Hi All,
I'm in the process of learning Cocoa/Objective-C and I'm writing some
stuff for the iPhone as an exercise.
I am writing a simple application based on the "Utility Application"
iPhone Template with the latest SDK Beta 8. This is a simple 2 view
application with a routine called "toggleview" that sets up an
animation between the 2 views to do a
"UIViewAnimationTransitionFlipFromRight" transition.
The issue arrises when one view has lots of UIButtons (>40) WITH
active background images set with code like .....
[self setBackgroundImage:[UIImage imageNamed:@"blank_37.png"]
forState:UIControlStateNormal];
Where "self" is a UIButton derived custom class.
As the number of buttons increases the animation processing slows down
to the point that there is no animation and it approaches 2 frames of
animation - first frame and last frame (ie no perceived animation).
I have proved it is the images in the buttons because performance is
great with just a background colour set (no images), I can also see
the animation render at very low frame rates if I significantly
increase the transition time, and performance increase the fewer
buttons with images there are.
So my question is - given I don't want to reduce the number of
buttons, and I want the images for eye candy reasons, is there
anything I can do to improve performance of the core animation
transition?
Tx
Richard
PS. This is running in the simulator on an Intel Macbook Pro with 2GB
of memory and not iPhone natively (I couldn't get into the developer
early access)
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