Show Localized price for In App Purchase

Question

I am using the following code in My ViewController, however when I call _priceFormatter it displays the price as (null)

 [buyButton setTitle:[NSString stringWithFormat:@"Upgrade for %@", [_priceFormatter stringFromNumber:product.price]] forState:UIControlStateNormal];

ViewController.m

{


    NSNumberFormatter * _priceFormatter;


}

ViewDidLoad

    [RageIAPHelper sharedInstance];

    _products = nil;

    [[RageIAPHelper sharedInstance] requestProductsWithCompletionHandler:^(BOOL success, NSArray *products) {
        if (success) {
            _products = products;

        }
    }];

    SKProduct * product = (SKProduct *) [_products objectAtIndex:0];


    ([[RageIAPHelper sharedInstance] productPurchased:product.productIdentifier]);

  _priceFormatter = [[NSNumberFormatter alloc] init];
    [_priceFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
    [_priceFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
    [_priceFormatter setLocale:product.priceLocale];

    [_priceFormatter stringFromNumber:product.price];

EDITED

_priceFormatter = [[NSNumberFormatter alloc] init];
[_priceFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[_priceFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[_priceFormatter setLocale:product.priceLocale];

NSString *priceString = [_priceFormatter stringFromNumber:product.price];

Button:

    UIButton *buyButton = [[UIButton alloc] initWithFrame:CGRectMake(-1, 370, 320, 60)];
[buyButton setTitle:[NSString stringWithFormat:@"Upgrade for %@", priceString] forState:UIControlStateNormal];
    [buyButton.titleLabel setFont:[UIFont boldSystemFontOfSize:13.0]];
    [buyButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [buyButton.titleLabel setShadowColor:[UIColor colorWithWhite:0.1 alpha:1.0]];
    [buyButton.titleLabel setShadowOffset:CGSizeMake(0, -1)];
    [buyButton addTarget:self action:@selector(buyButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    buyButton.tag = 0;
    [[self view] addSubview:buyButton];

Answer 1

You need to wait until the completion handler is called to process the products:

[RageIAPHelper sharedInstance];
_products = nil;

[[RageIAPHelper sharedInstance] requestProductsWithCompletionHandler:^(BOOL success, NSArray *products) {
    if (success) {
        _products = products;

        SKProduct * product = _products[0];

        [[RageIAPHelper sharedInstance] productPurchased:product.productIdentifier];

        _priceFormatter = [[NSNumberFormatter alloc] init];
        [_priceFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
        [_priceFormatter setLocale:product.priceLocale];
        NSString *price = [_priceFormatter stringFromNumber:product.price];
        someLabel.text = price;
    }
}];

And as you can see, you need to actually make use of the formatted number string. You were just throwing away the value.