Overriding NSDocument.prepareSavePanel(_:) hides file format popup button

Question

Created Apr ’25

Replies 4

Boosts 0

Participants 2

I would like to provide a default filename when saving a document depending on the document data. I thought I could do so by overriding NSDocument.prepareSavePanel(_:) and setting NSSavePanel.nameFieldStringValue, but simply implementing that method seems to hide the file format popup button shown by default (see image). Calling super doesn't help.

Is it possible to set a default filename and keep the file format popup button? On macOS 15, I can toggle NSSavePanel.showsContentTypes, but how about macOS 14 and older?

Answered by DTS Engineer in 836921022

Have you enabled the allowsOtherFileTypes option for the NSSavePanel? Reviewing the NSDocument sources I can see those sources are aware of that option and gate some operations based on its setting.

Boost

Answer 1

DTS Engineer OP

Apple

Apr ’25

Recommended

Have you enabled the allowsOtherFileTypes option for the NSSavePanel? Reviewing the NSDocument sources I can see those sources are aware of that option and gate some operations based on its setting.

0

Answer 2

Nickkk OP

Apr ’25

allowsOtherFileTypes alone makes the file format popup button appear, but then setting accessoryView makes it disappear again. Is it possible to have both?

 override func prepareSavePanel(_ savePanel: NSSavePanel) -> Bool {
    savePanel.allowsOtherFileTypes = true
    savePanel.accessoryView = NSTextField(labelWithString: "asdf")
    return true
}

0

Answer 3

DTS Engineer OP

Apple

Apr ’25

Ah, I see. Since your app allows multiple file types you'll also need to override shouldRunSavePanelWithAccessoryView to allow the popup to be displayed.

0

Answer 4

Nickkk OP

Apr ’25

I just tried, but it doesn't change anything. The documentation also states that it already returns true by default.

0

	override func prepareSavePanel(_ savePanel: NSSavePanel) -> Bool {
	savePanel.allowsOtherFileTypes = true
	savePanel.accessoryView = NSTextField(labelWithString: "asdf")
	return true
	}