Question

Say I have a string which is £23.56 or $23.56 how can I convert it into -23.56 ?

I have this part

NSMutableString *strAmount = [NSMutableString stringWithString:txtAmount.text];
[strAmount replaceCharactersInRange: [strAmount rangeOfString: strCurrencySymbol]  withString:@""];

Answer 1

That looks like a good start. You could use rangeOfCharacterFromSet:instead of rangeOfString: though after creating a set of currency symbols. Your code could look like this:

NSMutableString *strAmount = [NSMutableString stringWithString:txtAmount.text];
NSCharacterSet *currencySet = [NSCharacterSet characterSetWithCharactersInString:@"$€£"];
[strAmount replaceCharactersInRange: [strAmount rangeOfCharacterFromSet:currencySet]  withString:@"-"];