title: UITextField inside UITableViewCell won't become first responder
body: <p>I use a UITableViewController to display the details of KoreanFood. The first cell is a custom UITableViewCell (OverviewCell) with an Image and two UITextFields, which I created and layout in Storyboard (AutoLayout).</p>
  <p>I subclassed UITableviewCell like this:</p>
  <pre><code>// OverviewCell.h
  
  @interface OverviewCell : UITableViewCell
  @property (strong, nonatomic) IBOutlet UITextField *englishTitleTF;
  @property (strong, nonatomic) IBOutlet UITextField *koreanTitleTF;
  @property (strong, nonatomic) IBOutlet UIImageView *myImageView;
  @property (strong, nonatomic) UIImage *thumbnail;
  </code></pre>
  <p>My textfields in Storyboard are set to enabled/UserInteractionenabled and the delegate is my TVC. When I create the cells I also do this in code:</p>
  <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
      if (indexPath.section == GENERAL_SECTION) {
          static NSString *overviewCellID = @&quot;overviewCell&quot;;
          OverviewCell *overviewCell = [tableView dequeueReusableCellWithIdentifier:overviewCellID forIndexPath:indexPath];
          
          overviewCell.englishTitleTF.text = self.generalInfo.titleEnglish;
          overviewCell.koreanTitleTF.text = self.generalInfo.titleKorean;
          overviewCell.englishTitleTF.enabled = YES;
          overviewCell.koreanTitleTF.enabled = NO;
          //BOOL test = [overviewCell.englishTitleTF becomeFirstResponder];
          overviewCell.koreanTitleTF.delegate = self;
          overviewCell.englishTitleTF.delegate = self;
         
          UIImageView *imageView = [[UIImageView alloc] initWithImage:self.generalInfo.thumbnail];
          overviewCell.myImageView = imageView;
          overviewCell.myImageView.frame = CGRectMake(25, 25, 95, 95);
          [overviewCell addSubview:overviewCell.myImageView];
  
          return overviewCell;
      }
  </code></pre>
  <p>The comment with the BOOL is NO, and I just don't know why... As I set the text and it's displayed correctly, I know the Outlets are set and the Cell isn't nil (I checked that).</p>
  <p>Why does this not become first responder?</p>
  <p>I also tried some suggestions inside the OverviewCell subclass like the hit test or implementing the setSelected: / setEditing: methods. But a becomeFirstResponder to the textField here doesn't change anything as well.</p>