ObjC compiler cannot find method in protocol

Question

I have following ObjC protocol

# import <Foundation/Foundation.h>

@protocol FutureObjC

- (void)setValue: (NSObject *_Nullable)data NS_SWIFT_NAME(setValue(_:));
- (void)setError: (NSError *_Nullable*_Nullable)error NS_SWIFT_NAME(setError(_:));

@end

And an ObjCpp method of some class, that accepts object conforming this protocol

- (void)__method:(_Nonnull id<FutureObjC>)future
{
    [future setValue: nil];
}

But I get compilation error, that there is no such method in protocol

/Users/ga.igumnov/work/sdk/build/x86_64/test/tests/test-sbis-djinni-static/src/async/djinni/objcpp/TestSBISDjinniAsync/DSAsyncTestInterface+Private.mm:94:13: error: instance method 'setValue:' not found ; did you mean 'getValue:'?
   94 |     [future setValue: nil];
      |             ^

What am I doing wrong?

Crazy Sage · Accepted Answer · 2025-07-30 11:03:21Z

0

It happens, when you have only forward declaration of protocol, but no real include to it.

answered Jul 30 at 11:03

Crazy Sage

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