Mac应用程序故事板 - 访问文档在NSViewController [英] Mac App Storyboard - Access Document in NSViewController

问题描述

我目前在一个基于文档的基于故事板的Cocoa应用程序（Objective C）中与NSDocument打斗。
任何人都可以告诉我我如何访问NSViewController子类中的文档？

I am currently fighting with NSDocument in a document based Storyboard based Cocoa Application (Objective C). Can anybody tell me how i can access the document in the NSViewController subclass?

我试图通过以下方式访问它 - 但是文档是null ：

I've tried to access it the following way - but the document is null:

[self.view.window.windowController document];

感谢您的帮助！

关于
Martin

Best regards Martin

推荐答案

我只是自己摔跤。我开始使用标准的Yosemite模板，并试图在 -viewDidLoad [self.view.window.windowController document] >。在这一点上， self.view.window 是 nil ，所以没有办法到达 document 。

I was just wrestling with this myself. I started with the standard Yosemite template and was trying to use [self.view.window.windowController document] in -viewDidLoad. At that point, self.view.window is nil, so there's no way to get to the document.

诀窍是等待 -viewWillAppear 。到调用时， self.view.window 已填充，文档可用。

The trick is to wait until -viewWillAppear. By the time it is called, self.view.window is populated and the document is available.

序列： -makeWindowControllers 使用storyboard的调用 -self addWindowController： instantiateControllerWithIdentifier：结果。 -addWindowController：在返回之前触发对VC的 -viewDidLoad 的调用。然后，最后，调用 -viewWillAppear （并且文档可用）。

Sequence: -makeWindowControllers invokes -self addWindowController: with the storyboard's -instantiateControllerWithIdentifier: result. -addWindowController: triggers a call to the VC's -viewDidLoad before returning. Then, finally, -viewWillAppear is called (and the document is available).

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