I'd like to have a better understanding of this parameter in 

+ (id)animationWithKeyPath:(NSString *)keyPath

They just say: "The key path of the property to be animated."

In some example snippets I see things like:

CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];

CAKeyframeAnimation *animatedIconAnimation = [CAKeyframeAnimation animationWithKeyPath: @"frameOrigin"];

Is there a list or rule of thumb for determining the correct key path parameter? i.e. when I want to animate the width of a frame, what kind of rules would I have to follow to get to the correct key path parameter string?

iphone core-animation cakeyframeanimation
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