Logout from facebook in iOS app - ios

Question

I am creating a simple iOS App that Login to facebook, Fetch self and friends details, Logout from facebook.
Now Login from Facebook and Fetching self & friends details is working ok, but I am not able to logout fully from facebook. Whenever I logout and then Login back - I see the Authorization screen instead of Authentication Login screen of Facebook (of Web).
Below is my code - can you please see if there is something wrong in the steps I have performed from Login, to Fetching self & friends details and Logging out from facebook
1) Login to Facebook using below method
- (void)openSession
{
if(FBSession.activeSession.isOpen)
{
[FBSession openActiveSessionWithReadPermissions:nil
allowLoginUI:NO
completionHandler:
^(FBSession *session,
FBSessionState state, NSError *error)
{
[self sessionStateChanged:session state:state error:error];
}];
}
else
{
[FBSession openActiveSessionWithReadPermissions:nil
allowLoginUI:YES
completionHandler:
^(FBSession *session,
FBSessionState state, NSError *error)
{
[self sessionStateChanged:session state:state error:error];
}];
}
}
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
{
// Connection is Open
lblStatus.text = #"FBSessionStateOpen";
}
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:
{
[FBSession.activeSession closeAndClearTokenInformation];
// Connection is Closed / Login Failed
lblStatus.text = #"FBSessionStateClosed";
}
break;
default:
break;
}
}
2) Fetching self details and Friends details using below method
if (FBSession.activeSession.isOpen)
{
[[FBRequest requestForMe] startWithCompletionHandler:
^(FBRequestConnection *connection,
NSDictionary<FBGraphUser> *user,
NSError *error) {
if (!error) {
self.lblSelfDetails.text = user.name;
self.profilePicture.profileID = user.id;
}
}];
}
FBRequest *friendRequest = [FBRequest requestForGraphPath:#"me/friends?fields=name,birthday"];
[friendRequest startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error)
{
NSArray *data = [result objectForKey:#"data"];
for (FBGraphObject<FBGraphUser> *friend in data)
{
NSLog(#"%#:%#", [friend name],[friend birthday]);
}
}];
3) Logout using below method
- (IBAction)logout:(id)sender
{
[FBSession.activeSession closeAndClearTokenInformation];
}

Answer 1

Please use this method to logut successfully from the facebook
- (void)logout:(id<FBSessionDelegate>)delegate {
_sessionDelegate = delegate;
NSMutableDictionary * params = [[NSMutableDictionary alloc] init];
[self requestWithMethodName:#"auth.expireSession"
andParams:params andHttpMethod:#"GET"
andDelegate:nil];
[params release];
[_accessToken release];
_accessToken = nil;
[_expirationDate release];
_expirationDate = nil;
NSHTTPCookieStorage* cookies = [NSHTTPCookieStorage sharedHTTPCookieStorage];
NSArray* facebookCookies = [cookies cookiesForURL:
[NSURL URLWithString:#"https://m.facebook.com"]];
for (NSHTTPCookie* cookie in facebookCookies) {
[cookies deleteCookie:cookie];
}
if ([self.sessionDelegate respondsToSelector:#selector(fbDidLogout)]) {
[_sessionDelegate fbDidLogout];
}
}
Hope this helps you!!!

Answer 2

Add this mathod in appdelegate.m
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation
{
return [FBSession.activeSession handleOpenURL:url];
}
Then Add these methods in your .m file
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen: {
UIViewController *topViewController =
[self.navController topViewController];
if ([[topViewController modalViewController]
isKindOfClass:[SCLoginViewController class]]) {
[topViewController dismissModalViewControllerAnimated:YES];
}
}
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:
// Once the user has logged in, we want them to
// be looking at the root view.
[self.navController popToRootViewControllerAnimated:NO];
[FBSession.activeSession closeAndClearTokenInformation];
[self showLoginView];
break;
default:
break;
}
if (error) {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:#"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
}
- (void)openSession
{
[FBSession openActiveSessionWithReadPermissions:nil
allowLoginUI:YES
completionHandler:
^(FBSession *session,
FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
}
Next, create a new method that will close the current session and log a person out:
-(void)logoutButtonWasPressed:(id)sender
{
[FBSession.activeSession closeAndClearTokenInformation];
}