Example of how to create a file class with read, write and exists functions

file.swift

import Foundation

class File {

    class func exists (path: String) -> Bool {
        return NSFileManager().fileExistsAtPath(path)
    }
    
    class func read (path: String, encoding: NSStringEncoding = NSUTF8StringEncoding) -> String? {
        if File.exists(path) {
            return String.stringWithContentsOfFile(path, encoding: encoding, error: nil)!
        }
        
        return nil
    }
    
    class func write (path: String, content: String, encoding: NSStringEncoding = NSUTF8StringEncoding) -> Bool {
        return content.writeToFile(path, atomically: true, encoding: encoding, error: nil)
    }
}

let read : String? = File.read("/path/to/file.txt")

println(read)

let write : Bool = File.write("/path/to/file2.txt", content: "String to write")

println(write)

Hi Friends,
I add something new fades previous data.
I would hope that when you added new data is added to the old data.
So you'd already added protection.
example:
File.write("/path/to/file2.txt", content: "String to write"
File.write("/path/to/file2.txt", content: "Hello world"
File.read("/path/to/file.txt") ---- > print out ->"Hello world"
"String to write" deleted
File.read("/path/to/file.txt") ---> print out -> "String to write
Hello world" must be
How do I do this?

And how can I create a new file?

String.stringWithContentsOfFile() has been deprecated. You need to use:
String(contentsOfFile: path, encoding: encoding, error: nil)

Thank you so much!