如何获取NSDecimal或NSDecimalNumber的无格式字符串表示形式？

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *formattedString = [formatter stringFromNumber:@(decimalValue)];
NSString *unformattedString = [formattedString stringByReplacingOccurrencesOfString:@"," withString:@""];

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *formattedString = [formatter stringFromNumber:decimalNumber];
NSString *unformattedString = [formattedString stringByReplacingOccurrencesOfString:@"," withString:@""];