Firebase completion listeners in swift

Question

How do you execute a completion listener for firebase in swift? It says there are completion listers for SetValue and UpdateValue in the docs but there is no example.

Answer 1

• For setValue in Firebase you can write completion blocks as below:

  let ref = Database.database().reference().child("somepath")
  ref.setValue("value") { (error, databaseRef) in
     if error != nil {
         print("Error for setting value")
     } else {
         print("Value set successfully.")
     }
  }
  

• For updateValue in Firebase:

  let newKeyValueData:[String:Any] = ["key1":"value1", "key2":value2] as [String:Any]
  ref.updateChildValues(["someKey":"value"]) { (error, dbRef) in
     if error != nil {
         print("Error for updating value")
     } else {
         print("Value updated successfully.")
     }  
  }