Does an Objective-C readonly property need to specify strong or copy?

Question

If I have a read-only string property, is it necessary to specify strong (or retain) or copy in the declaration? If I don\'t specify,

Answer 1

That is mostly correct. For a readonly property, strong, retain, weak, and assign have no effect. But if you also declare the property elsewhere as readwrite (most frequently in an anonymous category in the .m), then the other modifiers need to match.