iOS How to use NSNumberFormatter for currency to print in UILabel

-(IBAction)buttonPressed1:(id)sender
    {
    double currency = [Amount1.text doubleValue] + [Amount2.text doubleValue]; 
    SumCurrency.text = [NSString stringWithFormat:@"%0.0f", answer];
    }

      -(IBAction)buttonPressed1:(id)sender
         {
        double currency = [Amount1.text doubleValue] + [Amount2.text doubleValue]; 
    NSNumberFormatter *numberFormatter = [[[NSNumberFormatter alloc] init] autorelease];
    [numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];
    NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithInt:currency]];
    SumCurrency.text = [NSString stringWithFormat:@"Converted:%@",numberAsString];	
        }