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Re: release and reference counting query
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Re: release and reference counting query


  • Subject: Re: release and reference counting query
  • From: Andy Lee <email@hidden>
  • Date: Tue, 18 Nov 2008 14:05:20 -0500

On Nov 18, 2008, at 1:33 PM, Marc Stibane wrote:
Am 07.11.2008 um 13:17 schrieb Roland King:
On Nov 7, 2008, at 7:59 PM, Calum Robertson wrote:
Below is a snippet of code from the "Creating an iPhone Application" document from the iPhone DevCenter.
- (void)applicationDidFinishLaunching:(UIApplication *)application
{
// Set up the view controller
UIViewController *aViewController = [[UIViewController alloc]
initWithNibName:@"MoveMeView" bundle:[NSBundle mainBundle]];
self.viewController = aViewController;
[aViewController release];
...
}
[...]
what's the reason for defining a local variable aViewController to receive the UIViewController pointer, then copying that to the instance variable with a setter method which increases the retain count, then decrease the retain count again - instead of just using the instance variable?

The above is not an init method and should not assume that it is performing the first assignment to an ivar. For all you know, a value may have been assigned to the ivar by the init method, or by some code that executed between the init method and this method. The safer thing to do is use the accessor method to release any such value if necessary.


Even if this were occurring in an init method, if the ivar happened to be an inherited one, it would make sense to use an accessor to set it in case the inherited init method assigned a value to the ivar that needs to be released.

--Andy

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  • Follow-Ups:
    • Re: release and reference counting query
      • From: Marc Stibane <email@hidden>
References: 
 >release and reference counting query (From: Calum Robertson <email@hidden>)
 >Re: release and reference counting query (From: Roland King <email@hidden>)
 >Re: release and reference counting query (From: Marc Stibane <email@hidden>)

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