The following example is one of several I have run into recently.
Inheritance is as follows: CAKeyframeAnimation: CAPropertyAnimation :
CAAnimation. CAKeyframeAnimation has no explicit initializer or factory
method. Dudney's book uses [CAKeyframeAnimation animation] to create an
object. However, CAKeyframeAnimation has no such factory method.
CAAnimation does. Why should I assume that the "animation" factory method
will return an object of class CAKeyframeAnimation instead of CAAnimation
when it is not re-defined in CAKeyframeAnimation.h?
The docs say that CAKeyframeAnimation shoud be created with the
inherited (from CAPropertyAnimation) animationWithKeyPath factory method.
That raises the same issue.
Is there a basic assumption that such factory methods are implicitly
redefined for all subclasses?
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