Swift : not exiting Firebase observe fuction block

Question

Does not exit from the observe block.

Doesn't print hello or events.

Stuck on fetching from database.

Displays the data from Firebase but not outside the block.

For example :

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let databaseRef = FIRDatabase.database().reference()
    databaseRef.child("Events").queryOrderedByKey().observe(.childAdded, with: {
        snapshot in
        print(snapshot)
        var temp : event = event()
        temp.name = (snapshot.value as? NSDictionary)?["name"] as? String ?? ""
        temp.description = (snapshot.value as? NSDictionary)?["description"] as? String ?? ""
        temp.date = (snapshot.value as? NSDictionary)?["date"] as? String ?? ""
        temp.price = (snapshot.value as? NSDictionary)?["price"] as? String ?? ""
        temp.venue = (snapshot.value as? NSDictionary)?["venue"] as? String ?? ""
        temp.genre1 = (snapshot.value as? NSDictionary)?["genre1"] as? String ?? ""
        temp.genre2 = (snapshot.value as? NSDictionary)?["genre2"] as? String ?? ""
        temp.img = (snapshot.value as? NSDictionary)?["img"] as? String ?? ""

        self.events.append(temp)
        print(self.events)
    })
    print("Hello")
    print(self.events)
}

Thanks in advance!

See http://stackoverflow.com/questions/39067196/using-variables-outside-of-completion-block — Frank van Puffelen, Oct 25 '16 at 14:11

score 1 · Answer 1 · answered Oct 25 '16 at 12:43

Few things here:-

You are using, childAdded as the FIRDataEventType, and this query will only be fired when your Events node will get a value appended. If you want to access the present data in your Database node use value .
```
databaseRef.child("Events").queryOrderedByKey().observe(.value, with: {
```
print(self.events) statement outside the completionBlock: will not work since the made to firebase database are asynchronous , but only the print(self.events) statement inside the completionBlock is only going to work.
If the case is that your viewDidLoad is not called then maybe you are not on the right viewController at the time.

Swift : not exiting Firebase observe fuction block

1 Answers1