Convert NSSting to NSDecimalNumber based on locale - ios

Question

I want to convert a number which is input as NSString to NSDecimalNumber based on NSLocale.
for example
InputString => 110.50
Current Locale => en_FI
Expected output => 110.50
Actual output => 110
InputString => 110.50
Current Locale => en_US
Expected output => 110.50
Actual output => 110.50
InputString => 110,50
Current Locale => en_US
Expected output => 110.50
Actual output => 110
InputString => 110.50
Current Locale => en_US
Expected output => 110.50
Actual output => 110.50
I am using the following code to achieve this but its not working.
NSDecimalNumber *decimalNumber = [NSDecimalNumber decimalNumberWithString:self.amountTextField.text locale:[NSLocale currentLocale]];
As mentioned above in 1st and 3rd i am not the desired output. Any idea what i am doing wrong here.

Answer 1

The only numbers that do not have the expected output have a comma instead of a period and a period instead of a comma in the input. Try replacing that and see if it works as some locals use different decimal separators.

Answer 2

I propose you to specify NumberFormatters decimalSeparator yourself and in input string replace , and . with same character you used in decimalSeparator.
import Foundation
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
func cleanNumberString(with string: String) -> String {
let knownDecimalSeparators = [",", "."]
let localSeparator = formatter.decimalSeparator ?? "."
var cleanString = string;
for separator in knownDecimalSeparators {
cleanString = cleanString.replacingOccurrences(of: separator, with: localSeparator)
}
return cleanString
}
func number(with string: String) -> Double {
let cleanString = cleanNumberString(with: string)
let number = formatter.number(from: cleanString)
return number?.doubleValue ?? 0
}
let string1 = "14,4"
let string2 = "14.4"
let cleanString1 = cleanNumberString(with: string1)
let cleanString2 = cleanNumberString(with: string2)
let number1 = number(with: string1)
let number2 = number(with: string2)
Same in Objective-C
#interface CleanNumberFormatter ()
#property (nonatomic) NSNumberFormatter *formatter;
#end
#implementation CleanNumberFormatter
- (instancetype)init
{
self = [super init];
if (self) {
self.formatter = [NSNumberFormatter new];
self.formatter.numberStyle = NSNumberFormatterDecimalStyle;
}
return self;
}
- (NSString *)cleanNumberStringWithString:(NSString *)string
{
NSArray *knownDecimalSeparators = #[#",", #"."];
NSString *localSeparator = self.formatter.decimalSeparator ?: #",";
NSString *cleanString = [string copy];
for (NSString *separator in knownDecimalSeparators) {
cleanString = [cleanString stringByReplacingOccurrencesOfString:separator withString:localSeparator];
}
return cleanString;
}
- (double)numberWithString:(NSString *)string
{
NSString *cleanString = [self cleanNumberStringWithString:string];
double number = [self.formatter numberFromString:cleanString].doubleValue;
return number;
}
- (void)foo
{
NSString *string1 = #"14.4";
NSString *string2 = #"14,4";
NSString *cleanString1 = [self cleanNumberStringWithString:string1];
NSString *cleanString2 = [self cleanNumberStringWithString:string2];
double number1 = [self numberWithString:string1];
double number2 = [self numberWithString:string2];
}
#end