Read file YML

//
//  ViewController.swift
//  ReadYml2
//
//  Created by Nguyen Van Thieu B on 12/22/16.
//  Copyright © 2016 Thieu Mao. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let url = Bundle.main.resourceURL!
        do {
            let urls = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys:[], options: FileManager.DirectoryEnumerationOptions.skipsHiddenFiles)
            var i = 0
            for url in urls {
                if url.pathExtension == "yml" {
                    do {
                        i = i +  1
                        print(">>>>>> ",i," ", url.lastPathComponent)
                        let text = try String(contentsOf: url, encoding: String.Encoding.utf8)
                        let myStrings = text.components(separatedBy: .newlines)
                        var j = -3
                        for myString in myStrings {
                            j = j + 1
                            if (myString.characters.count == 0) {
                                continue
                            }
                            switch j {
                            case -2, -1, 0:
                                print(j, ":: ", self.removeEndString(myString))
                                break
                            default:
                                let myCutString = self.cutString(myString)
                                print(j, ":: ", myCutString.first, " - ", myCutString.second)
                                break
                            }
                        }
//                        print(text)
                    }
                    catch {
                        print("catch i=", i, " ", url.lastPathComponent)
                    }
                }
            }
        } catch {
            print(error)
        }

    }

    func removeEndString(_ myString: String) -> String {
        let trimmedString = myString.trimmingCharacters(in: .whitespaces)
        return trimmedString.chopSuffix()
    }

    func cutString (_ myString: String) -> (first: String, second: String) {
        let trimmedString = myString.trimmingCharacters(in: .whitespaces)
        let myStrings = trimmedString.components(separatedBy: ":")
        if (myStrings.count == 2) {
            let firstString = myStrings[0].trimmingCharacters(in: .whitespaces)
            var secondString = myStrings[1].trimmingCharacters(in: .whitespaces)
            secondString = secondString.chopSuffix()
            secondString = secondString.chopPrefix()
            return (first: firstString, second: secondString)
        }
        return (first: "", second: "")
    }

}

extension String {

    func chopPrefix(_ count: Int = 1) -> String {
        return self.substring(from: self.characters.index(self.startIndex, offsetBy: count))
    }

    func chopSuffix(_ count: Int = 1) -> String {
        return self.substring(to: self.characters.index(self.endIndex, offsetBy: -count))
    }

}