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Editorial Team
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Asked: 2026-05-25T03:42:59+00:00

It seems that if you develop for Mac OS, NSObject has the isSubclassOfClass method.

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It seems that if you develop for Mac OS, NSObject has the isSubclassOfClass method. But when I check the iOS class reference for the same class, it does not have the method (and Xcode complains about the method).

My current solutions is to put a method -(void)iAmClassB in there, and perform a respondsToSelector:iAmClassB, but that seems contrived. Am I missing something?

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  1. Editorial Team

    It is available from iOS 2.0 and later version SDK

    if ([ClassB isSubclassOfClass:[ClassA class]]) {


    NSLog(@"yes ClassB is SubclassOfClass of ClassA");

}

    Documentation:

    isSubclassOfClass:

    Returns a Boolean value that indicates whether the receiving class is
    a subclass of, or identical to, a given class.

       + (BOOL)isSubclassOfClass:(Class)aClass

    Parameters

    aClass

    A class object.

    Return Value

    YES if the receiving class is a subclass of—or identical to—aClass,
    otherwise NO.

    Availability

    Available in iOS 2.0 and later.

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