Passing data/variable declared from HTTP request data to another View Controller-CodePudding

Summary:

In my login view controller for my first screen, I have it set up to where when a user hits "Sign in" it will run a function that takes in a username and password and POSTs those into my backend with an HTTP request. Then from that request in that function, in the response back there is a "user_id" within the data. I need to somehow set that "user_id" that comes back to a variable so that I can use it throughout the app. For example, whenever I make any requests in the app, I need that "user_id" to plug into URLs to fetch data for a user's account. I will include code snippets.

This first one is from my login function. As you can see from the last print, that is how to parse to get to the "user_id" from the response.

            let decoder = JSONDecoder()
            let loginResponse = try decoder.decode(LoginResponse.self, from: json)
            print(loginResponse.data)
            print(loginResponse.data.id)

This next one is from an instance where I need to take that "user_id" and plug it into a URL for another HTTP Request in another file.

    let resourceString = "https://*******.herokuapp.com/\(userID)/allergies"
    guard let resourceURL = URL(string: resourceString) else {fatalError()}

Any help would be much appreciated and let me know if I need to provide any more information.

CodePudding user response：

Normally you have more validation and security to reach the backend. Like, auth / bearer tokens / refresh tokens. I tend to save these in a Authenticator singleton which is used in my requestBuilder protocol.

If you want to save the userID even if they shut down the app for some time, then i agree with @luffy_064 that should save it in UserDefault or CoreData.

Since it's just 1 key, i would prefer UserDefault as it's quick and simple. Keychain is more of a lifetime thingy. Which i wouldn't suggest for an userid, but maybe if they want to save their password.

CodePudding user response：

Yes, you can save access token or user id in Userdefaults and check whether the user logged in or not or to use it in next request

UserDefaults.standard.set(loginResponse.data.id, forKey: "userId")

To get it use

let userId = UserDefaults.standard.value(forKey: "userId")