Using API in Swift (Postman,Alamofire,SwiftyJson) - ios

Question

I have an admin panel which admin can insert question and gives 3 options of answers to users to choose. The admin is able to insert questions according to different chapters...its like a quiz game..The correct answer is then given an int value so in my collection of 3 buttons, I am able to know which is the correct button user has chosen. But now my problem is, in my Postman:
in my swift code
func getaQuestionaByaChapter(chapterName: String,question: String, answer1: String, answer2 : String, answer3: String, answer: Int, completion: #escaping (JSON?, Error?) -> Void) {
let parameters: [String : Any] = [
"secret_key" : "b3370e1590a2cf2b430e8cf8a8b361bd",
"_action" : "GETQUESTIONBYCHAPTER",
"GETQUESTIONBYCHAPTER" : chapterName,
"question" : question,
"option1" : answer1,
"option2" : answer2,
"option3" : answer3,
"answer" : answer
]
is this a declaration correct?
as for my storyboard:
and after this, i would be doing
button1.setTitle = answer1
questionlabel.text = question
in my swift file for the part where i link my API
import SwiftyJSON
import Alamofire
public class EduappRestClient {
enum ContentType: String {
case json = "application/json"
case jpeg = "image/jpeg"
case formEncoded = "application/x-www-form-urlencoded"
case none = "" //Content type will be empty
}
private static let url: URL = URL(string: "http://192.168.0.127:81/project/Online_Question/API/actiona")! //NSURL depreciated now using URL)
//singleton
static let sharedClient: EduappRestClient = EduappRestClient()
class func request(with url: URL,
method: HTTPMethod = .get,
parameters: Parameters? = nil,
contentType: ContentType = .json,
encoding: ParameterEncoding = JSONEncoding.default,
additionalHeaders: [String: String] = [:],
completion: #escaping(JSON?, Error?) -> Void
) {
//MARK: Configure Headers
var headers: [String: String] = [:]
//if contenttype is specified as none type, leave content-type header field empty
if contentType != .none {
headers["Content-Type"] = contentType.rawValue
}
for (key, value) in additionalHeaders {
headers[key] = value
}
Alamofire.request(url, method: method, parameters: parameters, encoding: encoding, headers: headers).responseJSON(completionHandler: { (response) in
guard response.result.error == nil, let value = response.result.value else {
completion(nil, response.result.error)
return
}
let jsonData = JSON(value)
completion(jsonData, nil)
})
}
//MARK: - Getting questions by chapters
func getaQuestionaByaChapter(chapterName: String,question: String, answer1: String, answer2 : String, answer3: String, answer: Int, completion: #escaping (JSON?, Error?) -> Void) {
let parameters: [String : Any] = [
"secret_key" : "b3370e1590a2cf2b430e8cf8a8b361bd",
"_action" : "GETQUESTIONBYCHAPTER",
"GETQUESTIONBYCHAPTER" : chapterName,
"question" : question,
"option1" : answer1,
"option2" : answer2,
"option3" : answer3,
"answer" : answer
]
let URLString = EduappRestClient.url
EduappRestClient.request(with: URLString, method: .post, parameters: parameters) { (json, error) in
guard error == nil, let json = json else {
completion(nil, error)
return
}
let result: JSON = json[1]
//result will print
//"question": [
// {
//"question": "10+10",
//"chapter_name": "Chapter 2",
//"option1": "10",
//"option2": "20",
//"option3": "30",
//"answer": "20"
//}
//]
completion(result, nil)
}
}}
it will show my data accordingly??

Answer 1

After API response, you have to use.
class QuestionModel: Codable {
let questions: [Details]
}
class Details: Codable {
let question: String?
let chapter_name: String?
let option1: Int?
let option2: Int?
let option3: Int?
}
And after this, you have to parse the response in the model data:
func getaQuestionaByaChapter(chapterName: String, completion: #escaping (QuestionModel?, Error?) -> Void) {
let parameters: [String : Any] = [
"secret_key" : "b3370e1590a2cf2b430e8cf8a8b361bd",
"_action" : "GETQUESTIONBYCHAPTER",
"GETQUESTIONBYCHAPTER" : chapterName
]
let URLString = EduappRestClient.url
EduappRestClient.request(with: URLString, method: .post, parameters: parameters) { (json, error) in
guard error == nil, let json = json else {
completion(nil, error)
return
}
do {
let jsonData = try JSONSerialization.data(withJSONObject: json, options: JSONSerialization.WritingOptions.prettyPrinted)
let result = try JSONDecoder().decode(QuestionModel.self, from: jsonData)
completion(result, nil)
} catch let message {
print("JSON serialization error:" + "\(message)")
}
}
}}
Then in QuizViewController: You have to set the data:
EduappRestClient.sharedClient.getaQuestionaByaChapter(chapterName: "Chapter 2", completion: { (response, error) in
//json is the result from rest client
let firstQuestion = response?.questions.first
self.questionsLabel.text = firstQuestion?.question
self.answerButtons.setTitle("\(firstQuestion?.option1)", for: UIControlState.normal)
self.answerButtons.setTitle("\(firstQuestion?.option2)", for: UIControlState.normal)
self.answerButtons.setTitle("\(firstQuestion?.option3)", for: UIControlState.normal)
})