Connection is automatically closed when the App enter foreground from background about swiftr

[adamhartford]

Well, I can reproduce this. It also happens with Mobile Safari and a plain web client against my test SignalR server. Is it feasible to reconnect when the app enters the foreground?

[top2tech]

If I add manual reconnect on disconnected, it will reconnect after the app enters the foreground. Looks like this is a workaround.

The built in auto reconnect on disconnected seems not to kick in for this scenario.

[adamhartford]

Commit 1bd2784 to SwiftR.js removed the 5 second auto-reconnect. I did this so you could stop/start the connection yourself without it reconnecting automatically after you stop. This would mean you need to reconnect manually on the disconnected event. I could make an autoReconnect property that lets you opt in/out of this behavior.

I don't know if there's some best practice for doing this with SignalR. FWIW, in my own use, I've never needed to stop/start the connection, and always relied on a 5 second auto-reconnect.

[top2tech]

Thanks, the manual reconnect works well so far.

[adamhartford]

FYI, for anyone else that reads this: As of commit 8e3a34d, you could also use an error handler like this to reconnect on timeout:

connection.error = { error in 
  print("Error: \(error)")

  if let source = error?["source"] as? String where source == "TimeoutException" {
      print("Connection timed out. Restarting...")
      connection.start()
  }
}