objective-c – 将货币格式化字符串转换为普通字符串

我的代码是这样的……

-(NSString *)removeCurrency:(NSString *)str{


    NSnumberFormatter *_currencyFormatter = [[NSnumberFormatter alloc] init];
    [_currencyFormatter setnumberStyle:NSnumberFormatterCurrencyStyle];
    [_currencyFormatter setNegativeFormat:@"-¤#,##0.00"];

    NSLog(@"\n With Currency : %@",str);
    NSLog(@"\n Without Currency : %@",[_currencyFormatter numberFromString:str]);

    return [NSString StringWithFormat:@"%@",[_currencyFormatter numberFromString:str]]; 
}

但问题是,当我输入字符串Rs 0.009它返回我不同的值,但与另一个数字,它工作完美…