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Asked: 2026-06-02T06:14:58+00:00

I am trying to use the following statement to create a document: id myDocument

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I am trying to use the following statement to create a document:

id myDocument = [[NSDocumentController sharedDocumentController] openUntitledDocumentOfType:@"MyClass" display:YES];

Nothing is created and myDocument is always nil despite the fact that MyClass is a real class in the project and inherits from NSDocument.

What I am doing wrong?

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1 Answer

  1. Editorial Team

    The type in the openUntitledDocumentOfType:display: method is the document type name as specified in the CFBundleDocumentTypes in your app’s Info.plist file, not the name of your document’s class.

    Specifically, you need to enter the value of the CFBundleTypeName key that corresponds to the type of document you want to open. This value is labelled by default in Xcode’s property list editor as the Document Type Name:

    Xcode property list inspector

    It’s also editable in the Document Types editor in the Info tab of your project settings:

    enter image description here

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