The docs are a clear a mud on this. What do you get from CALayer's
defaultValueForKey? Is this the same as one would expect from valueForKey
for an NSDictionary? The return type is "id".
" If this method returns nil a suitable ³zero² default value for the
property is provided, based on the declared type of the key. For example, if
key is a CGSize object, a size of (0.0,0.0) is returned. For a CGRect an
empty rectangle is returned. For CGAffineTransform and CATransform3D, the
appropriate identity matrix is returned."
What does that mean? If you want a CGSize, does that mean you have to
use "sizeValue" on what is returned and convert it? Or "CGSizeValue"? But
wait, that's an iPhone SDK extension. Why isn't that in Cocoa?
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