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Asked: 2026-06-02T05:54:01+00:00

I have a class/super class pair declared thus: @class WSStatement; @interface WSIfStatement : WSStatement

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I have a class/super class pair declared thus:

@class WSStatement;
@interface WSIfStatement : WSStatement
@property (nonatomic, retain) WSStatement *thenstatement;
@end

I create an instance of the subclass using Core Data and assign it to a WSStatement * pointer (i.e. the super class). At some later point I want to send a message to the object that is specific to the subclass, and the compiler is giving me a warning saying “instance method not found (return type defaults to ‘id’)”

I have tried casting like this ….

[(WSIfStatement *)statement setThenStatement:aVariableParameter];

but the warning persists. The program executes perfectly, but I can’t rid myself of the pesky compiler warning. I couldn’t find a complete formal Objective-C syntax description anywhere, so I apologise if the answer is obvious!!

Thanks

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1 Answer

  1. Editorial Team

    If it is not a typo then the problem is you are calling the wrong method.

    @property (nonatomic, retain) WSStatement *thenstatement;

//Will be called with a lowercase s for statement
[(WSIfStatement *)statement setThenstatement:aVariableParameter];

    Also you can not just forward declare a class that you inherit from. You will need to include the header for WSStatement. And if you still have an error make sure you synthesize thenstatement in the implementation.

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