故事板、UIViewController 和 UISplitViewController [英] Storyboard, UIViewController and UISplitViewController

问题描述

尝试为 iPad 制作基于故事板的应用程序.在其中，我需要从开始屏幕 (UIViewController) 过渡到主屏幕 (UISplitViewController)，然后再到全屏视图(再次是 UIViewController).

Trying to make storyboard based application for iPad. In it I need to transition from start screen (UIViewController) to main screen (UISplitViewController) and then to full-screen view (again UIViewController).

我在网络上看到了许多讨论(至少有几个 - 在 stackoverflow 上)，指出 UISplitViewController 除了作为 RootViewController 之外，不能以任何其他方式用于基于 Storyboard 的应用程序.一些线程包含变通方法，还有替代 splitview (https://github.com/mattgemmell/MGSplitViewController)解决这个问题.

I saw a number of discussions on the web (at least several - on stackoverflow), stating that UISplitViewController can't be used in Storyboard based application any other way than being RootViewController. Some threads contain workarounds and there's also alternative splitview (https://github.com/mattgemmell/MGSplitViewController) to cope with this.

但我无法理解的是，为什么 Apple 文档中的说法恰恰相反.这是 链接 到 Apple 的 iOS 5.0 库中的章节.它指出:

But what I can't understand is why Apple documentation states quite the opposite. Here is the link to the chapter from Apple's iOS 5.0 Library. It states:

要将拆分视图控制器添加到应用程序的故事板:

To add a split view controller to your application’s storyboard:

1. 打开应用的主故事板.
2. 从库中拖出一个拆分视图控制器.这也会创建视图控制器用于拆分视图控制器的两个窗格.
3. 对于每个拆分视图控制器包含的视图控制器，使用身份检查器设置视图控制器的类名.

要呈现拆分视图界面，​​请执行以下操作之一:

To present the split view interface, do one of the following:

• 将其显示为第一个场景，通过选择场景并检查属性检查器下的是初始视图控制器"框.
• 从另一个场景中显示它，向它添加一个模态转场.
• 通过调用 performSegueWithIdentifier:sender: 方法来启动模态转场，以编程方式显示它.

我尝试了很多方法，但最后两个语句中描述的方法从未奏效.modal segue 和 performSegue... 都失败，出现众所周知的错误:

I was trying it in many ways, but approaches described in last two statements never worked. Both modal segue and performSegue... fail with well-known error:

*** 由于未捕获的异常NSInvalidArgumentException"而终止应用程序，原因:应用程序试图以模态方式呈现拆分视图控制器......"

"*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a Split View Controllers modally..."

谁能解释一下?这是 XCODE/iOS 5.0 中的错误还是文档中的错误?

Anyone able to explain that? Is this a bug in XCODE/iOS 5.0 or bug in documentation?

问候，彼得

推荐答案

根据此 Apple 文章，拆分视图控制器必须是根.这是一个片段:

According to this Apple article, the split view controller must be the root. Here is a snippet:

拆分视图控制器必须始终是您创建的任何界面的根.换句话说，您必须始终将 UISplitViewController 对象中的视图安装为应用程序窗口的根视图.拆分视图界面的窗格可能包含导航控制器、选项卡栏控制器或实现界面所需的任何其他类型的视图控制器.拆分视图控制器不能以模态呈现.

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. The panes of your split-view interface may then contain navigation controllers, tab bar controllers, or any other type of view controller you need to implement your interface. Split view controllers cannot be presented modally.

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