使用SwiftyJSON从JSON读取数据时获得Null

I am reading JSON from two places 1) from a file and 2) from url. this is my JSON file

我正在从两个地方读取JSON 1）来自文件和2）来自url。这是我的JSON文件

{
"People": {

    "Person1" : {

        "Name" : "Umair",
        "Age" : "22"
    },

    "Person2" : {

        "Name" : "Rehman",
        "Age" : "28"
    },

    "Person3" : {

        "Name" : "Saqib",
        "Age" : "32"
    },

    "Person4" : {

        "Name" : "Fahad",
        "Age" : "18 "
    },

  }
}

and this is how I read it using SwiftyJson

这就是我使用SwiftyJson读取它的方式

let path: String = NSBundle.mainBundle().pathForResource("jsonFile", ofType: "json") as String!
let jsonData = NSData(contentsOfFile: path) as NSData!
let readableJSON = JSON(data: jsonData, options: .MutableContainers, error: nil)
var myName = readableJSON["People","Person1","Name"]
print(myName)

in result it gives me the name no problem here. when I try to get the Json from url using same method I get the complete Json file in return but when I try to get a specific field it return null. here is my code for that

结果它给我这个名字没有问题。当我尝试使用相同的方法从url获取Json时，我获得了完整的Json文件，但是当我尝试获取特定字段时，它返回null。这是我的代码

    let url = NSURL(string: "http://api.randomuser.me/")
    let session = NSURLSession.sharedSession()
    session.dataTaskWithURL(url!, completionHandler: { ( data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in

        // Make sure we get an OK response
        guard let realResponse = response as? NSHTTPURLResponse where
            realResponse.statusCode == 200 else {
                print("Not a 200 response")
                return
        }

        // Read the JSON                
            let readableJSONFromWeb = JSON(data: data!, options: .MutableContainers, error: nil)
            var origin = readableJSONFromWeb["results"]
            print(origin)


    }).resume()
}

as per above code I get this output

按照上面的代码我得到这个输出

Umair
[
 {
  "id" : {
   "name" : "SSN",
   "value" : "026-36-3780"
 },
"nat" : "US",
"cell" : "(862)-296-4803",
"phone" : "(528)-560-7652",
"login" : {
  "username" : "ticklishmouse295",
  "password" : "julie",
  "sha256" : "01234103cae3a10c5813a7c5dfd069e2533860cf2786df4dc31a501eb66b9c37",
  "sha1" : "46fa91a26c5219823b0c4a2c0fd99d390c997cd9",
  "salt" : "aU4VTMOV",
  "md5" : "be3f89edd4f22f333433d2424cbf4a95"
},
"registered" : 1144149087,
"dob" : 1170844810,
"picture" : {
  "large" : "https:\/\/randomuser.me\/api\/portraits\/women\/40.jpg",
  "thumbnail" : "https:\/\/randomuser.me\/api\/portraits\/thumb\/women\/40.jpg",
  "medium" : "https:\/\/randomuser.me\/api\/portraits\/med\/women\/40.jpg"
},
"location" : {
  "state" : "north carolina",
  "street" : "9402 mcclellan rd",
  "city" : "arvada",
  "postcode" : 93836
},
"email" : "ethel.palmer@example.com",
"gender" : "female",
"name" : {
  "title" : "mrs",
  "first" : "ethel",
  "last" : "palmer"
}
}
]

but when I try to get a specific field using

但是当我尝试使用特定的字段时

var origin = readableJSONFromWeb["results","location"]

I get null in return

我得到null作为回报

1 个解决方案

#1

Subscripting like this with SwiftyJSON:

使用SwiftyJSON进行这样的订阅：

var origin = readableJSONFromWeb["results","location"]

only works if the entire path is made of dictionaries.

仅当整个路径由字典组成时才有效。

But your results key holds an array, so you have to pass the index of the array item you want to get.

但是您的结果键包含一个数组，因此您必须传递要获取的数组项的索引。

Example for getting the first item from the array:

从数组中获取第一个项目的示例：

var origin = readableJSONFromWeb["results",0,"location"]

Result:

结果：

{
  "city" : "sittard-geleen",
  "postcode" : 85004,
  "street" : "4774 pieterskerkhof",
  "state" : "flevoland"
}

#1