instruments showing NSPlaceholderstring leaks

I'm trying to reduce the memory leaks in my app, so i used instruments to find all the leaks. I managed to remove almost all of the leaks, except a very annoying one.

Instruments is telling me that i have a lot of NSPlaceholderstring leaks. The code that generated the leak (according to instruments) is:

if (nil == storedHash) 
{
  NSString *description = [[NSString alloc] initWithFormat:@"1 = %@ 2= %d", uId, service];
  self.storedHash = description; // This line is the leak according to instruments

  [description release];
  description = nil;
}

return storedHash

storedHash is define like this:

@property(copy) NSString* storedHash;

I tried everything i can think of:

• I used retain instead of copy
• I used an autorelease allocation of the NSString (stringWithFormat)
• I tried wrapping the code with an autorelease pool

Nothing of the above changed the leak. (In some cases the type of the leaks change, but开发者_JAVA技巧 there are still leaks)

Ideas anyone?

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Where do you release storedHash? Do you release it in dealloc?

Note that NSPlaceholdeString is an implementation detail; it is the class of the instance returned by NSString's +alloc method.

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How about in the dealloc method? Did you release the storedHash in the dealloc method? And how about checking if (nil == self.storedHash)

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You should use

@property(nonatomic, retain) NSString* storedHash;

instead copy. @property(copy) didn't release your old NSObject and you should do it yourself:

if (nil == storedHash) 
{
  NSString *description = [[NSString alloc] initWithFormat:@"1 = %@ 2= %d", uId, service];
  [self.storedHash release];
  self.storedHash = description; // This line is the leak according to instruments

  [description release];
  // description = nil; // it's unnecessary
}

also you should release storedHash in dealloc.