问正确格式化两个UITextFields的货币

EN

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(formatCurrency)
                                             name:UITextFieldTextDidEndEditingNotification
                                               object:self.numberField];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.numberField resignFirstResponder];
}

-(void)formatCurrency {
    NSString *currentValue = self.numberField.text;
    long long cur = [currentValue longLongValue];
    NSNumber *curNum = @(cur);
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    [formatter setNumberStyle:NSNumberFormatterCurrencyStyle];

    self.numberField.text = [NSNumberFormatter localizedStringFromNumber:curNum
                                          numberStyle:NSNumberFormatterCurrencyStyle];
}