how to solve uipickerview

Question

I have a problem with my pickerview where by clicking on the textfield it shows an empty uipickerview. I have 3 textfield where by clicking on each textfield there will be different array for each one. Here's the code:

- (void)viewDidLoad
{
    [super viewDidLoad];
    tbMode.inputView = pickerView;
    tbWalkDist.inputView = pickerView;
    tbRouteOpt.inputView = pickerView;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return YES;
}
-(void)textFieldDidBeginEditing:(UITextField*)textField;
{
    modeArray = [[NSMutableArray alloc] init];
    if(textField.tag==1){
        [modeArray addObject:@" A "];
        [modeArray addObject:@" B "];
        pickerView.hidden = NO;
    }
    else{
        if(textField.tag==2){
            [modeArray addObject:@" 300 "];
            [modeArray addObject:@" 400 "]; 
            [modeArray addObject:@" 500 "];
            pickerView.hidden = NO;
    }
        else{
            if(textField.tag==3){
                [modeArray addObject:@" cheapest "];
                [modeArray addObject:@" fastest "];
                pickerView.hidden = NO;
            }
            else{
                pickerView.hidden=YES;
            }
        }
    }    
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
    return 1;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:    (NSInteger)component
{
    tbMode.text = [modeArray objectAtIndex:row];
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
    return [modeArray count];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
    return [modeArray objectAtIndex:row];
}

pls help! where did i got wrong? is it possible that this method -(void)textFieldDidBeginEditing:(UITextField*)textField; is not called? thanks

edit* i miss out these 3 line of line which is for each textfield which use to call that method in viewDidLoad

tbMode.delegate = self;
tbWalkDist.delegate = self;
tbRouteOpt.delegate = self;

But I'm still getting an empty picker view. how can i add these NSMutableArray into the the picker view *add in [pickerView reloadAllComponents]; the picker will display the values :)

Answer 1

As for your output problem, you need to keep track of the uiTextField that activated. Add an ivar,

uiTextField *activeField;

set the variable to the appropriate uiTextField object in the textfield delegate method. Then replace,

tbMode.text = [modeArray objectAtIndex:row];

with,

activeField.txt = [modeArray objectAtIndex:row];

Set the ivar like so:

    -(void)textFieldDidBeginEditing:(UITextField*)textField
{
      activeField = textField;

      // all the if else logic here

}