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copied!<p>I think you <strong>MUST</strong> read the App doc about <a href="https://developer.apple.com/library/ios/documentation/cocoa/conceptual/ProgrammingWithObjectiveC/EncapsulatingData/EncapsulatingData.html" rel="nofollow noreferrer">Encapsulating Data</a>.</p> <p>In particular, with the first code snippet you are saying to wrap an instance variable called <code>_list</code> through accessor methods.</p> <p>In general in OOP they are also called setters and getters. A good discussion of pros of them can be found in <a href="https://stackoverflow.com/questions/1568091/why-use-getters-and-setters">Why use getters and setters?</a>.</p> <p>So, comments of other people are right. Where does the <code>list</code> variable come from?</p> <p>An important thing you need to understand is that the dot syntax is a a concise way to access method calls. So, for example:</p> <pre><code>NSString *nickname = person.nickname; person.nickname = @"This is my nickname"; </code></pre> <p>is equal to</p> <pre><code>NSString *nickname = [person nickname]; [person setNickname:@"This is my nickname"]; </code></pre> <p>A note. Starting form XCode 4.4, the new Apple LLVM compiler 4.0 allows you to skip the <code>@synthesize</code> directive. Under the hood the compiler generates an instance variable with a <code>_</code> suffix. Further references at <a href="http://useyourloaf.com/blog/2012/08/01/property-synthesis-with-xcode-4-dot-4.html" rel="nofollow noreferrer">Automatic Property Synthesis With Xcode 4.4</a>.</p>

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