Does @property (readonly, retain) have a meaning?

XCode acc开发者_高级运维epts it. But will retain be applied when I internally set the property (no setter outside since readonly but when I initialize the value in a class method) ?

Regards, Apple92

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You might specify (readonly, retain) for a publicly-facing property, and then inside your .m, re-define it as (readwrite, retain) to be able to assign to it privately. I use this pattern myself occasionally.

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The reason to do this is to allow you to do @property (retain) in a class continuation or category. If you don't have the retain on the outer property, you will get a warning about the properties being mismatched.

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it's also nice as a form of interface documentation