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今天讲Objective-C的点语法，它是accessor方法的简写形式。

Dot Syntax Is a Concise Alternative to Accessor Method Calls

As well as making explicit accessor method calls, Objective-C offers an alternative dot syntax to access an object’s properties.

Dot syntax allows you to access properties like this:

NSString *firstName = somePerson.firstName;
somePerson.firstName = @"Johnny";
           

Dot syntax is purely a convenient wrapper around accessor method calls. When you use dot syntax, the property is still accessed or changed using the getter and setter methods mentioned above:

• Getting a value using somePerson.firstName is the same as using [somePerson firstName]
• Setting a value using somePerson.firstName = @"Johnny" is the same as using [somePerson setFirstName:@"Johnny"]

This means that property access via dot syntax is also controlled by the property attributes. If a property is marked readonly, you’ll get a compiler error if you try to set it using dot syntax.