//вход

[[FIRAuth auth] signInWithEmail:self.userNameTextField.text
                       password:self.passwordTextField.text
                     completion:^(FIRUser * _Nullable user, NSError * _Nullable error) {
                         if (!error) {

                         } else {
                             NSLog(@"Error %@", error.localizedDescription);
                         }
                     }];


//регистрация

NSString *email = self.emailRegistrationTextField.text;
NSString *password = self.passwordRegistrationTextField.text;

[[FIRAuth auth] createUserWithEmail:email
                           password:password
                         completion:^(FIRUser * _Nullable user, NSError * _Nullable error) {
                             if (!error) {

                                 self.fireUser = [[TSFireUser alloc] initWithDictionary:(NSDictionary *)user];

                             } else {
                                 NSLog(@"Error - %@", error.localizedDescription);
                             }
                         }];