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How to access the price of a product in SKPayment?

I am having an In-App-Purchase for an iPhone app.

I want to display the price in the users local currency in a UILabel. For this I need the price & currency in a variable.

How can I get the price including the currency using SKPayment? (If SKPayment is correct for this use.)

I'm instantiating the product using:

SKPayment *payment = [SKPayment paymentWithProductIdentifier:@"Identifier"];

Thank you all in advance for your feedback!

like image 467
favo Avatar asked May 24 '10 01:05

favo


4 Answers

There's a problem with just using NSLocaleCurrencySymbol + price.stringValue: it doesn't handle the peculiarities of different locales, eg. whether they put the currency symbol in front or not. Norway, Denmark, Sweden and Switzerland all put their currency after, eg. 17.00Kr. Also, most(?) European countries use ',' instead of '.' for decimals, eg. "2,99 €" rather than "€2.99".

A better plan is to use NSNumberFormatter. The "priceLocale" that the SKProduct returned, as Ed demonstrated, is the key. It gives NSNumberFormatter the smarts to format a price correctly.

You can also make this a lot easier by adding a new property to SKProduct using an Objective-C category. Add the following two files to your project:


SKProduct+priceAsString.h:

#import <Foundation/Foundation.h>
#import <StoreKit/StoreKit.h>

@interface SKProduct (priceAsString)
@property (nonatomic, readonly) NSString *priceAsString;
@end

SKProduct+priceAsString.m:

#import "SKProduct+priceAsString.h"

@implementation SKProduct (priceAsString)

- (NSString *) priceAsString
{
  NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
  [formatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
  [formatter setNumberStyle:NSNumberFormatterCurrencyStyle];
  [formatter setLocale:[self priceLocale]];

  NSString *str = [formatter stringFromNumber:[self price]];
  [formatter release];
  return str;
}

@end

Then, #import "SKProduct+priceAsString.h" in your code, and you should just be able to use product.priceAsString in code.

like image 104
2 revs, 2 users 99% Avatar answered Oct 02 '22 20:10

2 revs, 2 users 99%


The correct way to determine any of that information is to use an SKProduct object, retrieved from the SKProductResponse object returned to the delegate after a call to - (void) start on an initialized SKProductsRequest. Something like this:

SKProductsRequest *req = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:@"Identifier"]];
req.delegate = self;
[req start];

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse: (SKProductsResponse *)response {
    [request autorelease];
    if (response.products.count) {
        SKProduct *product = [response.products objectAtIndex:0];
        NSLocale *priceLocale = product.priceLocale;
        NSDecimalNumber *price = product.price;
        NSString *description = product.localizedDescription;
    }
}
like image 30
Ed Marty Avatar answered Oct 02 '22 20:10

Ed Marty


Here is the solution for Swift 3.0

extension SKProduct {
  func priceAsString() -> String {
    let formatter = NumberFormatter()
    formatter.formatterBehavior = .behavior10_4
    formatter.numberStyle = .currency
    formatter.locale = self.priceLocale
    return formatter.string(from: self.price)! as String
  }
}
like image 41
Reza Shirazian Avatar answered Oct 02 '22 20:10

Reza Shirazian


Here's the Swift version of the above answer using an extension:

extension SKProduct {
  func priceAsString() -> String {
    let formatter = NumberFormatter()
    formatter.formatterBehavior = .behavior10_4
    formatter.numberStyle = .currency
    formatter.locale = self.priceLocale
    return formatter.string(from: self.price)! as String
  }
}
like image 45
rebello95 Avatar answered Oct 02 '22 18:10

rebello95