objective c - UITextField in UITableView: setting the first responder view of the table but we don't know its type (cell/header/footer) -

i have uitextfield inside of uitableviewcell, , want detect when user begins typing inside of uitextfield. set uitextfields delegate, when code runs, warning 'setting first responder view of table don't know type (cell/header/footer)' , uitextfield delegate methods dont called. how can uitextfield methods called?

-(void)tableview:(id)view willdisplaycell:(uitableviewcell *)cell forrowatindexpath:(nsindexpath *)indexpath {     if ((indexpath.section == 0) && (indexpath.row == 3)) {         uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(friendcelltapped)];         [tap setnumberoftapsrequired:1];         [cell addgesturerecognizer:tap];     }     else if ((indexpath.section == 0) && (indexpath.row == 4)) {         nslog(@"im called");         uitextfield *tagbox = [[uitextfield alloc] initwithframe:cgrectmake(50, 6, 225, 25)];         [tagbox setborderstyle:uitextborderstyleroundedrect];         [tagbox setreturnkeytype:uireturnkeydone];         tagbox.delegate = self;         [cell addsubview:tagbox];     }     else {         %orig;     } } 

i've done before creating uitextfield variable on uiviewcontroller class , setting uitableviewcell's textfield in tableview:cellforrowatindexpath. set delegate of uitextfield variable in viewdidappear:.

something this:

-(void)viewdidappear:(bool)animated {     [super viewdidappear:animated];      self.thetextfield.delegate = self; }  - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {    //load custom cell     self.thetextfield = mycustomcell.celltextfield;     return mycustomcell; } 

then uitextfielddelegate methods should called.