Swift 3 : How to convert struct to Parameters - ios

Question

I have a struct as follows
struct UserInfo
{
var userId : Int
var firstName : String
var lastName : String
}
How do I serialize an instance of UserInfo to type Parameters?
var user = UserInfo(userId: 1, firstName: "John", lastName: "Skew")
// Convert user to Parameters for Alamofire
Alamofire.request("https://httpbin.org/post", parameters: parameters)

Answer 1

Just implement a dictionaryRepresentation computed variable or function:
struct UserInfo {
var userId : Int
var firstName : String
var lastName : String
var dictionaryRepresentation: [String: Any] {
return [
"userId" : userId,
"firstName" : firstName,
"lastName" : lastName
]
}
}
Usage:
var user = UserInfo(userId: 1, firstName: "John", lastName: "Skew")
let userDict = user.dictionaryRepresentation

Answer 2

You could use CodableFirebase library. Although it's main purpose is to use it with Firebase Realtime Database and Firestore, it actually does what you need - converts the value into dictionary [String: Any].
Your model would look the following:
struct UserInfo: Codable {
var userId : Int
var firstName : String
var lastName : String
}
And then you would convert it to dictionary in the following way:
import CodableFirebase
let model: UserInfo // here you will create an instance of UserInfo
let dict: [String: Any] = try! FirestoreEncoder().encode(model)

Answer 3

You cannot directly pass struct as parameter. You need to convert your struct into [String:Any]. I have added a new variable description that converts your content to dictionary
struct UserInfo
{
var userId : Int
var firstname : String
var lastname : String
var description:[String:Any] {
get {
return ["userId":userId, "firstname": self.firstname, "lastname": lastname] as [String : Any]
}
}
}
And the usage is
var user = UserInfo(userId: 1, firstname: "John", lastname: "Skew")
// Convert user to Parameters for Alamofire
Alamofire.request("https://httpbin.org/post", parameters: user.description)

Answer 4

If you're going to make parameters to be sent as a POST request then it should take a dictionary format as follows:
let userDict = ["userId" : user.userId, "firstname" : user.firstname, "lastname" : user.lastname]
This should work as "parameters" for your networking

Answer 5

In Swift 4 you can use Decodable/Codable Struct