Question

I want to use UIPickerView with 2 components, in which the second component value will be dependent on the first component value, like if in the first component Group 1 is selected then in the second component the group 1 values should be shown.

After selecting the values from both components value will be assigned to a UITextField or UILabel and the picker will be hidden.

(I have a main view in which I have added a subview to add the UIPickerView).

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

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{
    if (component==0)
    {
        return [vGroup count];
    }
    else
    {
        return [vehiclePickerList count];
    }
}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    switch (component) 
    {
        case 0:
            return [vGroup objectAtIndex:row];
            break;
        case 1:
            return [vehiclePickerList objectAtIndex:row];
            break;
    }
    return nil;
}

Answer 1

Please provide some code what you have written. For component-related issues, use - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView.

Store corresponding values (which you want to show in component 2) of each row of component 1 in an array of dictionary, and load values from there.