How do I create a custom class from a class that already exists? (Existing class does not support NSCoding)?

What you're describing appears to be a subclass However, in Objective-C, you have the simpler option of defining a category on an existing class to add the functionality you want.

What you're describing appears to be a subclass. However, in Objective-C, you have the simpler option of defining a category on an existing class to add the functionality you want.

Perfect! Exactly what I was looking for. So I've created the .

M and . H, But I still don't know how I should handle the following: EKEvent has a few objects, such as: NSDate *_dateStamp; So when I define - (void)encodeWithCoder:(NSCoder *)coder, from Apple Documentation (regarding custom subclasses) I see that I should put: coder encodeObject:dateStamp forKey:@"dateStamp"; of course, XCode complains that the "dateStamp" object does not exist (because it is not declared in the Category). Do I just re-declare?

Would there be a problem with that (I assume there would)? – Daniel Amitay Jul 13 '10 at 1:08 The name of the field is _dateStamp, not dateStamp, and as long as you're importing the header, it should be visible. However, I would be careful not to run afoul of implementation details that might change in the future.

– Chuck Jul 13 '10 at 1:25.

What you're describing appears to be a subclass .

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