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From: eht@cs.cmu.edu (Eric Thayer)
Newsgroups: comp.sys.next
Subject: Re: Button class bug ?
Message-ID: <1991Feb27.134123.1082@cs.cmu.edu>
Date: 27 Feb 91 13:41:23 GMT
References: <1991Feb26.223500.20157@cs.mcgill.ca>
Sender: netnews@cs.cmu.edu (USENET News Group Software)
Organization: School of Computer Science, Carnegie Mellon
Lines: 54

In article <1991Feb26.223500.20157@cs.mcgill.ca> philwzo@cs.mcgill.ca (Philippe  
WIECZOREK) writes:
> 
> 		I wanted to change the name of a button. I used the
> 	following code:
> 
> - changeTitle:sender
> {
> 	if ( condition )
> 		[sender setTitle:"title1"];
> 	else
> 		[sender setTitle:"title2"];
> 
> 	return self;
> }
> 
> 		I was forced to put a '[sender display]' just before the
> 	'return self' in order to make the button redisplay properly. If
> 	not, the two titles are one on the other. In that particular
> 	case, the '1' of 'title1' will mix with the '2' of 'title2'.

I am not sure exactly what you are doing because the following code works for  
me (if you have internet access see pub/foo using anonymous ftp to  
moo.speech.cs.cmu.edu)


/* Generated by Interface Builder */

#import "Controller.h"
#import <appkit/Control.h>

@implementation Controller

- changeTitle:sender
{
    static int i = 0;

    if (!i) {
	[sender setTitle:"foo"];
	i = 1;
    }
    else {
	[sender setTitle:"bar"];
	i = 0;
    }
    return self;
}
@end

It alternates the title on the button between foo and bar without incident.   
Maybe you are using a different button flavor rather than the standard plain  
old button?

..eric