Re: Compiler can't find method declared in protocol
Re: Compiler can't find method declared in protocol
- Subject: Re: Compiler can't find method declared in protocol
- From: Roland King <email@hidden>
- Date: Tue, 18 Dec 2012 22:41:43 +0800
If you move the protocol definition to the .h file does it help instead of just having the forward declaration.
I'm not seeing the problem here, but I would say that a protocol not defined in the .h but in the .m file is a bit unusual. That's the first thing I'd try.
On 18 Dec, 2012, at 10:31 PM, Jerry Krinock <email@hidden> wrote:
> I am so stumped as to why llvm cannot see the declaration of a method in a protocol that I have reproduced the issue in a small test project. An error or warning occurs in the last line of the following code, where I send the message to a delegate which is declared to implement the protocol.
>
> If ARC is on, I get this the error:
> No visible @interface for 'NSObject<RPTokenControlDelegate>' declares the selector 'tokenControl:renameToken:'
>
> If ARC is off, it instead appears as a warning:
> Instance method '-tokenControl:renameToken:' not found (return type defaults to 'id')
>
> In my real project, which is non-ARC, if I ignore the warning, the code runs OK.
>
> Thank you for answering what must be a simple question.
>
> Jerry Krinock
> D
> ******* JunkLib.h **********************************************
>
> #import <Foundation/Foundation.h>
>
> @protocol RPTokenControlDelegate ;
>
> @interface RPTokenControl : NSObject {
> NSObject <RPTokenControlDelegate> * m_delegate ;
> }
>
> @property (assign) NSObject <RPTokenControlDelegate> * delegate ;
>
> @end
>
>
> ******* JunkLib.m **********************************************
>
> #import "JunkLib.h"
>
> @protocol RPTokenControlDelegate
>
> - (void)tokenControl:(RPTokenControl*)
> renameToken:(NSString*)token ;
>
> @end
>
> @implementation RPTokenControl
>
> - (IBAction)renameSelectedToken:(NSMenuItem*)sender {
> [[self delegate] tokenControl:self
> renameToken:@"junk"] ; // ERROR!!
> }
>
> @end
>
>
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