Facebook Login Demo using facebook core frameworks Install the Following Pod Files to Use the API
pod 'FacebookCore', '> 0.2'
pod 'FacebookLogin', '> 0.2'
pod 'FacebookShare', '> 0.2'
pod 'FBSDKCoreKit', '> 4.22.1'
pod 'FBSDKLoginKit', '> 4.22.1'
pod 'FBSDKShareKit', '> 4.22.1'