Changing uitextfield return key type while editing

Question

I have 4 uitextfields that recognize when they are empty or complete. If complete they change their return key type to GO, else is the default one. The problem is the keyboard is not changing the key type even though i use the reloadinputview

- (void)viewDidLoad
{
    [super viewDidLoad];

    _fieldsArray = @[_nameField, _passwordField, _emailField, _usernameField];
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{

    NSRange textFieldRange = NSMakeRange(0, [textField.text length]);

    //NSLog(@"%d", !(NSEqualRanges(range, textFieldRange) && [string length] == 0));

    [self signUpFieldsAreValid:(!(NSEqualRanges(range, textFieldRange) && [string length] == 0) && [self validateSignUpFields:textField])];
    [textField reloadInputViews];
    return YES;
}
- (BOOL)textFieldShouldClear:(UITextField *)textField{

    [self signUpFieldsAreValid:NO];
    [textField reloadInputViews];
    return YES;
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    for (UITextField *aTextField in _fieldsArray) {
        if (aTextField.isFirstResponder) {

            aTextField.layer.borderWidth = 0.f;
            aTextField.layer.borderColor = nil;

        }
    }

    textField.layer.borderWidth = 1.f;
    textField.layer.borderColor = [UIColor colorWithRed:200.f/255.f green:0.f/255.f blue:4.f/255.f alpha:1.f].CGColor;

    return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    NSUInteger fieldIndex = [_fieldsArray indexOfObject:textField];

    [_fieldsArray[(fieldIndex + 1) % 4] becomeFirstResponder];

    return YES;
}

- (BOOL)validateSignUpFields:(UITextField *)firstResponder
{
    for (UITextField *aTextField in _fieldsArray) {
        if (!aTextField.text.length && ![aTextField isEqual:firstResponder]) {
            return NO;
        }
    }

    return YES;
}

- (void)signUpFieldsAreValid:(BOOL)valid
{
    NSLog(@"%d", valid);
    for (UITextField *aTextField in _fieldsArray) {

        if (valid) {
            aTextField.returnKeyType = UIReturnKeyGo;
        }
        else {
            aTextField.returnKeyType = UIReturnKeyDefault;
        }
    }
}

Answer 1

I used the following after changing the returnKeyType and it seemed to work very well in iOS7 and iOS6.1:

if ([self.textfieldOne isFirstResponder]) {
    [self.textfieldOne reloadInputViews];

}