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如何从它创建的对象中引用控制器?

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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. So I have a PanelController which is a NSWindow




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