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Opening a Finder window

Hi there!

I downloaded an earlier version of XCode so I could complete the FileManager tutorial (it has errors with XCode 11/Swift 5.1) but I feel like I missed something because of the code already being written for us. I just…didn’t absorb what we were supposed to be doing as well as I do when going through making everything step by step.

Specifically, I’m just not sure I understand exactly what was used to open the finder window. I know it happens in here:

		// 1
		guard let window = view.window else { return }
		// 2
		let panel = NSOpenPanel()
		panel.canChooseFiles = false
		panel.canChooseDirectories = true
		panel.allowsMultipleSelection = false
		// 3
		panel.beginSheetModal(for: window) { (result) in
			if result.rawValue == NSFileHandlingPanelOKButton {
				// 4
				self.selectedFolder = panel.urls[0]

But I’m just not connecting how to replicate that in my own project.

For instance, this is what I have in a playground (modeled off the playground portion of the tutorial and also a discussion I was reading at Stack Overflow) which works:

import Cocoa

// Get the home directory url
let homePath = FileManager.default.currentDirectoryPath
let homeURL = URL(fileURLWithPath: homePath)

do {
	// Get the directory contents urls (including subfolders urls)
	let directoryContents = try FileManager.default.contentsOfDirectory(at: homeURL, includingPropertiesForKeys: nil)
	// if you want to filter the directory contents you can do like this:
	let mp3Files = directoryContents.filter{ $0.pathExtension == "mp3" }
	print("mp3 urls:",mp3Files)
	let mp3FileNames ={ $0.deletingPathExtension().lastPathComponent }
	print("mp3 list:", mp3FileNames)

	let m4bFiles = directoryContents.filter{ $0.pathExtension == "m4b" }
	print("m4b urls:",m4bFiles)
	let m4bFileNames ={ $0.deletingPathExtension().lastPathComponent }
	print("m4b list:", m4bFileNames)

	let m4aFiles = directoryContents.filter{ $0.pathExtension == "m4a" }
	print("m4a urls:",m4aFiles)
	let m4aFileNames ={ $0.deletingPathExtension().lastPathComponent }
	print("m4a list:", m4aFileNames)

	let aaxFiles = directoryContents.filter{ $0.pathExtension == "aax" }
	print("aax urls:",aaxFiles)
	let aaxFileNames ={ $0.deletingPathExtension().lastPathComponent }
	print("aax list:", aaxFileNames)
} catch {

(I’m sure there must be a much less repetitive way to structure the filters, but I haven’t gotten far enough to research it yet)

But I’m just…not making the connection on how to open a finder window with those filters.

I’m so close, but this is just a little beyond what I understand how to do at this point in my learning process. What am I missing?