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Re: Unwanted retain
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Re: Unwanted retain


  • Subject: Re: Unwanted retain
  • From: Kyle Moffett <email@hidden>
  • Date: Wed, 4 Feb 2004 18:52:24 -0500

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On Feb 04, 2004, at 17:41, Lorenzo wrote:
Hi,
I noted that when I call scheduledTimerWithTimeInterval, my self object
retainCounter increments by one.
-------
NSLog(@"A self retain count %d", [self retainCount]);
renderTimer = [[NSTimer scheduledTimerWithTimeInterval:timeInterval
target:self selector:@selector(fireTheTimer) userInfo:nil
repeats:YES] retain];
NSLog(@"B self retain count %d", [self retainCount]);
-------

I get:
-------
A self retain count 1
B self retain count 2
-------

Exactly, the timer retains your object because it keeps a pointer to it in order
to send it a message later when the timer fires.

Then if I deallocate one time only the object "self" from the class I
created it, I don't see the object self deallocated. I have to deallocate it
twice, but then my app crashes.

So in the object that created your object you [someObject release], and it
isn't deallocated. That is by design, because the timer still has a reference
to your object. Perhaps you should add an extra method - (void)removeTimer;
that deletes the timer and breaks the circular reference loop, then you can
[someObject release

Why? Do you know how to fix this?

Everything you described is by design, and doesn't need fixing. Please read
the Memory Management Cocoa docs here:

http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/ index.html

Cheers,
Kyle Moffett

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References: 
 >Unwanted retain (From: Lorenzo <email@hidden>)

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