CODEWITHSUNDEEP
iosswiftfirebasefirebase-authenticationcompletionhandler
Douglas W. Palme
Douglas W. Palme

Reputation: 570

Completion Block Error Generated when accessing User account in Firebase

I am attempting to create a completion block while pulling a users profile from a firebase table. I need it to complete before I allow it to pass back a value.

Here is what I have so far:

func getProf(email: String, pass: String, completionBlock: @escaping (_ success: Bool) -> (Int)) {
        let ref = Database.database().reference()
        let userID = Auth.auth().currentUser?.uid
        ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
            let value = snapshot.value as? NSDictionary
            self.zDaily = value?["qday"] as? Int ?? 0
        }) {
            if let error = error {
                completionBlock(false)
            } else {
                completionBlock(true)
                return zDaily
            }
        }
        
    }

I'm getting the following error:

Cannot convert value of type '() -> _' to expected argument type '((Error) -> Void)?'

I'm not sure how to fix this, any suggestion would be appreciated.

Upvotes: 0

Views: 97

Answers (1)

Torewin
Torewin

Reputation: 907

I'm not sure if that'll fix the error. If it doesn't, then I think I know the issue and it would be with your error block and your observeEvent.

Edit: Just made a change to return an error object from the observeEvent.

 func getProf(email: String, pass: String, completionBlock: @escaping (Bool, Int) -> ()) {
            let ref = Database.database().reference()
            let userID = Auth.auth().currentUser?.uid
            ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
                let value = snapshot.value as? NSDictionary
                self.zDaily = value?["qday"] as? Int ?? 0
            }) { (error) in //Added return error value - this may fix your error
                if let error = error {
                    completionBlock(false, 0) //Add default 0 to return if error
                } else {
                    completionBlock(true, zDaily) //Added zDaily as Int to return
                    //return zDaily - return will not return in async function so you can return the value in completionBlock above.
                }
            }
            
        }

Upvotes: 1

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