Why the signal is called twice in ReactiveCocoa?

Question

I\'m implementing my first code with https://github.com/ReactiveCocoa/ReactiveCocoa.

Is for login a user. The line [subscriber sendNext:user]; is called twi

Answer 1

This happens because the block passed to +[RACSignal createSignal:] executes whenever a subscription to the signal is made, and your code creates two separate subscriptions:

[login subscribeCompleted:^{ ... }];

[login subscribeError:^(NSError *error) { ... }];

If you only want to create a single subscription, use the method -[RACSignal subscribeError:completed:]:

[login subscribeError:^(NSError *error) {
        [SVProgressHUD dismiss];

        [AppUrls alertError:LOC_ERROR_LOGING msg:error.userInfo[@"error"]];
    }
    completed:^{
        [[NSNotificationCenter defaultCenter]
         postNotificationName:NOTIFY_LOGIN_CHANGED
         object:self];

         [SVProgressHUD showSuccessWithStatus:LOC_OK];


         [self cancelForm];
    }];