Добавление метода в мой uitextfield в ячейке?

Я добавляю этот метод мой код для форматирования текстового поля. Я использую код ниже, чтобы попытаться добавить метод, но он не работает, что я делаю неправильно?

.файл H

NSString* phone_;
UITextField* phoneFieldTextField;
@property (nonatomic,copy) NSString* phone;

.файл м

@synthesize phone = phone_;

ViewDidLoad{
self.phone = @"";
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];

// Make cell unselectable and set font.
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.font = [UIFont fontWithName:@"ArialMT" size:13];

if (indexPath.section == 0) {

    UITextField* tf = nil;
    switch ( indexPath.row ) {
case 3: {
            cell.textLabel.text = @"Phone" ;
            tf = phoneFieldTextField = [self makeTextField:self.phone placeholder:@"xxx-xxx-xxxx"];
            phoneFieldTextField.keyboardType = UIKeyboardTypePhonePad;

            [self formatPhoneNumber:phoneFieldTextField.text deleteLastChar:YES];

            [cell addSubview:phoneFieldTextField];
            break ;
}
    // Textfield dimensions
    tf.frame = CGRectMake(120, 12, 170, 30);

    // Workaround to dismiss keyboard when Done/Return is tapped
    [tf addTarget:self action:@selector(textFieldFinished:) forControlEvents:UIControlEventEditingDidEndOnExit];

} 
}

// Textfield value changed, store the new value.
- (void)textFieldDidEndEditing:(UITextField *)textField {

//Section 1.
if ( textField == nameFieldTextField ) {
    self.name = textField.text ;
} else if ( textField == addressFieldTextField ) {
    self.address = textField.text ;
} else if ( textField == emailFieldTextField ) {
    self.email = textField.text ;
} else if ( textField == phoneFieldTextField ) {
    self.phone = textField.text ;
}else if ( textField == dateOfBirthTextField ) {
    self.dateOfBirth = textField.text ;
}

}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString* totalString = [NSString stringWithFormat:@"%@%@",textField.text,string];

// if it's the phone number textfield format it.
if(textField.tag == 10 ) {
    if (range.length == 1) {
        // Delete button was hit.. so tell the method to delete the last char.
        textField.text = [self formatPhoneNumber:totalString deleteLastChar:YES];
    } else {
        textField.text = [self formatPhoneNumber:totalString deleteLastChar:NO ];
    }
    return false;
}

return YES;
 NSLog(@"Testing should change character in range"); 
}

-(NSString*) formatPhoneNumber:(NSString*) simpleNumber deleteLastChar:(BOOL)deleteLastChar {

if(simpleNumber.length == 0) return @"";
// use regex to remove non-digits(including spaces) so we are left with just the numbers
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[s-()]" options:NSRegularExpressionCaseInsensitive error:&error];
simpleNumber = [regex stringByReplacingMatchesInString:simpleNumber options:0 range:NSMakeRange(0, [simpleNumber length]) withTemplate:@""];

// check if the number is to long
if(simpleNumber.length>10) {
    // remove last extra chars.
    simpleNumber = [simpleNumber substringToIndex:10];
}

if(deleteLastChar) {
    // should we delete the last digit?
    simpleNumber = [simpleNumber substringToIndex:[simpleNumber length] - 1];
}

// 123 456 7890
// format the number.. if it's less then 7 digits.. then use this regex.
if(simpleNumber.length<7)
    simpleNumber = [simpleNumber stringByReplacingOccurrencesOfString:@"(d{3})(d+)"
                                                           withString:@"() "
                                                              options:NSRegularExpressionSearch
                                                                range:NSMakeRange(0, [simpleNumber length])];

else   // else do this one..
    simpleNumber = [simpleNumber stringByReplacingOccurrencesOfString:@"(d{3})(d{3})(d+)"
                                                           withString:@"() -"
                                                              options:NSRegularExpressionSearch
                                                                range:NSMakeRange(0, [simpleNumber length])];

if (simpleNumber.length == 10 && deleteLastChar == NO) { [self resignFirstResponder];}

return simpleNumber;
NSLog(@"Testing format phone number"); 
}

#pragma mark - TextField
-(UITextField*) makeTextField: (NSString*)text
              placeholder: (NSString*)placeholder  {
UITextField *tf = [[UITextField alloc] init];
tf.placeholder = placeholder;
tf.text = text ;
tf.autocorrectionType = UITextAutocorrectionTypeNo ;
tf.autocapitalizationType = UITextAutocapitalizationTypeNone;
tf.adjustsFontSizeToFitWidth = YES;
tf.returnKeyType = UIReturnKeyDone;
tf.textColor = [UIColor colorWithRed:56.0f/255.0f green:84.0f/255.0f blue:135.0f/255.0f alpha:1.0f];
return tf ;
}