John Pannell <mailto:j...@positivespinmedia.com> wrote
(Thursday, March 31, 2011 3:18 PM -0600):
Don't know if this fits your objectives, but I found an excellent layer-based
solution to this: YRKSpinningProgressIndicator
https://github.com/kelan/yrk-spinning-progress-indicator-layer
John, thanks for the tip and the link. I looked at
YRKSpinningProgressIndicator and it's certainly, well, er,
elaborate! But it's gratuitous use of sublayers is way more
resource intensive that I was hoping for. My application could,
potentially, end up putting dozens of these progress spinners on
the screen at once. YRKSpinningProgressIndicator would then
create hundreds and hundreds of little tiny sublayers, one for
each "spoke". Past experience has shown that CA starts to creak
under that much load.
So I'm going with plan B, which is create a custom CALayer that
draws a single spinner "wheel" image and then rotate it using a
key-frame animation.
--
James Bucanek
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