In the property declaration it is possible to send the “copy” attribute. You can not use copy for all objects, but for which objects is it possible to use the copy attribute?
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In the property declaration it is possible to send the “copy” attribute. You can not use copy for all objects, but for which objects is it possible to use the copy attribute?
-copyis not an attribute, it is a method. It’s OK to send-copyto any object that implements the NSCopying protocol.If you have a property, you can (should?) use the
copyattribute if the property’s type is a class that implementsNSCopying. i.e. any class that it is OK to send-copyto.