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应用程序应迅速启动，这样用户可以立即开始使用它们，而不会有延迟。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.”

用发射图像显示相似的应用程序的初始画面。这就减少了应用程序被感知的启动时间。（有关更多信息，参见“发射图像”（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"相关信息"窗口，启动画面，或提供任何其他妨碍用户立即使用程序的体验。

• 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，展开纵向。如果你希望你的应用程序仅适用于横向，就用横向, 不管当前设备以什么方向显示。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.

只有一个方向显示的应用程序，应该同时支持横向和纵向两个方向，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，只能横向使用的程序就应该在这个方向加载。否则，只支持横向使用的程序的该默认主页按钮应该在右边。

• 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。