JSON To Array in Swift

Question

I'm Using Swift2.0+, SwiftyJSON, Alamofire

I Got the Value let stringJSON:JSON = ["a1","a2","a3"] from Server

But If I Check stringJSON[0],Then it's null

When I debugPrint(stringJSON), Then it's ["a1","a2","a3"]

How Can I got the value stringJSON[0] //"a1" ?

Do I Have To Convert From JSON To Another?

Are you sure stringJSON it's a array and not a simple String? Maybe something like this "["a1","a2","a3"]" and not this ["a1","a2","a3"]? — Luca Angeletti
– Luca Angeletti, Commented Feb 26, 2016 at 13:53
I checked. debugPrint(stringJSON is JSON) is true and debugPrint(stringJSON) is ["a1","a2","a3"] — Yoohogyun
– Yoohogyun, Commented Feb 26, 2016 at 13:56

Luca Angeletti · Accepted Answer · 2016-02-26 14:53:56Z

2

The correct syntax is

let stringJSON:JSON = ["a1","a2","a3"]

if let firstValue = stringJSON.array?.first {
    print(firstValue) // a1
}

Update

Since the value actually contains this string "[\"a1\/a1\",\"a2\/a2\",\"a3\"]" and you cannot fix this on the server side here it is a workaround.

if let words = stringJSON.string?.characters.dropFirst().dropLast().split(",").map(String.init) {
    let word = String(words[0].characters.dropFirst().dropLast())
    print(word) // a1
}

edited Feb 26, 2016 at 14:53

answered Feb 26, 2016 at 14:00

Luca Angeletti

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8 Comments

Yoohogyun Over a year ago

The Code Works Perfect. But In My Code Value stringJSON.array returns nil.

Luca Angeletti Over a year ago

@Yoohogyun: So it's not an array. You have something else inside your JSON. If you try my code (where stringJSON actually contains an array) in Playground it will work.

Yoohogyun Over a year ago

Yes I Tried That. That Working On. But When I Got the Data From Server(Using Alamofire) Then, stringJSON.array Not Working On. Any Thing else?

Luca Angeletti Over a year ago

You must check the server. It's not sending you an array. Please let me see your full JSON in plain text.

Yoohogyun Over a year ago

Edited Answer works Perfect! Thanks for Your concern

|

elmarko · Accepted Answer · 2016-02-26 14:01:54Z

1

if let x = stringJSON[0].string{
print(x)
}

edited Feb 26, 2016 at 14:01

answered Feb 26, 2016 at 13:56

elmarko

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4 Comments

Yoohogyun Over a year ago

compile Error. Error Message here. Value of type 'JSON' has no member 'String'

Eric Aya Over a year ago

@Yoohogyun It's .string and everything you need to know is already in the examples on GitHub: github.com/SwiftyJSON/SwiftyJSON#subscript

elmarko Over a year ago

@EricD gah! I was so close

Yoohogyun Over a year ago

i've read them. but I Mean The JSON To JSON Array. The Document Has Only NSArray To JSON.

fdiaz · Accepted Answer · 2016-02-26 14:54:56Z

1

Since the server is not returning an Array, but a String, you need to convert that into an Array of Strings like this:

let string = stringJSON.string
let array = string.stringByReplacingOccurrencesOfString("[", withString: "")
    .stringByReplacingOccurrencesOfString("]", withString: "")
    .stringByReplacingOccurrencesOfString("\"", withString: "")
    .componentsSeparatedByString(",")

answered Feb 26, 2016 at 14:54

fdiaz

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Comments

Mr.任帅 · Accepted Answer · 2016-02-27 16:39:15Z

0

stringJSONIf it is a string type, you can like this to solve:

extension String {

var parseJSONString: AnyObject? {
    var any: AnyObject?
    let data = self.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
    do{
        any = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers)
    }catch let error as NSError{
        print("error: \(error)")
    }
    return any
}

and use it like this:

let strArr = stringJSON.stringvalue.parseJSONString as! Array<String>

edited Feb 27, 2016 at 16:39

answered Feb 27, 2016 at 16:18

Mr.任帅

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1 Comment

Mr.任帅 Over a year ago

First, you want to make sure it is a type string array,like this: "[\"a1\/a1\",\"a2\/a2\",\"a3\"]" The need to parse

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