swift json parsing, no titles for json objects - swift

Question

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?

Answer 1

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)

Answer 2

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)