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Asked: 2026-06-02T05:45:55+00:00

I declare the object variable as a NSString But when I use the XCode

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I declare the object variable as a NSString
But when I use the XCode to look into my object, I saw there are two type of String, it seems that the system automatically transfer to another:

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What are the different between them? Are they interchangeable to one and others. Also, what is the condition two change to another?

Thanks.

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1 Answer

  1. Editorial Team

    They’re both concrete subclasses of NSString. __NSCFString is one created during runtime via Foundation or Core Foundation, while __NSCFConstantString is either a CFSTR("...") constant or an @"..." constant, created at compile-time.

    Their interfaces are private. Treat them both as NSString and you should have no trouble.

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