如何从Swift 3.0中返回的json获取特定值? [英] How do I get a specific value from returned json in Swift 3.0?

问题描述

我正在尝试从Swift中的json获取值.我添加了数据树的图像.我以前的尝试没有用.下面的代码打印了我不想要的完整的json对象.

I am trying to get a value from json in Swift. I have added an image of the data tree. My previous attempts have not worked. Below is code which prints the full json object which is what I don't want.

json树图像

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

推荐答案

您只需要对已经售出的json做些事情:

You just need to do something with the json you've been vended:

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)")
       }
    }
}

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