如何訪問迅速

Question

JSON對象數組內無法訪問JSON對象，它是JSON對象 內部數組我要訪問從JSON對象具有內部陣列 和JSON文件陣列的數據也會上傳 所以請能任何人檢查和幫助我如何得到「weather.description」 數據

override func viewDidLoad() { 
    super.viewDidLoad() 

    let url = URL(string: "http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=13ae70c6aefa867c44962edc13f94404")! 

    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in 

     if error != nil { 
      print("some error occured") 
     } else { 

      if let urlContent = data { 

       do{ 
        let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) 

        let newValue = jsonResult as! NSDictionary 

        print(jsonResult) 

        let name = newValue["name"] 
        //Here i am getting name as variable value 

        //this is not working 
        let description = newValue["weather"]??[0]["description"] 

        //this is not working 
        let description = newValue["weather"]!![0]["description"] 

        print() 

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

      } 
     } 
    } 
    task.resume() 

} 

Answer 1

我編輯了自己的代碼位，並增加了一些註解。 Basiclly，讓我們檢查你的響應結構的類型，並獲得所需的值。

let url = URL(string: "http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=13ae70c6aefa867c44962edc13f94404")! 
     let task = URLSession.shared.dataTask(with: url) { (data, response, error) in 
      if error != nil { 
       print("some error occured") 
      } else { 

       if let urlContent = data { 

        do{ 
         let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) 

         // I would not recommend to use NSDictionary, try using Swift types instead 
         guard let newValue = jsonResult as? [String: Any] else { 
          print("invalid format") 
          return 
         } 

         // Check for the weather parameter as an array of dictionaries and than excess the first array's description 
         if let weather = newValue["weather"] as? [[String: Any]], let description = weather.first?["description"] as? String { 
          print(description) 
         } 

        }catch { 
         print("JSON Preocessing failed") 
        } 
       } 
      } 
     } 
     task.resume()