Re: Unimplemented Selector Warning 3
Re: Unimplemented Selector Warning 3
- Subject: Re: Unimplemented Selector Warning 3
- From: Roland King <email@hidden>
- Date: Tue, 21 Aug 2012 23:18:27 +0800
I'm assuming it's -Wselector, if it is, then that will warn if a selector inside @selector() does not have a corresponding method in the current compilation unit. I don't know if adding an import declaring that selector is enough, if not, then Wselector is not as useful as it could be.
On 21 Aug, 2012, at 11:07 PM, Andy Lee <email@hidden> wrote:
> On Aug 21, 2012, at 2:18 AM, Gerriet M. Denkmann <email@hidden> wrote:
>
>> (I hope you don't see this more than once - some problems with Mail)
>>
>>
>> I messed around with my Build Settings - activating more warnings. (Almost) always a good idea.
>>
>> I have:
>> NSView *someSubclassOfView = ....;
>> if ( [ someSubclassOfView respondsToSelector: @selector(getRow:column:forPoint:) ] )
>> {
>> // this is a browser or a matrix or something else
>> // do something...
>> }
>>
>> And get a warning: "Unimplemented selector 'getRow:column:forPoint:'".
>
> What line is the warning coming from? If you are doing
>
> BOOL isOnCell = [someSubclassOfView getRow:&row
> column:&column
> forPoint:point];
>
> The problem might be that someSubclassOfView is declared as an NSView. You can fix with a cast:
>
> BOOL isOnCell = [(NSTableView *)someSubclassOfView getRow:&row
> column:&column
> forPoint:point];
>
>> Same problem with:
>> #import "Server.h" // declares: - (void) reset;
>> [ currentServers makeObjectsPerformSelector: @selector(reset) ];
>>
>> And:
>> #import "SomeClass.h" // declares: - (void) someMethod: something;
>> SomeClass *someClass = ...;
>> [ someClass performSelectorOnMainThread: @selector(someMethod:) withObject: nil waitUntilDone: NO ];
>
> I don't know about these. Is the warning definitely coming from the performSelector lines?
>
> What are the warnings you activated? I can try to reproduce the problem.
>
> --Andy
>
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