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iOS

Stian Andreassen
Stian Andreassen
523 Points
Posted by Stian Andreassen
Stian Andreassen
523 Points

Swift3 - Get variable outside scope?

Hi,

I want to get the name and address from users in Firebase Database and write them back to Firebase in a different child.

I´m using this code to get the information I need:

`override func viewDidLoad() {
super.viewDidLoad()
ref = Database.database().reference()
let user = Auth.auth().currentUser!.uid

    //Read data from Firebase
   ref?.child("users").child(user).observeSingleEvent(of: .value, with: { (snapshot) in

        guard let userDict = snapshot.value as? [String: Any],
            let address = userDict["Address"] as? String,
            let name = userDict["Name"] as? String else {
                return
        }

        print(address + name)


    })


}`

That is working fine, but I want to write the values back when a button is pushed. And I can’t figure out how to access the variables outside the scope? I´m sure this is a elementary question, but I will be very grateful for any help in the matter.

1 Answer

Balazs Peak
Balazs Peak
46,160 Points
Balazs Peak
Balazs Peak
46,160 Points

try separating declaration and adding value. Declare outside of the function, and add the value inside. If you are doing so, your scope will be "global" and you can reach the variable from anywhere.

Stian Andreassen
Stian Andreassen
523 Points
Stian Andreassen
Stian Andreassen
523 Points

Thank you for your answer. I have tried to declare outside, and adding inside, but it don´t work. I´m sure I´m doing it wrong. I have just startet the courses here in treehouse, but it hasn't covered this part yet. Could you please help me out some more?

Balazs Peak
Balazs Peak
46,160 Points
Balazs Peak
Balazs Peak
46,160 Points

Of course! Feel free to ask! you can have me on facebook, just in case if I do not reply. facebook.com/balazspukli

Stian Andreassen
Stian Andreassen
523 Points
Stian Andreassen
Stian Andreassen
523 Points

Could you please help me out with declaring the constants outside the function so that they become globals, and I can reach them? I´m completely stuck with this :)

Balazs Peak
Balazs Peak
46,160 Points
Balazs Peak
Balazs Peak
46,160 Points

Could you please link the lesson/video you are refering to? I'm not familiar with swift very much, maybe I can work something out that way :)

Stian Andreassen
Stian Andreassen
523 Points
Stian Andreassen
Stian Andreassen
523 Points

I´m sorry. This isn't part of any lessonI have done yet, this is a problem I´m struggling with on my own.

Balazs Peak
Balazs Peak
46,160 Points
Balazs Peak
Balazs Peak
46,160 Points

Well, I'm thinking of something like this... I hope this makes sense and you can realize what did I different. Declaration in the outer scope, adding value inside...

`override func viewDidLoad() {

super.viewDidLoad()

ref = Database.database().reference()

let user = Auth.auth().currentUser!.uid

let address

let name

//Read data from Firebase

ref?.child("users").child(user).observeSingleEvent(of: .value, with: { (snapshot) in

    guard let userDict = snapshot.value as? [String: Any],

        address = userDict["Address"] as? String,

        name = userDict["Name"] as? String else {

            return
    }

    print(address + name)


})

}`