出自UXGuide.net

启动

Starting

iPhone applications should start instantly so users can begin using them without delay. When starting, iPhone applications should:

iPhone应用程序应迅速地启动，这样用户无需延迟即可开始使用它们。启动时，iPhone应用程序应：

• Specify the appropriate status bar style (see “The Status Bar” for information about the available styles).

指定适当的状态栏样式（关于可用样式的更多信息, 参见“状态栏”（第67页））。

• Display a launch image that closely resembles the first screen of the application. This decreases the perceived launch time of your application. For more information, see “Launch Images.”

显示一个与应用程序第一个屏幕极度相似的启动图像。这有助于减少应用程序被感知的启动时间。（有关更多信息，参见“启动图像”（第123页））。

• Avoid displaying an About window, a splash screen, or providing any other type of startup experience that prevents people from using your application immediately.

避免显示"关于"窗口，版权协议屏幕，或任何其他妨碍用户立即使用你的应用程序的启动体验。

• By default, launch in portrait orientation. If you intend your application to be used only in landscape orientation, launch in landscape regardless of the current device orientation. Allow users to rotate the device to landscape orientation if necessary.

默认情况下，在竖向启动。如果你希望你的应用程序仅适用于横向，就使用横向, 无需考虑当前设备的方向。如有必要, 允许用户旋转设备到横向。

A landscape-only application should support both landscape orientations—that is, with the Home button on the right or on the left. If the device is already physically in a landscape orientation, a landscape-only application should launch in that orientation. Otherwise, a landscape-only application should launch in the orientation with the Home button on the right by default.

一个只支持横向屏幕的应用程序，应该同时支持两种横向方式，也就是说，主页按钮可以在右边也可以在左边。如果该设备本身就只是横向的，只支持横向屏幕的应用程序就应该在这个方向启动。否则，只支持横向使用的应用程序默认应该照着主页按钮右边的这个方向启动。

• Restore state from the last time your application ran.

恢复你的应用程序最后一次运行时的状态。