Issue displaying array data inside UIAlert View - arrays

Question

Essentially I would like to parse the JSON received from a url and display the data inside of alert popup.
I am able to do this with a simple array below but don't know how this can be done with an JSON array from a URL.
Currently working:
let jsonObj:[String: Any] = ["error": [
"email": ["The email has already been taken."],
"phone": ["The phone has already been taken."]]
]
if let errorMsgs = jsonObj["error"] as? [String: [String]] {
let errMsg = errorMsgs.values.map { $0.reduce("", +) }.joined(separator: "\n")
print(errMsg)
self.presentAlert(withTitle: "Try again", message: errMsg)
}
JSON Array:
var structure = [Struct]()
private func fetchJSON() {
guard let url = URL(string: "url.com")
else { return }
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = "code=\(codeValue)".data(using: .utf8)
URLSession.shared.dataTask(with: request) { data, _, error in
guard let data = data else { return }
do {
self.structure = try JSONDecoder().decode([Struct].self,from:data)
}
catch {
print(error)
}
}.resume()
}
struct Struct: Decodable {
let id: Int
let reasons: String
}
Sample JSON Array:
[
{
"id": 1,
"reasons": "Test"
},
{
"id": 3,
"reasons": "Test"
}
]
How can I get the reasons string from the array to populate in the alert similar to above.
UPDATE:
To Print the records in the alert I have done the following but it only prints one record in the alert:
for item in self.structure {
print(item.reasons)
let errMsg = [item.reasons].compactMap { $0 }.joined(separator: "\n")
self.presentAlert(withTitle: "Try again", message: errMsg)
}

Answer 1

Here I have created example from your code.
First of all replace your Codable with:
// MARK: - Reason
struct Reason: Codable {
let id: Int
let reasons: String
}
typealias Reasons = [Reason]
Here is your server response in JSON String formate:
let json = """
[
{
"id": 1,
"reasons": "Test"
},
{
"id": 3,
"reasons": "Test"
}
]
"""
Then I have converted it to Data only for testing purpose:
let data = json.data(using: .utf8)!
And you can parse it with
do {
self.reasonsData = try JSONDecoder().decode(Reasons.self, from:data)
for item in self.reasonsData {
print(item.reasons) //This will print reasons.
}
}
catch {
print(error)
}
UPDATE:
If you want all reasons in one string then replace
for item in self.reasonsData {
print(item.reasons)
}
with
let errMsg = self.reasonsData.compactMap { $0.reasons }.joined(separator: "\n")