Because you can't. These are the only properties you can animate:
http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/CoreAnimation_guide/Articles/AnimProps.html -Matt On Jan 16, 2009, at 10:46 AM, Adam Venturella wrote:
Basically, I was thinking: Hey, why can't I use CABasicAnimation as a means to animate just a value, not tied to a layer or a view, eg: If my CABasicAnimation duration is 1 second, and it's fromValue = 0 and it's toValue = 1 and say the interval was 100 milliseconds my value should increment by 0.10 every 100 milliseconds. So at 5 seconds my value should be 0.50 Now I could use an NSTimer to do this same thing I suppose, but I figured since Core Animation was already setup to handle things like this, why not use that. So my question is, is this even possible? Should I stop trying with this approach? Not looking for a how do I do this, more of a yes or no answer, I would like to figure it out on my own. Just want to make sure I am not barking up the wrong tree to begin with.
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