Handle cancel button in facebook iOS using session - ios

Question

I tried to search this but couldn't find anything useful.
[FBSession setActiveSession:[[FBSession alloc] initWithPermissions:[NSArray arrayWithObjects:#"publish_actions,read_stream,user_hometown,user_birthday,email", nil]]];
[[FBSession activeSession] openWithBehavior:FBSessionLoginBehaviorForcingWebView completionHandler:
^(FBSession *session,FBSessionState state,NSError *error)
{
if(state == FBSessionStateOpen)
{
// use user's detail and post on Facebook
}
}];
Now this works fine for me. But what if user presses close/cancel button before logging into Facebook. I need to execute set of statements if user pressed cancel button. How can i do this.
Any help would be appreciated.

Answer 1

You can use Facebook error category and to handle errors refer this link
[FBSession openActiveSessionWithPublishPermissions:permissions defaultAudience:FBSessionDefaultAudienceEveryone allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status, NSError* error){
if(!error){
//success do something
}
else{
//Error
if([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryUserCancelled){
//user have pressed on cancel/close button
}
else {
//loging failed
}
}
}];

Answer 2

try this
[FBSession setActiveSession:[[FBSession alloc] initWithPermissions:[NSArray arrayWithObjects:#"publish_actions,read_stream,user_hometown,user_birthday,email", nil]]];
[[FBSession activeSession] openWithBehavior:FBSessionLoginBehaviorForcingWebView completionHandler:
^(FBSession *session,FBSessionState state,NSError *error)
{
if(state == FBSessionStateOpen)
{
// use user's detail and post on Facebook
}
else if(state == FBSessionStateClosed)
{
// if user not authenticated
}
else if(steate == FBSessionStateClosedLoginFailed)
{
}
}];

Answer 3

After calling the login function, eg:
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
NSArray *permissions = [NSArray arrayWithObjects:#"friends_photos",#"friends_birthday",#"email", nil];
return [FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session, FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
}
You can get the callback in the delegate meth9od , eg:
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState)state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
if(!error)
{
}
break;
case FBSessionStateClosed:
{
NSLog(#"FBSessionStateClosed");
[FBSession.activeSession closeAndClearTokenInformation];
}
break;
case FBSessionStateClosedLoginFailed:
{
NSLog(#"FBSessionStateClosedLoginFailed :- logged failed");
}
break;
default:
break;
}
[[NSNotificationCenter defaultCenter] postNotificationName:FBSessionStateChangedNotification
object:session];
if (error) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:#"Error: %#",
[AppDelegate FBErrorCodeDescription:error.code]]
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
}