Making two UIPickerView in relation to each other

Question

How do I programmatically setup up the UIPickerView in a view without using Interface Builder? Also having trouble understanding how to do two UIPickerView when I select a value from the first UIPickerView, second UIPickerView change these values? first UIPickerView country and seconde UIPickerView city.

Answer 1

Yes possible you can create array on city within country like
int select=0;

(
   india
       (
         city,
         .....,
       )
   Australia
       (
         City,
         ......,
    )
)

and use
picker

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
   if(picker==1)
   {
     return [arr_counry count];
   }
   else if(picker==2)
   {
     return [[arr_counry objectAtIndex:select] count];
   }

}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
  if(picker==1)
   {
     select=[arr_currency objectAtIndex:row];
    [picker reloadAllComponents];

   }
   else if(picker==2)
   {

   }
}