said: >>i am developing an ipad app which offers a full screen UIScrollView which >>itself has several subviews, representing the pages the user can flip >>through. >>problem is: every subview renders a pdf page and does so on-demand, lazy, >>when it slides into view. >>i would like the subview right and left from the currently visible view >>being pre-rendered (like facebook's app does in galleries) so that the user >>doesn't see all the CATiledLayers be fading in. > > This might not be any help, because I might not be understanding the problem > correctly. But... > > I have an app where the user scrolls between hundreds of "pages" in a paged > scroll view, but only three of them are ever drawn at any one moment: the > one the user is looking at, and the ones to the right and left of that. > Every time the user scrolls by a page, I rip out all others and put in the > new left or right as needed. > > Thus I don't understand why you don't just let "lazy" mean what I mean above > - i.e., "render it when it is the subview right or left from the currently > visible view" rather than waiting until "it slides into view". It isn't > "offscreen" if it's being drawn into the scroll view's content. > > Also, although I have not checked this, the ScrollViewSuite example might be > useful here. > > m. > > -- > matt neuburg, phd = m...@tidbits.com, <http://www.tidbits.com/matt/> > A fool + a tool + an autorelease pool = cool! > AppleScript: the Definitive Guide - Second Edition! > http://www.tidbits.com/matt/default.html#applescriptthings > > > > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
