無法投型「__NSCFDictionary」價值「的NSArray

Question

我做一個GET請求，Blockchain API，這裏是我所得到的：

{ 
    "USD": { 
     "15m": 1973.51, 
     "last": 1973.51, 
     "buy": 1973.51, 
     "sell": 1970.5, 
     "symbol": "$" 
    }, 
    "ISK": { 
     "15m": 204455.64, 
     "last": 204455.64, 
     "buy": 204455.64, 
     "sell": 204143.8, 
     "symbol": "kr" 
    }, 
    "HKD": { 
     "15m": 15400.36, 
     "last": 15400.36, 
     "buy": 15400.36, 
     "sell": 15376.88, 
     "symbol": "$" 
    }, 
    "TWD": { 
     "15m": 59959.18, 
     "last": 59959.18, 
     "buy": 59959.18, 
     "sell": 59867.73, 
     "symbol": "NT$" 
    } 
} 

我嘗試分析USD子對象，而這是我的代碼：

let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in 
      if (error != nil) { 
       print(error); 

      } else { 

       let responseData = String(data: data!, encoding: String.Encoding.utf8); 
       print(responseData); 
       var USD = [String]() 
       do{ 
        if let ipString = NSString(data:data!, encoding: String.Encoding.utf8.rawValue) { 
         let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [NSDictionary]; 
         USD = json.map { ($0 as! [String: AnyObject])["USD"] as! String } 


        } 
       } 
       catch{ 
        print("Parse JSON failed") 
       } 
      } 
     }) 

但是當我運行它，有一個錯誤：

Could not cast value of type '__NSDictionaryM' to 'NSArray'

我知道USD更像是[String:AnyObject]，但它也沒有工作。任何解決方案

Answer 1

這裏沒有你的json響應是數組類型，都是字典類型。希望它能解決你的問題：

var USD = [String: AnyObject]() 
    do{ 
     if let ipString = NSString(data:data!, encoding: String.Encoding.utf8.rawValue) { 
      let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String: AnyObject]; 
      if let usd = json.["USD"] as? [String: AnyObject] { 
       USD = usd 
      } 


     } 
    } 
    catch{ 
     print("Parse JSON failed") 
    }