拆分视图控制器必须是根视图控制器 [英] Split view controller must be root view controller

问题描述

每当我尝试以模态方式呈现UISplitViewController时，应用程序崩溃。因此，它必须始终是根视图控制器。任何人都可以确认吗？

Whenever I try to present a UISplitViewController modally the application crashes. Thus it must allways be the root view controller. Can anyone confirm that?

推荐答案

来自 Apple iPad编程指南：

应始终将拆分视图控制器的视图
安装为应用程序窗口的根
视图。您
不应该在导航或标签栏
界面内显示拆分视图
。

The split view controller’s view should always be installed as the root view of your application window. You should never present a split view inside of a navigation or tab bar interface.

所以是的，你不能在主应用程序窗口之外呈现拆分视图（包括模态）。

So yes, you cannot present a split view outside of your main application window (that includes modally).

编辑

上述文档的链接不再讨论此主题。现在可以在Apple的查看控制器中找到相关讨论适用于iOS的目录，其中包含以下内容：

The link to the docs above no longer discusses this topic. Relevant discussion can now be found at Apple's View Controller Catalog for iOS, which states the following:

拆分视图控制器必须始终是您创建的任何接口的根。换句话说，您必须始终从UISplitViewController对象安装视图作为应用程序窗口的根视图。 [...]拆分视图控制器无法以模态方式显示。

A split view controller must always be the root of any interface you create. In other words, you must always install the view from a UISplitViewController object as the root view of your application’s window. [...] Split view controllers cannot be presented modally.

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