json-parsing.swift

//: Playground - noun: a place where people can play

import UIKit
import Foundation

extension NSString {
  
  private static let unicodeTransform: NSString = "Any-Hex/Java"
  
  func decodeUnicode() -> NSString? {
    
    if let decoded = self.mutableCopy() as? NSMutableString {
      CFStringTransform(decoded, nil, String.unicodeTransform, true)
      return decoded
    }
    
    //TODO warning
    return nil
  }
  
  func encodeUnicode() -> NSString {
    //TODO
    return self
  }
}

if let file = NSBundle.mainBundle().pathForResource("test3", ofType: "json") {
  do {
    let content = try NSString(contentsOfFile: file, encoding: NSUTF8StringEncoding)
    
    if let data = content.dataUsingEncoding(NSUnicodeStringEncoding) {
      let json = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)
      if let tips = json["tips"],
        home_screen = tips!["home_screen"],
        html_content = home_screen!["html_content"] as? NSString {
          let s = html_content.decodeUnicode()
      }
    }
  } catch {
    print(error)
  }
}