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copied!<p>From <a href="http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/MemoryMgmt/Articles/mmRules.html" rel="nofollow">apple documentation</a></p> <blockquote> <p>You only release or autorelease objects you own. You take ownership of an object if you create it using a method whose name begins with “alloc” or “new” or contains “copy” (for example, alloc, newObject, or mutableCopy), or if you send it a retain message.</p> <p>You use release or autorelease to relinquish ownership of an object. autorelease just means “send a release message in the future” (to understand when this will be, see “Autorelease Pools”).</p> </blockquote> <p>Your second two questions are related. All that @synthesize does is to generate additional methods for your implementation file. The arguments to @property (nonatomic, retain) NSString* myString; define the behavior of the generated methods. For example, if you declare a property as retain, the setMyString generated method will retain its argument.</p> <p>Nonatomic is important because properties, by default, are threadsafe. If you don't need thread safety, you can remove a lot of overhead in your accessor methods.</p> <p>Finally, the implementation of a retain property is</p> <pre><code>- (void) setMyString:(NSString*)newString { [newString retain]; [myString release]; myString = newString; } </code></pre> <p>So, saying self.myString = nil effectively releases myString for you. Many people advocate using self.property = nil for retained properties, as opposed to [property release], though I think it just comes down to personal preference.</p>

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