出自UXGuide.net

提供选择

Providing Choices

iPhone OS includes a few elements that help users make selections. When you need to offer choices in your application, you should use these selection methods because users are already familiar with their behavior. In general, you should not try to replicate the appearance and behavior of selection controls you might see in a desktop computer application, such as an application menu or a set of radio buttons. iPhone OS provides the following elements you can use to offer choices to users:

iPhone 操作系统包含了一些界面元素提供给用户作出选择。当当你需要在应用程序里提供选择时，你应该提供这样选择方式，因为用户已经很熟悉（这些方式）的行为。一般来说，你不应该把桌面应用程序的选择控件的外观和行为直接复制过来，比如应用程序菜单或者一组单选按钮。iPhone OS 提供以下界面元素供你使用至给用户提供选择：

• Lists (that is, table views). Users tap a row in a list to select an item. Lists are suitable for displaying almost any number of choices. For details on the ways you can use table views in your application, see “Table Views.”

列表（即表格视图）。用户点击列表里的一行来选择一个项目。列表几乎适用于展示任何数量的选择。关于在应用程序里如何使用表格视图的具体内容，参见“表格视图”。

• Pickers, including date and time pickers. Users spin the wheels in a picker until each wheel displays the desired part of a multipart value, such as a calendar date that comprises year, month, and day. For more information about using pickers in your iPhone application, see “Date and Time Pickers” and “Pickers.”

选取器，包括日期和时间选取器。用户拨动选取器内的滚轮，直到每个滚轮都显示了期望的那个组合的数值，比如一个日期组合包含年，月，日的数值。关于在iPhone应用程序里如何使用选取器的更多信息，参见“日期时间选取器”和“选取器”。

• Switch controls. Users slide a switch control from one side to the other, revealing one of two values. A switch control is intended to offer a simple choice within a list. For more information about switch controls, see “Switch Controls.”

开关控件。用户将开关控件从一端滑动到另外一端，表示选择两个值中的一个。开关控件是用来在列表中提供简单选择的。关于开关控件的更多内容，参见“开关控件”。