parsing json array in label swift 4 - json

Question

This is my JSON array
[
{
"dollar":"15000",
"date":"1397-12-12"
}
]
i want to show dollar and date values in two different label but i have this type mismatch error :
typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Dictionary<String, Any> but found an array instead.", underlyingError: nil))
this is my Struct :
struct Dollar_Date : Codable {
let dollar : String
let date : String
}
and this is my code in view controller :
func dollarLabel() {
let urlString = DOLLAR_DATE_BASE_URL
guard let url = URL(string: urlString) else { return }
// 2
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!.localizedDescription)
}
guard let data = data else { return }
do {
// 3
//Decode data
let JSONData = try JSONDecoder().decode(Dollar_Date.self, from: data)
// 4
print(JSONData.dollar)
//Get back to the main queue
DispatchQueue.main.async {
self.main_Price.text = JSONData.dollar
self.data_Label.text = JSONData.date
}
} catch let jsonError {
print(jsonError)
}
// 5
}.resume()
}

Answer 1

Try this:
guard let jsonArray = JSONData as? [[String: Any]] else {
return
}
print(jsonArray)
//Now get title value
guard let title = jsonArray[0]["title"] as? String else { return } print(title)

Answer 2

You get an error because your data contains an array of JSON (dictionary as well), not JSON itself.
So you can't decode with
let JSONData = try JSONDecoder().decode(Dollar_Date.self, from: data)
But you have to do it manually:
EDIT:
guard let json = data as? [[String:Any]] else{return}
Now you can retrieve dollars and date from all the elements of your array:
// These are because you have to access an element of the array
guard let dollar = json[0]["dollar"] as? String else {return}
guard let date = json[0]["date"] as? String else {return}
DispatchQueue.main.async {
self.main_Price.text = dollar
self.data_Label.text = date
}
if your data can contain multiple value (dollars-date couples) you have to loop your array. By the previous example, you should do:
for element in json{
guard let dollar = element["dollar"] as? String else {return}
guard let date = element["date"] as? String else {return}
// do some stuff with each value
}