Ios 以字符串形式返回JSON数据，但出现错误

上面的代码查询API的端点以获取特定国家的比特币值。该端点以JSON的形式返回值。我希望函数以字符串形式返回JSON数据，但得到的错误是“无法将“[string]”类型的值转换为预期的参数类型“string”

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您的代码访问权限

货币

，但在该scrope中不存在

var currentcurr = ""
func getCoinPrice (currency:String) {
  currentcurr = currency
  //////
} 

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然后在vc中的任意位置使用

currentcurr

问题解决了我刚刚添加了一个带有空字符串的var，并将我的货币数据分配给我声明的新变量。现在我将JSON数据作为字符串

struct CoinManager {
var delegate: CoinManagerDelegate?
var currency1 = ""
let baseURL = "https://apiv2.bitcoinaverage.com/indices/global/ticker/BTC"
let currencyArray: [String] = ["AUD", "BRL","CAD","CNY","EUR","GBP","HKD","IDR","ILS","INR","JPY","MXN","NOK","NZD","PLN","RON","RUB","SEK","SGD","USD","ZAR"]



mutating func getCoinPrice(currency: String) {


      currency1 = currency



    let urlString = baseURL + currency
    performRequest(urlString: urlString)
    print(urlString)

}

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这里的货币是什么？什么是CoinManagerDelegate？你也可以发布他们的信息吗？并且，不要将代码作为图像发布。请将代码作为文本发布，而不是文本image@Sh_Khan我是stackoverflow的新用户，所以我将花很少的时间来了解您发布了一行定义字符串数组的代码。您想要什么作为输出？JSON字符串？你需要更多specific@DuncanC是的，我想要一个JSON字符串。我是stackoverflow的新手，所以在发布代码时遇到困难，在哪里声明代码？它是否在视图控制器中？您已经只有

getCoinPrice

add

var currentcurr=“”

struct CoinManager {
var delegate: CoinManagerDelegate?
var currency1 = ""
let baseURL = "https://apiv2.bitcoinaverage.com/indices/global/ticker/BTC"
let currencyArray: [String] = ["AUD", "BRL","CAD","CNY","EUR","GBP","HKD","IDR","ILS","INR","JPY","MXN","NOK","NZD","PLN","RON","RUB","SEK","SGD","USD","ZAR"]



mutating func getCoinPrice(currency: String) {


      currency1 = currency



    let urlString = baseURL + currency
    performRequest(urlString: urlString)
    print(urlString)

}