UIpicker array with changing values

I'm making an app that uses the picker to let the user pick age and few other inputs. for eg: i have a button age, when the user clicks it, the picker shows the age. i managed to add individual picker for all the inputs, how ever开发者_如何学Go i'm having problems setting different arrays for each picker.

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 
    if (pickerview == picker) {
        return [pickerViewArray objectAtIndex:row];
    }
    else if (pickerview == stagepicker)
        return [stagepickerarray objectAtInde:row];
    }
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
    if (thePickerView == picker){ return [pickerViewArray count]; }
    else if (thePickerView == stagepicker){ [stagepickerarray count]; }
}

the above method isn't working for me !. Am I doing this right ?

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 
    if (pickerview == picker) {

Doesn't it sound like pickerview should be written thePickerView instead?

return [stagepickerarray objectAtInde:row];

Doesn't it sound like objectAtInde should be objectAtIndex?

else if (thePickerView == stagepicker){ [stagepickerarray count]; }

Doesn't it sound like a return is missing somewhere?

Why not use one UIPickerView with multiple components? Something along the lines of:

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

NSInteger numberOfRows;

if (component == 0) {
     numberOfRows = [anArray count];
}
else if(component == 1) { 
    numberOfRows = [anotherArray count];
}
else { 
    numberOfRows = [aThirdArray count];
}

return numberOfRows;

}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

NSString *stringIndex = [NSString stringWithFormat:@"TEST"];
if(component == 0) {

   return stringIndex = [anArray objectAtIndex:row];
}

else if(component == 1) {
    return stringIndex = [anotherArray objectAtIndex:row];
}

else {
   return stringIndex = [aThirdArray objectAtIndex:row];
}

return stringIndex;

}