SyncContentView

Create SyncContentView

This view observes the Realm app object. Either directs the user to login, or opens a realm with a logged-in user.

The 1st time we open the app there is no logged in user, so we'll check app.currentUser and show the ProgressView. This ProgressView will run an async task to await our app to login, using the Atlas App. Here we use .anonymous authentication, although we have several other ways to do authentication (configurable in Atlas).

Once the login succeeds, there will be a user in app.currentUser. As we're observing changes in app, we'll enter the if part and show a "Logged In!" Text

SyncContentView.swift

import SwiftUI
import RealmSwift

struct SyncContentView: View {
    // Observe the Realm app object in order to react to login state changes.
    @ObservedObject var app: RealmSwift.App

    var body: some View {
        if let user = app.currentUser {
            // If there is a user logged in
            Text("Logged in \(user)")
        } else {
            // If there is no user logged in, show the login view.
            ProgressView()
                .task{
                    do {
                        let myUser = try await app.login(credentials: .anonymous)
                    } catch {
                        print("\(error)")
                    }
                }
        }
    }
}

SyncContentView Preview

We need to inject an App, as SyncContentView observes the Realm app object, so we create a dummy RealmSwift.App with no App ID.

SyncContentView.swift

struct SyncContentView_Previews: PreviewProvider {

    static let app: RealmSwift.App? = RealmSwift.App(id: "none")

    static var previews: some View {
        SyncContentView(app: app!)
    }
}