ios - Can't Save Snapshot to Data Model? -

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in viewcontroller file, had following code:

    self.rootref.child("users/").child("stringkey").observeeventtype(.value, withblock: { snapshot in         self.usera.name     = snapshot.value!.objectforkey("name") as? string         self.usera.urlone   = snapshot.value!.objectforkey("urlone") as? string         self.usera.urltwo   = snapshot.value!.objectforkey("urltwo") as? string     })      print(self.usera.name)     print(self.usera.urlone)     print(self.usera.urltwo)

but reasons unknown me, output empty. when put print statements inside observer event, desired output. why aren't allowed save snapshot data model?

[observeeventtype] processed in background , print commands on main thread. need saving in background thread or use method completion handler


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