我正在使用；swiftSDK0.2.0和swift3.1所以，在我的viewcontroller(initial.swift)上我已经importUIKitimportFacebookCoreimportFacebookLogin...overridefuncviewDidLoad(){ifletaccessToken=AccessToken.current{print("Userisalreadyloggedin")...}else{letloginButton=LoginButton(readPermissions:[.publicProfile,.email])loginButt