How to change the picker rows based on another picker's selection?

Question

I have two pickers - country and region. I need to populate the region picker based on the row selected in the country picker. I have arrays to populate both the pickers. I need some help to change the rows of region picker based on the country picker's selection. Any help would be greatly appreciated. Thanks a lot in advance.

Answer 1

Ok You have two pickers lets say countryPicker and regionPicker.

in the delegate method for UIPickerView add one condition

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{ 
    NSString *pickerTitle = @"";
    if (pickerView == countryPicker)
    {
        pickerTitle =  [countryFeeds objectAtindex:row];
        //assigns the country title if pickerView is countryPicker
    }
    else if (pickerView == regionPicker)
    {
        pickerTitle =  [regionFeeds objectAtindex:row];
        //assigns the region title if pickerView is regionPicker
    }

    return pickerTitle;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if (pickerView == countryPicker)
    {
        //selects the region corresponding to the selected country.
        //totalRegions is a NSDictionary having country names as keys and array of their regions as values
        regionFeeds = [totalRegions objectForKey:[countryFeeds objectAtindex:row]];

        //Now reloading the regionPicker with new values.
        [regionPicker reloadAllComponents];
    }
    else if (pickerView == regionPicker)
    {
        // your code to select a region
    }
}

I hope this solves your problem :)
BR, Hari