翻译In my Application there are three ways of login. one of them is login with facebook. But when I click on facebook button it ask me for accesing permissions, when click OK then it returs error FBErrorCategoryUserCancelled. And this is not happening on every devices, it happens on some devices. Here is my code -
if ([[FBSession activeSession]isOpen]) { /* * if the current session has no publish permission we need to reauthorize */ if ([[[FBSession activeSession]permissions]indexOfObject:@"publish_actions"] == NSNotFound) { [[FBSession activeSession] requestNewPublishPermissions:[NSArray arrayWithObject:@"publish_actions"] defaultAudience:FBSessionDefaultAudienceFriends completionHandler:^(FBSession *session,NSError *error){ [ProgressHUD dismiss]; self.view.userInteractionEnabled = YES; }]; }else{ [self fetchUserDetails]; } }else{ /* * open a new session with publish permission */ [FBSession openActiveSessionWithPublishPermissions:[NSArray arrayWithObject:@"publish_actions"] defaultAudience:FBSessionDefaultAudienceOnlyMe allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status, NSError *error) { if (!error && status == FBSessionStateOpen) { [self fetchUserDetails]; }else{ NSLog(@"error"); if ([FBErrorUtility shouldNotifyUserForError:error]) { alertTitle = @"Facebook Error"; alertMessage = [FBErrorUtility userMessageForError:error]; // This code will handle session closures that happen outside of the app // You can take a look at our error handling guide to know more about it // https://developers.facebook.com/docs/ios/errors } else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryAuthenticationReopenSession) { alertTitle = @"Session Error"; alertMessage = @"Your current session is no longer valid. Please log in again."; // If the user has cancelled a login, we will do nothing. // You can also choose to show the user a message if cancelling login will result in // the user not being able to complete a task they had initiated in your app // (like accessing FB-stored information or posting to Facebook) } else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryUserCancelled) { NSLog(@"user cancelled login"); alertTitle = @"Facebook Error"; alertMessage = @"System login cancelled"; // For simplicity, this sample handles other errors with a generic message // You can checkout our error handling guide for more detailed information // https://developers.facebook.com/docs/ios/errors } else { alertTitle = @"Something went wrong"; alertMessage = @"Please try again later."; NSLog(@"Unexpected error:%@", error); } [[[UIAlertView alloc] initWithTitle:alertTitle message:alertMessage delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show]; [ProgressHUD dismiss]; self.view.userInteractionEnabled = YES; } }]; }Any help will be appreciated.Thank you.