Re: Learning Cocoa differences

Subject: Re: Learning Cocoa differences
From: Jonah Petri <email@hidden>
Date: Wed, 24 Apr 2002 11:16:05 -0400

Make sure you're doing:

- (id) init
{
	self = [super init];  // rather than just [super init]

	//also, if you want any of the name, airports, etc. strings
	//to stick around, make sure to retain them.

	name = [@"" retain];
	airports = [@"" retain];
	airlines = [@"" retain];
	//etc...

	return self;
}

Then, if you're retaining your instance variables (which you should be, in most cases... Watch out for retain loops though...) you'll have to write a dealloc method too, so that you can release them. Otherwise, you get memory leaks. Bad thing.

- (void) dealloc //This will get called by the system when your object is no longer in use { [name release]; [airports release]; [airlines release]; //etc.. // And lastly, make sure you call dealloc on your superclass [super dealloc]; }

I'm not sure what errors you're getting, but this will probably help a bunch.

For this stuff and more, check out stepwise, or specifically Malcolm Crawford's simple explanation here: http://www.stepwise.com/Articles/Technical/2001-03-11.01.html

Follow those rules, and you really can't go wrong.

-Jonah

On Wednesday, April 24, 2002, at 08:47  AM, Erick van Rijk wrote:

Why are there differences between the O'reilly book and the Examples found on the O'reilly website. I get a lot of warnings when I follow the book.... Most of them are method not found warnings. While I have declared them in the header file....
Any ideas?
Erick
Example:
- (id)init
{
    [super init];
    name = @"";
    airports = @"";
    airlines = @"";
    transportation = @"";
    hotels = @"";
    languages = @"";
    currencyName = @"";
    comments = @"";
    return self;
}
Book:
- (id)init
{
    [super init];
    [self setName:@""];
    [self setAirports:@""];
    [self setAirlines:@""];
    [self setTransportation:@""];
    [self setHotels:@""];
    [self setLanguages:@""];
    [self setCurrencyName:@""];
    [self setComments:@""];
    return self;
}
--
Did you know that:
No piece of paper can be folded more than 7 times.
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References:
	>Learning Cocoa differences (From: Erick van Rijk <email@hidden>)

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