swift save data to file code example

Example 1: swift save data to file

let file = "file.txt" //this is the file. we will write to and read from it

let text = "some text" //just a text

if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {

    let fileURL = dir.appendingPathComponent(file)

    //writing
    do {
        try text.write(to: fileURL, atomically: false, encoding: .utf8)
    }
    catch {/* error handling here */}

    //reading
    do {
        let text2 = try String(contentsOf: fileURL, encoding: .utf8)
    }
    catch {/* error handling here */}
}

Example 2: save file with % swift

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return paths[0]
}

Example 3: save file with % swift

let str = "Super long string here"
let filename = getDocumentsDirectory().appendingPathComponent("output.txt")

do {
    try str.write(to: filename, atomically: true, encoding: String.Encoding.utf8)
} catch {
    // failed to write file – bad permissions, bad filename, missing permissions, or more likely it can't be converted to the encoding
}