I'm noticing that whenever my -drawInContext gets called (in
response to calling -setNeedsDisplay) that there appears to be an
actual animated fade-out / fade-in of of the old content and the new
content.
I do not see this transition effect documented anywhere, so I'm
wondering if I'm doing something wrong. Or, if this is the correct
behavior, how do I turn it off?
The content of a layer is an animatable property, so by default,
changing the content will do a crossfade. It seems that applies to
custom content (drawn by -drawInContext:) as well as the "content"
property.
There are a couple ways to suppress animations. You can use the
CAContext API to disable all animations while you make your changes,
or you can use the layer's "actions" dictionary to override the
animation for the content transition.
