Swift 2 Json解析数组并获得“ nil”

Question

I am trying to code a simple clipboard translator of myself. So I use an API but I can't get the real data in JSON.

Here is my Code

import Cocoa

var url = NSURL(string: "http://api.fanyi.baidu.com/api/trans/vip/translate?q=%E6%B8%AC%E8%A9%A6%E7%94%A8%E6%96%87%E5%AD%97&from=cht&to=zh&appid=20160223000013220&salt=1435660288&sign=0a697bbcbd4686b168cb3255ffea1427")

var data: NSData
var json: AnyObject!


do{
    data = try NSData(contentsOfURL: url!, options: NSDataReadingOptions.DataReadingUncached)
    json = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments)
}

var transInfo: AnyObject! = json.objectForKey("trans_result['dst']")

In the URL, data of trans_result["dst"] is the answer i want. But from the code below i could only get a "nil" instead of "\测\试\用\文\字"

How can I solve this problem? Was I missing something?

Answer 1

Try this index

trans_result[0].dst

Visualize the json data with codebeautify

Answer 2

You can try this

do{
    data = try NSData(contentsOfURL: url!, options: NSDataReadingOptions.DataReadingUncached)
   let json = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments)

    let arrResult = json["trans_result"]
    print("Result \(arrResult!![0]["src"])")
}catch {
    print("Error in json parsing")
}

Answer 3

You made two mistakes here

1) You can't access the value of dst by doing objectForKey("trans_result['dst']")

2) There is one more layer between trans_result and dst , that means json["trans_result"] is not Dictionary but a Array

In order to get the value you need and make the code safe when unwrapping Optional :

if let array = json.objectForKey("trans_result") as? NSArray where array.count > 0{
    if let dst = array[0].objectForKey("dst") {
        print(dst)
    }
}