function writeFile()

Question

Created Nov ’21

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I'v been trying to write a document directory file but I can't find the file anywhere. ( Terminal comand: find . -name "blw*"). Part of the ContentView.swift looks like this.

func writeFile() { let file = "blw.txt" let text = "hakemisto" let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! print("documentDir: (documentDirectory)") if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first { let fileURL = dir.appendingPathComponent(file) do { try text.write(to: fileURL, atomically: false, encoding: .utf8) } catch { } } I don't understand what's wrong. That print does not print anything so I guess that whole if section is ignored.

MacOS 12.0.1 XCode 13.1

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Answer 1

Claude31 OP

Nov ’21

You should format code with formatter (<>) to make it readable:

And put statements to see what's going on:

func writeFile() {
    let file = "blw.txt"
    let text = "hakemisto"
    let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    print("documentDir: (documentDirectory)", FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first)    // <<-- To check if not nil
    if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
        let fileURL = dir.appendingPathComponent(file)
        do {
            try text.write(to: fileURL, atomically: false, encoding: .utf8)
        } catch {
             print("Failed to write text: \(error.localizedDescription)")
        }
    }
}

You may have a sandbox issue. You need to use NSSavePanel() to access the file.

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