title: NSString to expected argument NSData
body: <p>I have this code: </p>
  
  <pre><code> let urls : String = Baseurl+"lat="+latitude+"&amp;lon="+longitude+"&amp;APPID="+apiKey
  
          if let url = NSURL(string: urls) {
              do {
                  let jsonResult = try NSString(contentsOfURL: url, usedEncoding: nil)
  
                  do {
                      if let jsonRes = try NSJSONSerialization.JSONObjectWithData(jsonResult, options: []) as? NSDictionary {
                          print(jsonRes)
                      }
                  } catch let error as NSError {
                      print(error.localizedDescription)
                  }
  </code></pre>
  
  <p>But there is an error on this line: <code>if let jsonRes = try...</code>. The error is: <code>cannot convert value of type 'NSString' to expected argument type 'NSData'</code>.</p>
  
  <p>When I print the jsonResult I get this: </p>
  
  <pre><code>{
  
      "coord":{
          "lon":-0.13,
          "lat":51.51
      },
      "weather":[
          {
              "id":501,
              "main":"Rain",
              "description":"moderate rain",
              "icon":"10d"
          }
      ],
      "base":"stations",
      "main":{
          "temp":284.46,
          "pressure":1023,
          "humidity":76,
          "temp_min":283.15,
          "temp_max":285.15
      },
      "visibility":10000,
      "wind":{
          "speed":7.7,
          "deg":220
      },
      "clouds":{
          "all":75
      },
      "dt":1449755400,
      "sys":{
          "type":1,
          "id":5093,
          "message":0.0414,
          "country":"GB",
          "sunrise":1449734113,
          "sunset":1449762690
      },
      "id":2643743,
      "name":"London",
      "cod":200
  
  }
  </code></pre>
  
  <p>How can I acces those values?</p>