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Home/ Questions/Q 8104981
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Editorial Team
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Editorial Team
Asked: June 6, 20262026-06-06T00:03:03+00:00 2026-06-06T00:03:03+00:00

@property (nonatomic, readonly) BOOL isBlabla; When speaking about properties I’m not sure what the

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@property (nonatomic, readonly) BOOL isBlabla;

When speaking about properties I’m not sure what the official name for the keywords in brackets like (nonatomic, retain) is. I have referred to them as “property modifiers” and other names but that’s probably not the correct term.

How should I call this group of keywords (nonatomic, atomic, readonly, readwrite, assign, retain, strong, etc.) that can be used in the @property brackets so that everyone knows what I’m referring to?

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  1. Editorial Team
    Editorial Team
    2026-06-06T00:03:05+00:00Added an answer on June 6, 2026 at 12:03 am

    In the closest book to me presently, they are called “property attributes”
    http://www.amazon.com/Programming-Objective-C-2-0-2nd-Edition/dp/0321566157

    A quick search of Apple’s docs yields the same word:
    https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocProperties.html

    And finally, the link to the specific section of the docs, which uses both “attributes” and your very own “keywords”: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocProperties.html#//apple_ref/doc/uid/TP30001163-CH17-SW2

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