在macOS应用程序的打开的窗口中更改文档 [英] Change document in open window in macOS app

问题描述

我正在为macOS编写基于文档的应用程序.我正在尝试编写一项功能来更改当前窗口中的活动文档(以便能够循环浏览文件夹中的下一个/上一个文档，就像使用浏览器应用程序那样.)

I am writing a document-based application for macOS. I am trying to write a feature that changes the active document in the current window (in order to be able to cycle through the next/previous documents in a folder, the way one can do with image-browser apps).

我应该调用什么命令在当前窗口中打开另一个文档?该文档建议openDocument可以执行此操作，但是当我运行

What command should I be calling to open a different document in the current window? The documentation suggests that openDocument might do this, but when I run

documentController.openDocument(nextFile！)

然后我得到一个NSOpenPanel，它可以在一个单独的窗口中打开一个新文档.如何在当前窗口中打开另一个文档-使用在编码中指定的URL，而不是通过OpenPanel?

then I just get an NSOpenPanel which opens a new document in a separate window. How can I open a different document in the current window - with a URL I specify in coding, rather than through an OpenPanel?

推荐答案

您无法在其他文档的窗口中打开文档.代替

You can't open a document in the window of another document. Instead of

NSDocumentController -> 文档-> 窗口

反过来做

应用程序委托-> 窗口/视图-> 文档.

窗口由应用程序委托或控制器拥有，并且窗口的视图控制器拥有文档.该文档是使用

The window is owned by the app delegate or a controller and the view controller of the window owns the document. The document is created with

convenience init(contentsOf url: URL, ofType typeName: String) throws

NSDocument 的 addWindowController(_:)的文档表明可以替换窗口控制器的文档:

The documentation of addWindowController(_:) of NSDocument suggests that it's possible to replace the document of a window controller:

您不能一次将一个窗口控制器附加到一个以上的文档中.此方法的默认实现是将传递的窗口控制器从其所附加的文档中删除(如果已附加到该窗口中)，然后向其发送以self为参数的文档消息.它还会忽略多余的调用.

You cannot attach a window controller to more than one document at a time. The default implementation of this method removes the passed-in window controller from the document to which it is attached, if it is already attached to one, then sends it a document message with self as the argument. It also ignores redundant invocations.

是的，它确实可以在我的测试应用中正常工作

and yes, it does work in my test app:

let prevDocument = windowController.document
let newDocument = Document(contentsOf: newURL, ofType: myDocumentType) // add do-catch
NSDocumentController.shared.addDocument(newDocument);
newDocument.addWindowController(windowController)
prevDocument.close()

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