/Swift/Swift create a method who can return result or throw an error

Swift create a method who can return result or throw an error

class SecurityService {
  static func loginWith(email: String, password: String, callback: (error: NSError?, user: User?) -> Void) -> Void {

    let URL = ".."
    let params = [
      "email": email,
      "password": password
    ]

    HTTP.request(URL, method: "POST", params: params) { (error, result) in
      if let error = error {
        callback(error: error, user: nil)
      } else {
        guard let JSON = result else {
          let someDomain = "some_domain"
          let someCode = 100
          let someInfo = [NSLocalizedDescriptionKey: "No results were sent by the server."]

          let error = NSError(domain: someDomain, code: someCode, userInfo: someInfo)
          callback(error: error, user: nil)
          return
        }

        guard let name = JSON["name"] as? String, email = JSON["email"] as? String else {
          let someDomain = "some_domain"
          let someCode = 100
          let someInfo = [NSLocalizedDescriptionKey: "No user properties were sent by the server."]

          let error = NSError(domain: someDomain, code: someCode, userInfo: someInfo)
          callback(error: error, user: nil)
          return
        }

        let user = User(name: name, email: email)
        callback(error: nil, user: user)
      }
    }
  }
}

Source: stackoverflow.com

Similar codes

0 vote125 views1 answer
Swift VStack
Swift
1 vote119 views1 answer
Swift javascript injection
Swift
0 vote137 views1 answer
Xcode how to know which textfield is selected
Swift
1 vote179 views1 answer
Swift bring something to front of view
Swift
0 vote125 views2 answers
How to set the center in view in swift
Swift
0 vote130 views1 answer
Swift md5 cryptokit
Swift
0 vote169 views1 answer
Swift convert struct to string
Swift
1 vote128 views2 answers
Swift pop view controller
Swift
5 votes138 views1 answer
Round down swift
Swift
9 votes131 views2 answers
Font color swift
Swift