Ios swift class without instantiate

Question

How do you (if possible) create a class that anything that references it gets the same object?

So, if I had a LoginClass

and I dont want to create a new instance in each file but rather be able to just do

LoginClass.userID

in any file without first creating an instance of it?

Answer 1

It possible. Use singleton:

Stackoverflow question

Tutorial by Ray Wenderlich

Answer 2

You are looking for a Singleton

This is the code

class Login {
    static let sharedInstance = Login()
    var userID: String?
    private init() {}
}

This is how you retrieve the same instance

Login.sharedInstance

And this is how you use it

Login.sharedInstance.userID = "123"

In a different point of your code...

 print(Login.sharedInstance.userID) // 123

Answer 3

Creating one instance per application life cycle means you want to implement Singleton pattern. You can implement singleton like this

class LoginManager {
    static let sharedInstance = LoginManager()

    var userId:String?
    var name:String?

}

And now you can use this like

LoginManager.sharedInstance.userId