title: setting the first responder view of the table but we don't know its type (cell/header/footer)
body: <p>I have <strong>UITableViewController</strong>. In this controller I add a subview UIView with UITextField in it. When the UITextField get first responder got </p>
  
  <blockquote>
    <p>setting the first responder view of the table but we don't know its
    type (cell/header/footer)</p>
  </blockquote>
  
  <p>Code as below:</p>
  
  <pre><code>@interface UserAlbumListViewController (){
      NSString *newAlbumName;
      UITextField *albumNameField;
  }
  
  @end
  
  -(void)addAlbumButtonPressed:(id)sender{
  self.tableView.scrollEnabled = NO;
  CGRect frame = self.view.frame;
  UIView *opaqueView = [[UIView alloc] initWithFrame:frame];
  opaqueView.tag = 1001;
  opaqueView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
  
  
  UIView *controllerView = [[UIView alloc] init];
  controllerView.tag = 1002;
  controllerView.backgroundColor = [UIColor whiteColor];
  controllerView.frame = CGRectMake(10.0f, 60.0f, frame.size.width - 20.0f, 90.0f);
  [opaqueView addSubview:controllerView];
  
  albumNameField = [[UITextField alloc] init];
  albumNameField.borderStyle = UITextBorderStyleRoundedRect; 
  albumNameField.placeholder = NSLocalizedString(@"Album Name",nil);
  albumNameField.keyboardType = UIKeyboardTypeDefault;
  albumNameField.returnKeyType = UIReturnKeyDefault;
  albumNameField.autocorrectionType = UITextAutocorrectionTypeNo;
  albumNameField.autocapitalizationType = UITextAutocapitalizationTypeNone;
  albumNameField.clearButtonMode = UITextFieldViewModeWhileEditing;
  albumNameField.clearsOnBeginEditing = NO;
  albumNameField.text = @"";
  albumNameField.frame = CGRectMake(10.0f , 10.0f, controllerView.frame.size.width - 20.0f, 30.0f);
  [albumNameField becomeFirstResponder];
  [controllerView addSubview:albumNameField];
  
  
  UIButton *_cancelButton =  [UIButton buttonWithType:UIButtonTypeRoundedRect];
  _cancelButton.backgroundColor = [UIColor clearColor];
  [_cancelButton setTitle:NSLocalizedString(@"Cancel",nil) forState:UIControlStateNormal];
  _cancelButton.frame = CGRectMake( controllerView.frame.size.width - 90.0f,  albumNameField.frame.origin.y + albumNameField.frame.size.height + 10.0f, 80.0f, 30.0f);
  
  [_cancelButton addTarget:self action:@selector(opaqueViewCancelButtonClicked:) forControlEvents:UIControlEventTouchDown];
  [controllerView addSubview:_cancelButton];
  
  UIButton *_OKButton =  [UIButton buttonWithType:UIButtonTypeRoundedRect];
  _OKButton.backgroundColor = [UIColor clearColor];
  [_OKButton setTitle:NSLocalizedString(@"OK",nil) forState:UIControlStateNormal];
  _OKButton.frame = CGRectMake( _cancelButton.frame.origin.x - 90.f, _cancelButton.frame.origin.y, 80.0f, 30.0f);
  [_OKButton addTarget:self action:@selector(opaqueViewOKButtonClicked:) forControlEvents:UIControlEventTouchDown];
  [controllerView addSubview:_OKButton];
  
  [self.view addSubview:opaqueView];
  
  [controllerView release];
  [opaqueView release];
  }
  </code></pre>
  
  <p>How to avoid this warning?</p>