title: How to add clear button UITextfield?
body: <p>I would like to add a clear button inside a UITextfield but it doesn't show up.</p>
  
  <p>This the code for the UITextfield:</p>
  
  <pre><code>  @implementation databaseEnterDataViewController
  
  @synthesize customer = customer_ ;
  @synthesize type = type_ ;
  @synthesize code1 = code1_ ;
  @synthesize code2 = code2_ ;
  @synthesize background,
              changeType,
              codeOne,
              codeTwo,
              customers,
              suspendDisplayInfo,
              tf;
  
  
  #pragma mark -
  #pragma mark Initialization
  
  #pragma mark -
  #pragma mark View lifecycle
  
  - (void)viewDidLoad {
      [super viewDidLoad];
  
      self.customer = @"" ;
      self.type     = @"" ;
      self.code1    = @"" ;
      self.code2    = @"" ;
  
      self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Save" style:UIBarButtonSystemItemCancel target:self action:nil];
      self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:nil];
      self.navigationItem.title = @"Enter Data";
  
      code1Field_.clearButtonMode = UITextFieldViewModeWhileEditing;
      code2Field_.clearButtonMode = UITextFieldViewModeUnlessEditing;
      customerField_.clearButtonMode = UITextFieldViewModeAlways;
  
  
      [self openDB];
      [self createTable:@"barcodeScan" withField1:@"key" withField2:@"scanDate" withField3:@"theCustomer" withField4:@"type" withField5:@"theCode1" withField6:@"theCode2" withField7:@"discription" withField8:@"articleNr" withField9:@"batchNr" withField10:@"serialNr" withField11:@"expDate"];
  
      self.suspendDisplayInfo=false;
      NSLog(@"%@",typeLabel_.text);
  
  
  
  
  
  
  
  
  
  #ifdef LOG_FILE
      NSFileManager *fileManger = [NSFileManager defaultManager];
      if ([fileManger fileExistsAtPath:[self getLogFile]])
      {
          [debug appendString:[[NSString alloc] initWithContentsOfFile:[self getLogFile]]];
          [debugText setText:debug];
      }
  #endif
  
      dtdev=[Linea sharedDevice];
      [dtdev addDelegate:self];
      [dtdev connect];
  
  
  
  
      types = [[NSMutableArray alloc] init];
      [types addObject:@"Select barcode type"];
      [types addObject:@"Intervascular"];
      [types addObject:@"CID"];
      [types addObject:@"MAQUET"];
  
  
      [self pickerview];
  
      tf.clearButtonMode =UITextFieldViewModeAlways;
  
  
  }
  
  
  
  
  - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
      // Return the number of sections.
      return 1;
  }
  
  
  - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
      // Return the number of rows in the section.
      return 4;
  }
  
  
  // Customize the appearance of table view cells.
  - (UITableViewCell *)tableView:(UITableView *)tableView
           cellForRowAtIndexPath:(NSIndexPath *)indexPath {
      UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
  
      // Make cell unselectable
      cell.selectionStyle = UITableViewCellSelectionStyleNone;
  
       tf = nil;
      tf.clearButtonMode =UITextFieldViewModeAlways;
      changeType = [UIButton buttonWithType:UIButtonTypeRoundedRect];
      changeType.frame = CGRectMake(cell.frame.origin.x + 220, cell.frame.origin.y + 7, 80, 30);
      [changeType setTitle:@"Change type" forState:UIControlStateNormal];
      changeType.backgroundColor= [UIColor clearColor];
     [changeType.titleLabel setFont:[UIFont systemFontOfSize:14]];
      [changeType addTarget:self action:@selector(clickeButton:) forControlEvents:UIControlEventTouchDown];
  
  
      switch ( indexPath.row ) {
          case 0: {
              cell.textLabel.text = @"Customer:" ;
              tf = customerField_ = [self makeTextField:self.customer placeholder:@"Customer name"];
              [cell addSubview:customerField_];
  
  
              break ;
          }
          case 1: {
              cell.textLabel.text = @"Type:" ;
              tf = typeLabel_ = [self makeTextField:self.type placeholder:@"Type code"];
              [cell addSubview:typeLabel_];
              [cell addSubview:changeType];
  
              break ;
          }
          case 2: {
              cell.textLabel.text = @"Code 1:" ;
              tf = code1Field_ = [self makeTextField:self.code1 placeholder:@"Code 1"];
              [cell addSubview:code1Field_];
              break ;
          }
          case 3: {
              cell.textLabel.text = @"Code 2:" ;
              tf = code2Field_ = [self makeTextField:self.code2 placeholder:@"code 2"];
              [cell addSubview:code2Field_];
              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];
  
      // We want to handle textFieldDidEndEditing
      tf.delegate = self ;
  
      return cell;
  }
  
  
  
  
  
  -(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.textColor = [UIColor colorWithRed:56.0f/255.0f green:84.0f/255.0f blue:135.0f/255.0f alpha:1.0f];
      return tf ;
  }
  
  // Workaround to hide keyboard when Done is tapped
  - (IBAction)textFieldFinished:(id)sender {
      // [sender resignFirstResponder];
  }
  
  // Textfield value changed, store the new value.
  - (void)textFieldDidEndEditing:(UITextField *)textField {
      if ( textField == customerField_ ) {
          self.customer = textField.text ;
      }
      else if ( textField == typeLabel_ ) {
          self.type = textField.text ;
      }
      else if ( textField == code1Field_ ) {
          self.code1 = textField.text ;
      }
      else if ( textField == code2Field_ ) {
          self.code2 = textField.text ;
      }
  }
  </code></pre>
  
  <p>On the iphone it looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/E0bNF.png" alt="enter image description here"></p>
  
  <p>When I add the clear button like this </p>
  
  <p><code>customerField_.clearButtonMode = UITextFieldViewModeWhileEditing;</code></p>
  
  <p>the button doesn't show up.</p>
  
  <p>What should I do to make it visible?</p>