displaying array of objects dynamically in 2 different pickerviews

Question

ya i am using pickerview but i dont want to display array of objects simply.instead i want that if i select an object in 1st picker so it should dynamically change and display its corresponding objects in 2nd picker below it.. plz help.. i am stuck with it from 2days.... thanks

Answer 1

It's kind of easy. Have a look at this implementation. Maybe this helps, if not, feel free to ask.

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 2;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    if (component == 0)
        return 2;
    return 5;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    if (component == 0) {
        if (row == 0)
            return @"A";
        if (row == 1)
            return @"B";
    }
    if (component == 1)
        return [pickerArray objectAtIndex:row];
    return @"FOO";
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    if (component == 0) {
        if (row == 0) {
            [pickerArray release];
            pickerArray = [[NSArray arrayWithObjects:@"Aa", @"Ab", @"Ac", @"Ad", @"Ae", nil] retain];
        }
        if (row == 1) {
            [pickerArray release];
            pickerArray = [[NSArray arrayWithObjects:@"Ba", @"Bb", @"Bc", @"Bd", @"Be", nil] retain];
        }
    }
    [pickerView reloadComponent:1];
}