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Compile warnings according to method order

Subject: Compile warnings according to method order
From: Martin Kyte <email@hidden>
Date: Fri, 10 Aug 2007 09:57:07 +0100
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi Guys A question from a beginner. I am working through Aaron Hillegas's book and have just got the first stages of a cocoa document based application running. In order to acheive undo and redo functionality it uses key value observing. The project compiles with no errors and runs correctly when I write

@implementation MyDocument
- (id)init
{
    ..stuff
}

- (void)startObservingPerson:(Person *)person
{
	[person addObserver:self
			 forKeyPath:@"personName"
				options:NSKeyValueObservingOptionOld
				context:NULL];
	
	[person addObserver:self
			 forKeyPath:@"expectedRaise"
				options:NSKeyValueObservingOptionOld
				context:NULL];
	
}

- (void)stopObservingPerson:(Person *)person
{
	[person removeObserver:self forKeyPath:@"personName"];
	[person removeObserver:self forKeyPath:@"expectedRaise"];
}

// . . . . . . . . then the rest of the code

but not when

- (void)startObservingPerson:(Person *)person
{
	...... etc.......
}

- (void)stopObservingPerson:(Person *)person
{
 .... etc....
}

is placed after methods with
[self startObservingPerson:p];
or
[self stopObservingPerson:person];

I thought in my simple understanding methods could go in any order. warnings look like this and the application indeed does not respond as it should

Building target “RaiseMan” of project “RaiseMan” with configuration “Debug” — (3 warnings)

 'MyDocument' may not respond to '-stopObservingPerson:'
 'MyDocument' may not respond to '-startObservingPerson:'
 'MyDocument' may not respond to '-startObservingPerson:'

Happy for contradiction

Cheers Martin

Martin Kyte
Electronics Workshop
MRC Laboratory of Molecular Biology
Hills Road, Cambridge, CB2 2QH
Tel 01223 252975
email@hidden


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