Re: valueForKeyPath: not found in protocol
Re: valueForKeyPath: not found in protocol
- Subject: Re: valueForKeyPath: not found in protocol
- From: Gideon King <email@hidden>
- Date: Tue, 16 Nov 2010 20:43:59 +1000
AFAIK, when something is referenced as a protocol like that, the *only* methods it knows about are the ones in the protocol. If you just cast the delegate to type id, you should be OK (I have encountered similar situations where this solution worked)
[(id)delegate valueForKeyPath:...
HTH
Gideon
On 16/11/2010, at 8:35 PM, Remco Poelstra wrote:
> Hi,
>
> I've somewhat the same problem as a recent thread, but I can't fix it with what was suggested in that thread.
> I've to following class:
> #import <Foundation/Foundation.h>
> #import "AudionetCommand.h"
> #import "AudionetQueueDelegateProtocol.h"
> @interface AudionetCommandQueue : NSObject {
> id <AudionetQueueDelegate> delegate;
> }
>
> @property (nonatomic, assign) id <AudionetQueueDelegate> delegate;
> - (void) enqueueCommand:(AudionetCommand *)command;
> @end
> @implementation AudionetCommandQueue
> @synthesize delegate;
> - (void) enqueueCommand:(AudionetCommand *)command {
> //Lots of code
> if ([[delegate valueForKeyPath:@"audionetDevices.address"] isEqual: []]) {};
> }
> @end
>
> I get the warning that valueForKeyPath: is not found in the protocols. If I change the instance variable to id <AudionetQueueDelegate,NSKeyValueCoding>, I get the error that the NSKeyValueCoding protocol can not be found. If I also #import <NSKeyValueCodingProtocol.h> than that header file is not found.
> How can I fix this?
>
> Kind regards,
>
> Remco Poelstra
>
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