Unable to add parameter to API in swift - json

Question

I am getting parameter value from other viewcontroller, and i am getting parameter valueperfectly but which i am unable to add to API
here if i hardcode eventStatus then its working
and eventStatus value from otherviewcontroller also coming perfectly which i am unable to add to API
if i hard code like this its working
var eventType = "Draft"
let string = Constants.GLOBAL_URL + "/get/allevents/?eventstatus=\(self.eventType)"
Code: here i am getting correct eventStatus value but while breakpoint its control goes to else, why?
class EventsViewController: UIViewController {
var eventsListArray = [AnyObject]()
// var eventType = "Draft"
var eventType: String!
var eventList : EventsModel? = nil
#IBOutlet weak var eventsTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
getAllEventsList()
}
func getAllEventsList() {
DispatchQueue.main.async {
let headers = ["deviceid": deviceId,"userType": "personal","key": personalId]
DispatchQueue.main.async {
//let string = Constants.GLOBAL_URL + "/get/allevents/?eventstatus=\(self.eventType)"
let string = Constants.GLOBAL_URL + "/get/allevents"
var urlComponents = URLComponents(string: string)
let eventStatus = self.eventType
print("event status value in API call \(eventStatus)")
let requestEventType = URLQueryItem(name: "eventstatus", value: eventStatus)
urlComponents?.queryItems = [requestEventType]
let urlStr = urlComponents?.url
var request = URLRequest(url: urlStr!, cachePolicy: .useProtocolCachePolicy,timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers as! [String : String]
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
DispatchQueue.main.async {
if error == nil {
let httpResponse = response as? HTTPURLResponse
if httpResponse!.statusCode == 200 {
do {
let jsonObject = try JSONSerialization.jsonObject(with: data!) as! [String :Any]
print("publish event \(jsonObject)")
self.eventList = EventsModel.init(fromDictionary: jsonObject)
DispatchQueue.main.async {
if self.eventList?.events.count != 0 {
DispatchQueue.main.async {
self.eventsTableView.reloadData()
}
}
else {
DispatchQueue.main.async {
Constants.showAlertView(alertViewTitle: "", Message: "No Events \(self.eventType)", on: self)
self.eventList?.events.removeAll()
self.eventsTableView.reloadData()
}
}
}
} catch { print(error.localizedDescription) }
} else {
Constants.showAlertView(alertViewTitle: "", Message: "Something went wrong, Please try again", on: self)
}
}
}
})
dataTask.resume()
}
}
}
}
where i am wrong, why eventStatus value not adding to API.. please suggest me

Answer 1

it looks like you have a POST request and you need to use request data instead URL parameters.
HTTP Request in Swift with POST method here you can see:
let parameters: [String: Any] = [
"eventstatus": yourValue
]
request.httpBody = parameters.percentEncoded()
You also need to create parameters with eventStatus. And put it in
request.httpBody = parameters.percentEncoded()
If this endpoint on your server waits on this data in request body than you could not add it like a URL parameter.
Also, don't forget these 2 extensions from the example
extension Dictionary {
func percentEncoded() -> Data? {
return map { key, value in
let escapedKey = "\(key)".addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed) ?? ""
let escapedValue = "\(value)".addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed) ?? ""
return escapedKey + "=" + escapedValue
}
.joined(separator: "&")
.data(using: .utf8)
}
}
extension CharacterSet {
static let urlQueryValueAllowed: CharacterSet = {
let generalDelimitersToEncode = ":#[]#" // does not include "?" or "/" due to RFC 3986 - Section 3.4
let subDelimitersToEncode = "!$&'()*+,;="
var allowed = CharacterSet.urlQueryAllowed
allowed.remove(charactersIn: "\(generalDelimitersToEncode)\(subDelimitersToEncode)")
return allowed
}()
}

Answer 2

The solution must be obvious from the discussion in the comments. Although you seem a little puzzled so, I'm adding this to help you out. The value of eventType is never getting allocated to a value, it is remaining as nil unless you set it's value at a point in your code before the API call. So here is a way for you to figure this out:
let string = "https://www.google.com" + "/get/allevents"
var urlComponents = URLComponents(string: string)
let eventStatus = self.eventType ?? "Published" // here value is defaulted to "Published"
let requestEventType = URLQueryItem(name: "eventstatus", value: eventStatus)
urlComponents?.queryItems = [requestEventType]
let urlStr = urlComponents?.url
print(urlStr?.absoluteString)
Here, we're setting a default value for eventType for the scenario where eventType is nil.