The "Open" menu item of my app is gray - How can I open files from within my app?

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Created Jul ’22

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I've completed a simple app that plays 3D video. Now, I'm trying to make it open files from the menu, as well as using the Cmd-O keyboard shortcut.

But the "Open" menu item in the "File" menu is gray - I don't know exactly what this means, but it seems that the current form of the app doesn't support openning files.

I've had a func application(_ application: NSApplication, openFile filename: String) -> Bool function in my app delegate, I've had a CFBundleDocumentTypes with an entry of the MIME type of "video/mp4".

What am I doing wrong?

Answered by DannyNiu-NJF in 719516022

The app delegate callback is only used with NSDocument-based file-opening method, which requires configuring appropriate file types supported by the app in app's "Info.plist".

We can instead rely on NSOpenPanel for a customized file openning experience - write an @IBAction callback to be invoked when the open command is issued (from keyboard shortcut or app menu), and instantiate an NSOpenPanel to open the file.

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DannyNiu-NJF OP

Jul ’22

Accepted Answer

The app delegate callback is only used with NSDocument-based file-opening method, which requires configuring appropriate file types supported by the app in app's "Info.plist".

We can instead rely on NSOpenPanel for a customized file openning experience - write an @IBAction callback to be invoked when the open command is issued (from keyboard shortcut or app menu), and instantiate an NSOpenPanel to open the file.

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