Thank you all for the msgs - a simple call to setNeedsDisplay /
needsDisplayOnBoundsChange = YES is doing the trick. FYI - the
retain was simply a carry over from desperation and should have been
removed from the spike code.
This needs to be retained somewhere. Otherwise, it gets released
after
the first run through the run loop (which would explain why your
delegate is never called!).
when you add the layer to the view it'll get retained.
The problem in this case is that layers do not automatically 'draw'
the content using the delegate methods. You must explicitly call the
setNeedsDisplay method (or set that it needs display on bounds
change, but in this case that isn't necessary)
calling setNeedsDisplay causes the delegate method to be called and
the data to be cached. that cached data is then used as the
'content' for the layer.
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