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How to listen for realtime updates using FirebaseFirestore within SwiftUI app

How to listen for realtime updates using FirebaseFirestore within SwiftUI app.

Solution

  • What you're looking for is called a snapshot listener. Effectively it's treated the same as with any other documents but it has a closure that allows you to respond to updated events on a particular document. It's general usage is this.

    db.collection("cities").document("SF")
.addSnapshotListener { documentSnapshot, error in
  guard let document = documentSnapshot else {
    print("Error fetching document: \(error!)")
    return
  }
  guard let data = document.data() else {
    print("Document data was empty.")
    return
  }
  print("Current data: \(data)")
}

    You should be able to look at the document snapshot to determine any changes in data, then respond to those changes. In your case you would reload the view.

    https://firebase.google.com/docs/firestore/query-data/listen