Facebook登录要求安装（iPhone）

Question

I need help in the facebook login from Facebook-SDK-3.1 for iOS 6.I have used all the code of the Facebook sdk sample code sessionLoginSample ,I have used the WebView opening code in this and whenever i login from the new id ...it takes me to the below image link to install in my project .dont know what exactly it is...and if i do so and after that logout from the code ..and when I again press button to login , it automatically log-in without asking for the id and pssword``login page . and again again it automatically logs-in , even after logout./.can anyone help me why after being logout it ask stores the previous access token and password.

and code is

- (IBAction)buttonClickHandler:(id)sender {

AppDelegate* appDelegate = [[UIApplication sharedApplication]delegate];


if (appDelegate.session.isOpen) {

  [appDelegate.session closeAndClearTokenInformation];

} else {
    if (appDelegate.session.state != FBSessionStateCreated) {

         appDelegate.session = [[FBSession alloc] initWithPermissions:[NSArray arrayWithObjects:@"email", nil]];
    }


    [appDelegate.session openWithBehavior:FBSessionLoginBehaviorForcingWebView

                            completionHandler:^(FBSession *session,

                                                FBSessionState state,

                                                NSError *error) {

                FBSession.activeSession = session;



                                [self updateView];
                                NSLog(@" state=%d",state);

                                [FBRequestConnection
                                 startForMeWithCompletionHandler:^(FBRequestConnection *connection,
                                                                   id<FBGraphUser> user,
                                                                   NSError *error) {

                                     userInfo = @"";


                                     userInfo = user.username;

                                     NSLog(@"string %@", userInfo); 
                                         [self checkfacebook];





                                 }];


                            }];    } 


}

Answer 1

FB grants access to your app once the user logs in . If the user wants to modify the privileges he can do it by loggin into fb and changing permissions. You might want to look into oAuth for further details.

Answer 2

当你通过新的emailid登录时，它必须为他们安装你的应用程序...所以，它要求不同的登录...但是你再次登录它不会问...你的第二个问题的答案是......你在服务器端做某事...... bcoz服务器上可能有一个条款记住用户几小时或几天...所以，请检查服务器端..如果不使用服务器...回复我回来我会尝试进一步回答......