Preventing SwiftUI Previews from Syncing

This mysterious device is most likely the SwiftUI Preview Simulator. Simply closing XCode doesn’t guarantee that this preview simulator closes. In order to stop this from happening, you’ll need to prevent SwiftUI preview simulator from calling startSync.

If you want to check that your runtime is running as a SwiftUI preview, you can read the process environment variables like so:

let isPreview: Bool = ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"

To prevent your Ditto instance in the preview from syncing, ensure to wrap startSync() in an if clause like so:

let isPreview: Bool = ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"

if !isPreview {
  // non preview simulators and real devices can sync
  try ditto.startSync()
}