Is there a simple way to format currency into string in iOS?

问题

I need a way to format the price from NSNumber into a string like this: "USD 0.99", not "$ 0.99".

My game uses custom fonts, and they could not have the symbols for all the available App Store currencies like GBP. So I think it's better to roll-back to string representation of currency.

The method used should be absolutely OK for any currency that App Store supports.

回答1:

If you want it localized (ie the currency on the correct side of the price) it is a bit of a hassle.

NSDecimalNumber *price = [NSDecimalNumber decimalNumberWithString:@"1.99"];
NSLocale *priceLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"de_DE"] autorelease]; // get the locale from your SKProduct

NSNumberFormatter *currencyFormatter = [[[NSNumberFormatter alloc] init] autorelease];
[currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[currencyFormatter setLocale:priceLocale];
NSString *currencyString = [currencyFormatter internationalCurrencySymbol]; // EUR, GBP, USD...
NSString *format = [currencyFormatter positiveFormat];
format = [format stringByReplacingOccurrencesOfString:@"¤" withString:currencyString];
    // ¤ is a placeholder for the currency symbol
[currencyFormatter setPositiveFormat:format];

NSString *formattedCurrency = [currencyFormatter stringFromNumber:price];

You have to use the locale you get from the SKProduct. Don't use [NSLocale currentLocale]!

回答2:

The – productsRequest:didReceiveResponse: method gives you back a list of SKProducts.

Each product contains a property priceLocale which contains the local currency of the product for the current user.

You could use the following sample code (apple's) to format it:

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[numberFormatter setLocale:product.priceLocale];
NSString *formattedString = [numberFormatter stringFromNumber:product.price];

Good luck!

回答3:

The Swift Example:

var currencyFormatter = NSNumberFormatter()
currencyFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
currencyFormatter.locale = priceLocale //SKProduct->priceLocale
var currencyString = currencyFormatter.internationalCurrencySymbol
var format = currencyFormatter.positiveFormat
format = format.stringByReplacingOccurrencesOfString("¤", withString: currencyString)
currencyFormatter.positiveFormat = format

var formattedCurrency = currencyFormatter.stringFromNumber(price) //SKProduct->price

println("formattedCurrency: \(formattedCurrency)")//formattedCurrency: 0,89 EUR

回答4:

Nice example I found here http://bendodson.com/weblog/2014/12/10/skproduct-localized-price-in-swift/

import StoreKit

extension SKProduct {

    @objc func localizedPrice() -> String {
        let formatter = NSNumberFormatter()
        formatter.numberStyle = .CurrencyStyle
        formatter.locale = self.priceLocale
        return formatter.stringFromNumber(self.price)!
    }
}

回答5:

use formatter in this way or you can also customize it

NSNumberFormatter *numberFormatter = [[[NSNumberFormatter alloc] init] autorelease];
[numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];

or like this

[formatter setFormat:@"USD ###.00"];

i think you can check the currency for the country and store that in string and give that to the formatter.

回答6:

The easiest way to achieve this would be to use the NSNumberFormatter class to format the NSNumber value as required.

Whilst the methods are too numerous to mention, this provides a wide variety of output formatting capabilities including the setInternationalCurrencySymbol: method that should be of particular interest.

回答7:

SKProduct price is a NSDecimalNumber object, so one way you could do this would be to extend the NSDecimalNumber class. Here's my Swift code for this:

extension NSDecimalNumber {
    func asCurrency(locale:NSLocale) -> String? {
        var numberFormatter = NSNumberFormatter()
        numberFormatter.formatterBehavior = NSNumberFormatterBehavior.Behavior10_4
        numberFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
        numberFormatter.locale = locale
        return numberFormatter.stringFromNumber(self)
    }
}

in Objective-C it would look like this:

@interface NSDecimalNumber (CurrencyExtension)

- (NSString*) asCurrency: (NSLocale *)locale;

@end

@implementation NSDecimalNumber (DellExtensions)

- (NSString*) asCurrency: (NSLocale *)locale {
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
    [numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
    [numberFormatter setLocale:product.priceLocale];
    return [numberFormatter stringFromNumber:product.price];
}

@end

来源：https://stackoverflow.com/questions/5105227/is-there-a-simple-way-to-format-currency-into-string-in-ios

标签

iphone

objective-c

ios

app-store

currency