json - 在 Swift 3.0 中如何从返回的 json 中获取特定值？

Question

我想在 Swift 中从 json 中获取一个值。我添加了数据树的图像。我以前的尝试没有奏效。下面是打印完整的 json 对象的代码，这是我不想要的。

json TreeMap 像

import PlaygroundSupport
import UIKit

let url = URL(string: "https://api.data.gov.sg/v1/transport/taxi-availability")
var request = URLRequest(url: url!);
request.addValue("xxxx", forHTTPHeaderField: "api-key")
let task = URLSession.shared.dataTask(with: request) { data, response, error in
    guard error == nil else {
        print(error)
        return
    }
    guard let data = data else {
        print("Data is empty")
        return
    }

    let json = try! JSONSerialization.jsonObject(with: data, options: [])
    //print(json)

    }//end



//["features"]??[0]?


task.resume()
PlaygroundPage.current.needsIndefiniteExecution = true

Answer 1

你只需要对你出售的 json 做一些事情:

let task = URLSession ... { data, response, error in
    let json = JSONSerialization.jsonObject(...)

    if let json = json as? [String: Any] {
       // now you have a top-level json dictionary
       for key, value in json {
           print("json[\"\(key\")] = \(value)")
       }
    }
}