在 Swift 语言中更好的处理 JSON 数据：SwiftyJSON

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let json = JSONValue(dataFromNetworking)

if let userName = json[0]["user"]["name"].string{

  //Now you got your value

}

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let json = JSONValue(dataFromNetworking)

if let userName = json[999999]["wrong_key"]["wrong_name"].string{

  //Calm down, take it easy, the ".string" property still produces the correct Optional String type with safety

}

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let json = JSONValue(jsonObject)

switch json["user_id"]{

case .JString(let stringValue):

    let id = stringValue.toInt()

case .JNumber(let numberValue):

    let id = numberValue.integerValue

default:

    println("ooops!!! JSON Data is Unexpected or Broken")

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let json = JSONValue(dataFromNetworking)["some_key"]["some_wrong_key"]["wrong_name"]

if json{

  //JSONValue it self confirm to Protocol "LogicValue", with JSONValue.JInvalid produce false and others produce true

}else{

  println(json)

  //> JSON Keypath Error: Incorrect Keypath "some_wrong_key/wrong_name"

  //It always tells you where your key starts went wrong

  switch json{

  case .JInvalid(let error):

    //An NSError containing detailed error information

  }

}