view source
How to Integrate Facebook Login in iOS App
Integrating Facebook features into an app is nowadays a quite common task, and one of the most important steps in the integration process is the login functionality implementation. Logging in with Facebook not only allows you to attach a social characteristic into your app, but it can also be used as a login system instead of creating a custom one. By adding it you offer to users a familiar way to authenticate, considering that the majority of users use Facebook.