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Editorial Team
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Asked: 2026-05-18T08:32:01+00:00

I have this inside a class [delegate performSelector:@selector(doStuff:) withObject:myObject afterDelay:2.0]; and I am having

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I have this inside a class

[delegate performSelector:@selector(doStuff:) withObject:myObject afterDelay:2.0];

and I am having this error

warning:
‘-performSelector:withObject:afterDelay:’
not found in protocol(s)

I cannot figure out what may be wrong.

any clues?

thanks.

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1 Answer

  1. Editorial Team

    Your problem is that you’ve declared your delegate instance variable as:

    id<SomeProtocol> delegate;

    Right? Well, that means that the compile-time checker is only going to look for methods in the <SomeProtocol> protocol. However, performSelector:withObject:afterDelay: is declared on NSObject. This means that you should declare the ivar as:

    NSObject<SomeProtocol> * delegate;

    This is saying that it must be an NSObject that conforms to <SomeProtocol>, as opposed to any object that conforms to <SomeProtocol>. This should get rid of your warning, and you don’t have to do any casting.

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