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Re: NSDate And Super Class
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Re: NSDate And Super Class


  • Subject: Re: NSDate And Super Class
  • From: Andy Lee <email@hidden>
  • Date: Tue, 24 Feb 2009 22:01:01 -0500

On Feb 24, 2009, at 8:25 PM, Richard Good wrote:
-(DateTest*)	init	{
	[super init];
	aDate =[NSDate date];
	return self;
}

Wait a minute. I just figured out you're saying the *debugger* says datesubClass.aDate is out of scope, not the compiler as I thought. The reason is that you're not retaining aDate in the init method. It gets deallocated prematurely and the pointer is invalid, hence "out of scope". Try


	aDate = [[NSDate date] retain];

If it's unclear why you need to do this, you need to study memory management -- it's a prominent chapter in the docs, you should be able to find it, plus it's linked to many, many times in the list archives.

There are other coding issues: init methods should return id, and they should check the result of [super init]. There's a chapter on "writing initializers" or some such -- look for that too.

--Andy

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