Swift 3不能使用SwiftyJSON和Alamofire下标索引类型为'String'的'String'类型的值

Question

This is the code, i was making a bitcoin price tracker app and im new to ios development so i am struggling with this error :( any help is appreciated. I am using Alamofire and SwiftyJSON to do the json work. They are imported using cocoapods. This is the json im using: https://apiv2.bitcoinaverage.com/indices/global/ticker/BTCUSD

// Connect the UI
@IBOutlet weak var PriceLabel: UILabel!
@IBOutlet weak var PercentageLabel: UITextView!
@IBOutlet weak var CurrencyPicker: UIPickerView!

var url : String = "https://apiv2.bitcoinaverage.com/indices/global/ticker/BTCUSD"

var Price : String = ""

var jsondata = ""


// Called before app is shown to user
override func viewDidLoad() {
    super.viewDidLoad()

    // Request the JSON Data
    requestJson()
}


func requestJson(){
    Alamofire.request(url).response { response in
        print("Request: \(response.request)")
        print("Response: \(response.response)")

        if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) {
            print("Data: \(utf8Text)")
            self.parseJSON(json: utf8Text)
        }
    }
}

func parseJSON(json: String){
    Price = jsondata["ask"].stringvalue **This is where it kicks an error**
}

Answer 1

func requestJson(){
    Alamofire.request(url).response { response in
        if let data = response.data {
            self.parseJSON(json: JSON(data: data))
        }
    }
}

func parseJSON(json: JSON){
    Price = json["ask"].stringValue 
}

for get json from URL you can also use responseJSON