Ufdjrw

So I got a pretty hard problem to tackle. My JSON code has a pretty weird structure. It has the following structure:

 "title": [
 [
 "Temperature",
 "9 u00b0C (283 u00b0F)",
 "Good"
 ],
 [
 "Visibility",
 "10 KM (6.2 Mi)",
 "Good"
 ]
 ]

With the following code I was able to print out some easy json code:

import UIKit

struct WeatherItem: Decodable 
 let title: String?
 let value: String?
 let condition: String?


class ViewController: UIViewController 
 override func viewDidLoad() 
 super.viewDidLoad()

 let jsonUrlString = "http://somelinkhere"
 guard let url = URL(string: jsonUrlString) else return 

 URLSession.shared.dataTask(with: url) (data, response, err) in
 guard let data = data else return 

 do 
 let weather = try JSONDecoder().decode(WeatherItem.self, from: data)
 print(weather.title)
 catch let jsonErr
 print("error", jsonErr)
 
 .resume()
 

But the problem is that my output for all 3 variables, title, value and condition nil is.
I am sure I have to change the struct code, but I don't know in what way.

How do I get to JSON code with no title?

You will have to write the decoding initializer by yourself:

struct WeatherData: Decodable 
 let title: [WeatherItem]


struct WeatherItem: Decodable 
 let title: String?
 let value: String?
 let condition: String?

 public init(from decoder: Decoder) throws 
 // decode the value for WeatherItem as [String] 
 let container = try decoder.singleValueContainer()
 let components = try container.decode([String].self)

 title = components.count > 0 ? components[0] : nil
 value = components.count > 1 ? components[1] : nil
 condition = components.count > 2 ? components[2] : nil
 


let json = """

 "title": [
 ["Temperature", "9", "Good"],
 ["Visibility", "10 KM (6.2 Mi)", "Good"]
 ]

"""

let jsonData: Data = json.data(using: .utf8)!
let decoder = JSONDecoder()

let decoded = try! decoder.decode(WeatherData.self, from: jsonData)
debugPrint(decoded)

Correct json

 "title": [
 [
 "Temperature",
 " ",
 "Good"
 ],
 [
 "Visibility",
 "10 KM (6.2 Mi)",
 "Good"
 ]
 ]

var arr = [WeatherItem]()
do 
 let res = try JSONDecoder().decode([String:[[String]]].self, from: data)
 let content = res["title"]!
 content.forEach 
 if $0.count >= 3 
 arr.append(WeatherItem(title:$0[0],value:$0[1],condition:$0[2]))
 
 
 print(arr)
 catch 
 print(error)

Discussion : your root object is a dictionary that contains 1 key named title and it's value is an array of array of strings or from the model logic it's an array of model named WeatherItem but isn't structured properly for it , so using this

let weather = try JSONDecoder().decode(WeatherItem.self, from: data)

won't work as the current json does't contain keys value and condition

A proper strcuture would be

[
 
 "title":"Temperature" ,
 "value":"",
 "condition":"Good"
 ,
 
 "title":"Visibility",
 "title":"10 KM (6.2 Mi)",
 "condition":"Good"
 
]

and that will enable you to do

let weather = try JSONDecoder().decode([WeatherItem].self, from: data)

To decode an array using Decoder() in swift. you do something like this:

let decoder = JSONDecoder()
do 
 let array = try decoder.decode([WeatherItem].self, from: data)
 print(array)
 catch 
 // handle errors