FileManagerTest.swift

import Foundation

let fileManager = FileManager()

let documentsDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!

let dataPath = documentsDirectory.appendingPathComponent("FileManager Directory")

do {
    try fileManager.createDirectory(atPath: dataPath.path, withIntermediateDirectories: false, attributes: nil)
    
} catch let error as NSError {
    print("Error creating directory: \(error.localizedDescription)")
}

do {
    let helloPath = dataPath.appendingPathComponent("Hello.txt")
    let text = "Hello File From Swift"
    
    do {
        try text.write(to: helloPath, atomically: false, encoding: .utf8)
    }
    
} catch let error as NSError {
    print("Error creating File : \(error.localizedDescription)")
}

do {
    let helloPath = dataPath.appendingPathComponent("Hello.txt")
    
    let text2 = try String(contentsOf: helloPath, encoding: .utf8)
    
    print(text2)
}
catch let error as NSError {
    print("Error creating File : \(error.localizedDescription)")
}