Checking for an active Facebook Session in viewDidAppear

Question

I have a UIViewController subclass called HomeController that is made the rootViewController in my application:applicationDidFinishLaunchingWithOptions.

My intended logical flow works like this:

1. If the user isn't signed in (determined by whether there's an open, active session using the FB iOS SDK), present a modal view controller asking them to sign in.

2. If they are signed in, display the HomeController view as normal.

I do a quick check using openSessionWithAllowLoginUI(false) in the app delegate to see whether a cached token exists, as well, which may yield me an active session if the app is reopened after having been closed.

I was placing the session check logic in viewDidAppear and presenting my modal view controller to login. But viewDidLoad logic still gets executed, and the data obviously isn't there for this to function correctly.

What's a better way to be doing this?

Thanks!

Answer 1

One thing you can do is to remove the code using the data fromviewDidLoad. You can have something like:

def viewDidLoad
  self.view.backgroundColor = UIColor.whiteColor # Or anything you want just to create background screen
end

def viewDidAppear(animated)
  if alreadyLoggedIn
    createViewAndDoSomethingWithData
  else
    showLogin
  end
end