On Feb 11, 2014, at 15:58 , dangerwillrobinsondan...@gmail.com wrote: > I don't recall the title but there was a recent WWDC video that includes this > topic. > It's not a one step process but not that hard either.
Thanks. I searched asciiwwdc.com, but there are MANY videos discussing animation, and it wasn't clear which one I should watch. I'll look again when I have more time. Wish they had outlines. > > Sent from my iPhone > >> On 2014/02/12, at 8:43, Rick Mann <rm...@latencyzero.com> wrote: >> >> In my app, I annotate a floor plan with lines of arbitrary length and >> location, capped with circles (like stretchy barbells). The UZ design calls >> for collapsing these into a single circle placed at the center of the line >> when they're not being edited. There can be many (probably not more than 10 >> or 20) of these lines scattered over the floor plan. >> >> I'd like to animate the collapse and expansion of these barbells, all at a >> time. They do not live in their own views, but rather are drawn in one large >> overlay view that spans the screen, in -drawRect:. >> >> Can I leverage Core Animation, or should I just make a timer and animate it >> myself (by repeatedly calling -setNeedsDisplay on my overlay view)? >> >> I could try to make these drawn with CAShapeLayers, but during editing, the >> user can drag one end or the other around arbitrarily. A layer that just >> bounds the barbell would have to dynamically change size as the user does >> this, or be sized full-screen, which might consume a lot of memory; I'm not >> sure. >> >> -- >> Rick -- Rick
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