Multiple methods to init object? - ios

Question

I have a model which uses init with JSON, so that i can create objects directly from an API response.
However in this instance I want to init the model and manually enter its properties, hence it wont be JSON.
How can i have another init method that allows me to not use the standard JSON method and instead manually enter my params?
The model looks like this...
class Conversation: NSObject {
var id: String
var index: String
var image: String
var firstname: String
var lastname: String
var withuserid: String
var badgeCount: String
init?(_ json: JSON) {
guard let id = json["id"].string,
let index = json["index"].string,
let image = json["image"].string,
let firstname = json["firstname"].string,
let lastname = json["lastname"].string,
let withuserid = json["withuserid"].string,
let badgeCount = json["badgeCount"].string
else { return nil }
self.id = id
self.index = index
self.image = image
self.firstname = firstname
self.lastname = lastname
self.withuserid = withuserid
self.badgeCount = badgeCount
}
}

Answer 1

Just add another init since you can several ones for a struct and class Then just call the desired one:
class Conversation: NSObject {
var id: String
var index: String
var image: String
var firstname: String
var lastname: String
var withuserid: String
var badgeCount: String
init?(_ json: JSON) {
guard let id = json["id"].string,
let index = json["index"].string,
let image = json["image"].string,
let firstname = json["firstname"].string,
let lastname = json["lastname"].string,
let withuserid = json["withuserid"].string,
let badgeCount = json["badgeCount"].string
else { return nil }
self.id = id
self.index = index
self.image = image
self.firstname = firstname
self.lastname = lastname
self.withuserid = withuserid
self.badgeCount = badgeCount
}
init(id: String, index: String, image: String, firstName: String, lastName: String, withUserId: String, badgeCount: String) {
self.id = id
self.index = index
self.image = image
self.firstName = firstName
self.lastName = lastName
self.withUserId = withUserId
self.badgeCount = badgeCount
}
}

Answer 2

A single class or struct can have several designated initializers in Swift.
Then you can call the non-JSON init method like this:
let conv = Conversation(id: "asbe", index: "1", "image: "img", firstName: "John", lastName: "Smith", withUserId: "21", badgeCount: "5"
class Conversation {
var id: String
var index: String
var image: String
var firstName: String
var lastName: String
var withUserId: String
var badgeCount: String
init(id: String, index: String, image: String, firstName: String, lastName: String, withUserId: String, badgeCount: String){
self.id = id
self.index = index
self.image = image
self.firstName = firstName
self.lastName = lastName
self.withUserId = withUserId
self.badgeCount = badgeCount
}
init?(_ json: JSON) {
guard let id = json["id"].string,
let index = json["index"].string,
let image = json["image"].string,
let firstname = json["firstname"].string,
let lastname = json["lastname"].string,
let withuserid = json["withuserid"].string,
let badgeCount = json["badgeCount"].string
else { return nil }
self.id = id
self.index = index
self.image = image
self.firstname = firstname
self.lastname = lastname
self.withuserid = withuserid
self.badgeCount = badgeCount
}
}
Some general advice: I don't see any reason for the class to inherit from NSObject. Swift classes don't need to inherit from any class, so unless you explicitly need a method from another class, don't make your custom classes inherit from others for no reason.
Please make sure you conform to the Swift naming convention, which is lower-camelCase for variable names. I would also rethink the types of some of the variables, without more context, it seems to me, some of them should be of type Int instead of String.