No, there's no way to do that right now, CATiledLayer doesn't even
know when tiles are evicted from the cache. Probably the best thing to
do is to give your cache a maximum size and remove items after they've
been idle for some time…
John
On Mar 24, 2008, at 8:39 AM, Dmitry Pugachev wrote:
I'm writing an application that dynamically renders
contents into a large scrollable view, and I'm using
a CATiledLayer object as a content layer. It handles
tiled drawing pretty well, but I also want to be able
to synchronize it with my internal cache, which contains
temporary data for each tile being rendered.
While I can add content to this internal cache as I
render individual tiles, I can't seem to be able to
invalidate off-sceen portions of the cache when
the corresponding portions of the internal CATiledLayer
image buffer get invalidated. For example, if I scroll
down continuously, each new tile rendered would
add data to my internal cache, while the old tiles
will never get invalidated. On the other hand, I want
to be able to keep the cache size under control by
removing old content, just like CATiledLayer does
for its internal image data.
Is there a way to register a callback that will be
invoked by CATiledLayer when it internally
invalidates an outdated portion of its content?
Thanks in advance,
Dmitry
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