On 8 Mar 2010, at 11:46 AM, Fritz Anderson wrote:
> I've changed the bus-stop layers from being single CATextLayers (bad layout)
> to CALayers with text sublayers). That approximately quadrupled the
> stop-related layers.
>
> Since then, the card flip has become almost instantaneous. You can see the
> edges move if you look carefully, but the visual effect of a flip is
> essentially gone.
H'm. After running a few minutes, I find that the transition is back to normal.
I'd still like to know what was causing the problem, because I take it as a
sign I don't have adequate control over my application.
A possible consideration: Transitions between routes is done on an NSTimer
handler. My route iterator does one or more synchronous downloads [NSData
dataWithContentsOfURL:], parses some XML, distributes the results among some
Core Data objects, and then updates the map layers. I don't have any control
over the responsiveness of the server.*
The point is, I'm out of the standard runloop mode for a second or so before I
start the animations and return to the runloop. Is that a possible explanation?
— F
---
* I'm aware that, to paraphrase the Frankenstein monster, "synchronous bad,
asynchronous good," but factoring my iteration and error handling into several
methods is a treat I've reserved for later.
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