Re: valid method generates warning
Re: valid method generates warning
- Subject: Re: valid method generates warning
- From: Matt Gough <email@hidden>
- Date: Mon, 16 Mar 2009 16:23:20 +0100
OK, the next thing I would suggest is to run the Preprocess command
(Build > Preprocess) on the file that generates the warning and see
where totalNumberOfForks first appears in the output.
Matt
On 16 Mar 2009, at 16:18, Julian Blow wrote:
Dear Matt,
yes, the declaration
- (unsigned int)totalNumberOfForks;
comes directly before another method declaration that is correctly
identified in the @interface block.
Thanks for the suggestion though.
Julian
Prof. J. Julian Blow, FRSE
Wellcome Trust Centre for Gene Regulation & Expression
College of Life Sciences, University of Dundee
Dow Street, Dundee DD1 5EH, UK
Tel: (+44) (0)1382-385797 Fax: (+44) (0)1382-388072
E-mail: email@hidden
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On 16 Mar 2009, at 15:13, Matt Gough wrote:
A simple question - Is the - (unsigned int)totalNumberOfForks
method actually declared in the @interface section of
JBForkController? It is possible that you have just added its
implementation without adding it to the header. (Obj-C nicely
allows that)
Matt
On 16 Mar 2009, at 16:02, Julian Blow wrote:
Dear all,
apologies if this is trivial, but I have spent hours on this
problem and cannot find a way forward...
I have implemented a method:
- (unsigned int)totalNumberOfForks
in a class called JBForkController. I know this method works as
another method in the JBForkController class successfully calls
it, giving no compiler errors. When called within the
JBForkController class, as:
[self totalNumberOfForks];
the method name is shaded dark blue.
I have another class called JBSPhaseController which #imports
JBForkController.h. JBSPhaseController has an instance variable
declared in the header file as JBForkController*
theForkController. As expected if JBForkController.h were
correctly imported, the name JBForkController in this statement is
shaded purple.
In one of the JBSPhaseController method implementations, various
methods are called on theForkController. As expected, most of
these method names are shaded dark blue. However, in the statement:
stalledForkSteps+=[theForkController totalNumberOfForks];
totalNumberOfForks is shaded grey and generates a compiler error:
warning: 'JBForkController' may not respond to '-
totalNumberOfForks'.
In the problem statement, theForkController is shaded pale blue to
indicate it is recognised as a valid ivar. I have typed and re-
typed the totalNumberOfForks method name many times, all to no
avail. I know it is a valid method call, because when I run the
program in Debug, I can see that the totalNumberOfForks message is
correctly called on this line. If I command-double-click on the
name totalNumberOfForks in this statement, instead of getting a
little box giving me the relevant line numbers in the .h and .m
files for JBForkController (which is what I get for other
JBForkController methods called in this programme block), a new
window opens up showing JBForkController.m at the
totalNumberOfForks method. So it seems XCode can link the method
name to the .m file, but is somehow not seeing it in the .h file.
But if I command-double-click on the totalNumberOfForks method
name in its declaration in JBForkController.h, I also open up
JBForkController.m at the totalNumberOfForks method, suggesting
that the .h file links properly to the method implementation.
This is only a warning, and the program executes perfectly, but it
still worries me. What on earth could cause it? I have cleaned the
whole project many times, and even trashed my XCode preferences
file, but still the problem recurs. The only thing that occurs to
me is that the whole program has rather a large number of
different classes that #import each other in complex ways. Could
that be a cause? If it's of relevance, I'm running XCode 3.0 and
OS X 10.5.6.
Thanks in advance,
Julian Blow
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