Back 按钮是否应该退出应用程序?
仅适用于 Android、Windows Phone 或 Windows 平板电脑。
默认情况下,该属性设置为 false,这意味着您负责响应 Back 按钮。要执行此操作,可调用 Input.GetKey 并传递 KeyCode.Escape。
如果将该属性设置为 true,则单击 Back 按钮:
* 在 Android 上,将终止应用程序。
* 在 Windows Phone 或平板电脑上,将暂停应用程序。
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