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最新推荐文章于 2016-10-19 11:21:57 发布

原创最新推荐文章于 2016-10-19 11:21:57 发布 · 264 阅读

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#ios #objective-c #点 #getter和setter

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本文介绍了Objective-C中点语法的应用，这是一种访问对象属性的便捷方式。通过使用点语法，开发者可以更简洁地调用getter和setter方法来读取或设置属性值。需要注意的是，对于标记为只读的属性，尝试使用点语法进行修改会引发编译错误。

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.