这个程序不仅支持用户界面的拖放创建功能，还允许开发人员以图形的方式将 UI 控件 “连接” 到底层应用程序控制器上的方法。

This program not only enables drag-and-drop creation of user interfaces, but also allows developers to visually "wire" the UI controls to methods on the underlying application controllers.

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应用程序的主要层是数据库、持久性框架、数据库访问对象和用户界面(UI)控制器及视图层。

The main layers of the application are a database, a persistence framework, a database access object, and user interface (UI) controller and view layers.

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如果想在iPhone应用程序中显示不同的界面，你要创建新的视图，并用视图控制器把其“推”到前端。

If you want different "screens" on an iPhone app, you create new views, and have a view controller push them into the front.

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