How do I read data from the Firebase Realtime DataBase

Question

I need to read the data every time it gets updated in the real-time database. Getting many errors with different codes I've tried from various tutorials online. I simply want to store the value in an integer that I can use in the rest of my code.

import SwiftUI
import FirebaseDatabaseSwift
import FirebaseDatabase
import Firebase

struct DataTest: View {
    let ref:DatabaseReference! = Database.database().reference()
    let offsetRef:DatabaseReference! = Database.database().reference().child("offset")
    var body: some View {
        
        self.offsetRef.observe(.value, with:  { DataSnapshot in
            print(DataSnapshot.value)
        })
        
    }
}