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Home/ Questions/Q 7187941
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T18:57:28+00:00 2026-05-28T18:57:28+00:00

I have seen ivars that are backing properties declared in 2 general formats (in

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I have seen ivars that are backing properties declared in 2 general formats (in various books, on blogs, etc…) :

myProperty = _myProperty;
myProperty = myProperty_; 

Apple docs say the former one is needed for key value compliance

Which one is most appropriate ?

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  1. Editorial Team
    Editorial Team
    2026-05-28T18:57:29+00:00Added an answer on May 28, 2026 at 6:57 pm

    The currently informal recommendation from Apple is to use an underscore prefix. There are indications that there will be syntactic conveniences for this in future.

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