Provides classes that expose basic user interface classes that handle screen layout and interaction with the user.

提供处理屏幕布局和用户交互的基础类。

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For example, we might add user interface logic that we want to keep separate from our model, or we might add some classes for performance reasons.

例如，我们可能会添加想与模型分离开来的用户接口逻辑，或者我们可能会出于性能方面的原因而添加某些类。

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The user interface that you'll create for this application won't look like anything special, but it will show how to work with the classes that we've created.

为该应用程序创建的用户界面看上去也没有什么特别，但它将展示如何使用已创建的类。

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