I want to use salesforce mobile SDK into existing project. How to use the oauth2  mobile SDK in existing project. I tried to use the SFCoodinator Class (ios) in my project i was put the login Webview generated by the oauth library in my viewcontroller, i was to login and i get a screen which ask permission to access the data when i press allow i go white sceen and my SFCoordinatorDelegate didAuthenticate method is not called