CODEWITHSUNDEEP
objective-c
jAckOdE
jAckOdE

Reputation: 2500

How to check if a class level method is in superclass or in subclass in Objective C?

I have class tructure like this

@interface SuperClass: NSObject
+ (void) someName;
@end


@interface MyClass: SuperClass

@end

There is the case that i only want to call the someName if it is a class method of MyClass not MyClass's superclass. Since [[MyClass class] respondsToSelector:@selector(someName)] return YES if a class or its super response to the selector. How to tell that MyClass doesnt contain tosomeName?

In my application i want to print the string that contains chains of string return from a class method.

Take abve class structure as a example, i want to print something like:

somenameFromSuper.somenameFromClass.someNameFromeSubClass.

if a class doesnot implement someName method, i want to replace it by `notavailable, for ex:

somenameFromSuper.notavailable.someNameFromeSubClass.

Upvotes: 1

Views: 106

Answers (1)

Amin Negm-Awad
Amin Negm-Awad

Reputation: 16650

_Bool class_implementsMethodForSelector( Class cls, SEL selector )
{

    unsigned methodsCount;
    Method* methods = class_copyMethodList(cls, &methodsCount);
    for (unsigned methodIndex=0; methodIndex<methodsCount; methodIndex++)
    {
        if (method_getName(methods[methodIndex]) == selector)
        {
            break;
        }
    }

    free(methods);
    return  methodsIndex<methodsCount;
}

…

Class classToTest = …;
classToTest = object_getClass(classToTest); // For checking class methods
if (class_implementsMethodForSelector(classToTest, @selector(someName))
{
    …
}
else
{
    …
}

Typed in Safari.

Edit: Made a function of it. Still typed in Safari.

Upvotes: 4

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