iPhone – dealloc – Release vs. nil

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What you have seen is probably these:

1) [foo release];
2) self.bar = nil;
3) baz = nil;

  1. Is releasing the object, accessing it through the instance variable foo. The instance variable will become a dangling pointer. This is the preferred method in dealloc.

  2. Is assigning nil to a property bar on self, that will in practice release whatever the property is currently retaining. Do this if you have a custom setter for the property, that is supposed to cleanup more than just the instance variable backing the property.

  3. Will overwrite the pointer baz referencing the object with nil, but not release the object. The result is a memory leak. Never do this.

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