NSOpenPanel should have a setting to only allow the user to select writable paths

Number:rdar://46998745 Date Originated:02-Jan-2019 12:22 PM
Status:Open (Duplicate of 3300000) Resolved:
Product:macOS + SDK Product Version:macOS 10.14.2
Classification:Feature (New) Reproducible:Always
I already opened rdar://46998451, but I think the use-case of "only wanting a path you can write to" such a common use-case that it should be handled by `NSOpenPanel`.

My use-case: I use `NSOpenPanel` to let the user select a directory where my app can output some files. I want to inform the user early, while the open panel is still shown, if the user tries to select a read-only directory, as I wouldn't be able to write to that.

Even if rdar://46998451 is fixed, I still think this feature has merits on its own.

Steps to Reproduce:
I have this code to open the panel:

final class AppDelegate: NSObject, NSApplicationDelegate {
	func convert() {
		let panel = NSOpenPanel()
		panel.delegate = self
		panel.canChooseFiles = false
		panel.canChooseDirectories = true
		panel.canCreateDirectories = true
		panel.allowsMultipleSelection = false
		panel.prompt = "Convert"
		panel.message = "Choose where to save the converted images"

		panel.beginSheetModal(for: window) {
			if $0 == .OK {
				self.startConversion(urls, outputDirectory: panel.urls.first!)

Expected Results:
I expected to be able to set a property, let's call it `panel.allowReadOnlyPaths = false`, to make NSOpenPanel show an error if the user tries to select a read-only file or directory.

Actual Results:
Because of rdar://46998451, I can't even implement this manually, so I have to end up with a user unfriendly workaround that only shows an error after the open panel is dismissed, and then I have to show the open panel again.

macOS 10.14.2



Apple Developer Relations

Engineering has determined that your bug report is a duplicate of another issue (3300000) and will be closed.

By sindresorhus at Jan. 11, 2019, 2:32 a.m. (reply...)

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By sindresorhus at Jan. 2, 2019, 11:27 a.m. (reply...)

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