Swift JSON to Model Class

Question

I want to put all data from my JSON to model class. How i can do that? All fields and my code i will put right below!

Model

class FacebookUser: NSObject {
    var first_name: String?
    var id: String?
    var last_name: String?
    var name: String?
    var picture: String?

    init(dictionary: [String: AnyObject]) {
        self.first_name = dictionary["first_name"] as? String
        self.id = dictionary["id"] as? String
        self.last_name = dictionary["last_name"] as? String
        self.name = dictionary["name"] as? String
        self.picture = dictionary["picture"] as? String
    }
}

JSON EXAMPLE

{
    "picture" : {
        "data" : {
            "height" : 50,
            "is_silhouette" : false,
            "url" : "link",
            "width" : 50
        }
    },
    "name" : "George Heinz",
    "last_name" : "Heinz",
    "id" : "1860499320637949",
    "first_name" : "George"
}

Make your class implement Codable and then read up on how to implement that protocol properly. Also, no need to subclass NSObject — Joakim Danielson
– Joakim Danielson, Commented Jul 13, 2018 at 6:48
Are all the fields really optional vars? It's make your life easier if fields that must be present use non-optional let… e.g. let id: String — Ashley Mills
– Ashley Mills, Commented Jul 13, 2018 at 7:14
Possible duplicate of Swift 4 - JSON parsing with Codable protocol (nested data) — serg_zhd
– serg_zhd, Commented Jul 13, 2018 at 10:01

Nimantha · Accepted Answer · 2021-11-03 08:41:43Z

2

I assume that you have json in Data format and All field Optional

Create following decodable json model class which are used to decode your json data.

struct PictureJson: Decodable {
    var picture         : Data?
    var name            : String?
    var last_name       : String?
    var id              : String?
    var first_name      : String?
}

struct Data: Decodable {
    var data            : ImageData?
}

struct ImageData : Decodable {
    var height          : Int?
    var is_silhouette   : Bool?
    var url             : String?
    var width           : Int?
}

And write following code to decode your json

do {
    let picture = try JSONDecoder().decode(PictureJson.self, from: jsonData!) as? PictureJson
     print(picture!.picture!.data)
        
} catch {
    // print error here.  
}

edited Nov 3, 2021 at 8:41

Nimantha

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answered Jul 13, 2018 at 7:09

Sagar Chauhan

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2 Comments

George Heints Over a year ago

i get this error now... "Cannot convert value of type 'JSON' to expected argument type 'Data'" i got JSON from FB auth..

Sagar Chauhan Over a year ago

@GeorgeHeints, Please check JSON's super class and make sure it should be data. If JSON is [String: Any] then your need to encode it to data form.

Chandan Jee · Accepted Answer · 2021-10-05 11:28:31Z

2

I will suggest url for creating model.

here you put your json then convert.

answered Oct 5, 2021 at 11:28

Chandan Jee

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1 Comment

pw2 Over a year ago

jsoncafe.com does not exist anymore

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