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Editorial Team
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Asked: 2026-05-25T10:18:08+00:00

So I have a PanelController which is a NSWindowController, and it instantiates an object

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So I have a PanelController which is a NSWindowController, and it instantiates an object called FileUploader. But inside of FileUploader, I want to be able to update some text on the Panel informing the user of the progress that has been made so far. But I don’t know how to reference PanelController given that I can’t instantiate a new one.

Am I supposed to use ApplicationDelegate as the go-between, and if so how do I reference that? If so, do I need ApplicationDelegate to instantiate both PanelController and FileUploader, but then I still don’t understand how to reference the ApplicationDelegate.

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1 Answer

  1. Editorial Team

    Also consider using blocks which is another more modern apple approach to callbacks. Apple is using it more and more in their new APIs.

    Here’s a specific SO on updating UI and also making it async:

    GCD, Threads, Program Flow and UI Updating

    Here’s another SO article on blocks & delegates as callbacks

    How to simplify callback logic with a Block?

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