iphone - 1St value does not select in picker view -

hi iam having buttons when click 1 button picker view apper not select first value if scroll fist value selected plz me

here code

- (void)pickerview:(uipickerview *)thepickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component {        switch (tagvlaue) {      case 0:     {          if(gender==yes)        {             nslog(@"selected color: %@. index of selected color: %i", [checkarray objectatindex:row], row);             selectedgender=[checkarray objectatindex:row];            nslog(@"selected checkgender %@",selectedgender);            genderlabel.text=selectedgender;           // checkgender=no;        }      else           {               nslog(@"selected color: %@. index of selected color: %i", [genderarray objectatindex:row], row);               selectedgender=[genderarray objectatindex:row];              nslog(@"selected gender %@",selectedgender);              genderlabel.text=selectedgender;             // checkgender=yes;            }         //genderlabel     }         break;     case 1:     {         if(gender==no)         {         nslog(@"selected color: %@. index of selected color: %i", [seekingarray objectatindex:row], row);            selectedseek=[seekingarray objectatindex:row];         nslog(@"selected seeking %@",selectedseek);         seeklabel.text=selectedseek;         }         else {             nslog(@"selected color: %@. index of selected color: %i", [seekcheckarray objectatindex:row], row);              selectedseek=[seekcheckarray objectatindex:row];             nslog(@"selected seeking %@",selectedseek);             seeklabel.text=selectedseek;         }      }         break;      case 2:         nslog(@"selected color: %@. index of selected color: %i", [agearray objectatindex:row], row);          selectedage=[agearray objectatindex:row];         nslog(@"selected age %@",selectedage);         label.text=selectedage;           break;     case 3:         nslog(@"selected color: %@. index of selected color: %i", [feetarray objectatindex:row], row);           selectedheight=[feetarray objectatindex:row];         nslog(@"selected height %@",selectedheight);         heightlabel.text=selectedheight;           break;      case 4:          nslog(@"selected color: %@. index of selected color: %i", [weightarray objectatindex:row], row);             selectedweight=[weightarray objectatindex:row];         nslog(@"selected weight %@",selectedweight);         weightlabel.text=selectedweight;          break;      case 5:         nslog(@"selected color: %@. index of selected color: %i", [enthnicityarray objectatindex:row],row);           selectedethnicity=[enthnicityarray objectatindex:row];         nslog(@"selected weight %@",selectedethnicity);         ethnicitylabel.text=selectedethnicity;          break;      case 6:         nslog(@"selected color: %@. index of selected color: %i", [typearray objectatindex:row],row);           selectedtype=[typearray objectatindex:row];         nslog(@"selected weight %@",selectedtype);         typelabel.text=selectedtype;          break;       default:         break; } 

thanks advance

the delegate method:

- (void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component; 

is called when user explicitly select value in picker. must value selected in picker when picker first displayed yourself. example can @ picker data source.