CODEWITHSUNDEEP
iosswiftios8
NullHypothesis
NullHypothesis

Reputation: 4506

Decimals in Swift

I am writing a Swift app and am dealing with decimals in a database (stored in mysql as decimals, with 2 digits. Basically it's sales someone made each day, so generally anything from $0 to $1000, but not millions, and nothing insane in terms of trailing decimals, just always rounded to 2 decimal places).

Referencing this helped me out: How to properly format currency on ios

..But I wanted to just do a quick sanity check here and make sure this strategy is ok. i.e I would use NSDecimal or NSDecimalNumber (is there a preferred swift equivalent??)

What would you all recommend I do when dealing with currency in Swift? I'd like to use the locale-based currency symbol as well. I have a class called Sales that contains the amount in question. What do you recommend the datatype to be?

Apologies if I am coming off lazy, I actually have some ideas on what to do but feel a little overwhelmed at the "right" approach, especially in a locale-sensitive way, and wanted to check in here with you all.

Thanks so much!

Upvotes: 13

Views: 16345

Answers (2)

jtbandes
jtbandes

Reputation: 118651

Update for Swift 3: A Decimal type is now available with built-in support for operators like *, /, +, <, etc. When used in an Any context (passed to Objective-C), it's bridged to NSDecimalNumber.

Old answer:

NSDecimal is not really supported in Swift (it's a weird opaque pointer type), but NSDecimalNumber is — and as in Obj-C, it's the best thing to use for base-ten arithmetic (because it actually does its operations in base ten). NSLocale, NSNumberFormatter and friends all work too and should satisfy your localization needs.

Upvotes: 12

Jon Hull
Jon Hull

Reputation: 689

Swift 3 now has a Decimal (value) type which is bridged to NSDecimalNumber.

Upvotes: 3

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