Setting a global variable inside a method

Asked Jun 18 '18 at 15:04

Active Jun 18 '18 at 15:10

Viewed 29 times

//Global variable:
var senderString = ""

 override func viewDidLoad() {
...
set()
print(senderString)
}

func set() {
    if Auth.auth().currentUser?.uid == nil{
        logout()
    } else{
        let uid = Auth.auth().currentUser?.uid
        let ref = Database.database().reference()
        ref.child("users").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
            if let dic = snapshot.value as? [String: AnyObject] {
                self.senderString = dic["username"] as! String
                print("this"+self.senderString)
            }
            })
    }

}

How do i set the global variable senderString to dic["username"] as! String ? I want the senderString global variable to reflect the username.

edited Jun 18 '18 at 15:10

asked Jun 18 '18 at 15:04

Lionel Tan

use `var senderString` – Aju Antony Jun 18 '18 at 15:07
@CoderFrom94 It is var, it got crop out – Lionel Tan Jun 18 '18 at 15:08
Then this should be working fine, what seems to be the problem? – Aju Antony Jun 18 '18 at 15:09
@CoderFrom94 When i print(senderString) in viewdidload it is getting nil. However,in the method when i print ("this..") it is giving me the username. Thus,i think i did something wrongly. – Lionel Tan Jun 18 '18 at 15:10
is it nil or is it ""? I am pretty sure it will be an empty string rather than username – Aju Antony Jun 18 '18 at 15:15
@CoderFrom94 Emptystring – Lionel Tan Jun 18 '18 at 15:16
You're running into this issue, because `observeSingleEvent` is an asynchronous method, so you're trying to access the return value from it before a value would be assigned. – Dávid Pásztor Jun 18 '18 at 15:16
@DávidPásztor Got it thks – Lionel Tan Jun 18 '18 at 15:23

Setting a global variable inside a method

0 Answers0