iOSInAppPurchases/iOSInAppPurchases/StoreManager.m

/*
     File: StoreManager.m
 Abstract: Retrieves product information from the App Store using SKRequestDelegate, SKProductsRequestDelegate,SKProductsResponse, and
           SKProductsRequest. Notifies its observer with a list of products available for sale along with a list of invalid product
           identifiers. Logs an error message if the product request failed.
 
  Version: 1.0
 
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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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*/
 
#import "StoreManager.h"
 
NSString * const IAPProductRequestNotification = @"IAPProductRequestNotification";
 
@interface StoreManager()<SKRequestDelegate, SKProductsRequestDelegate>
@end
 
@implementation StoreManager
 
+ (StoreManager *)sharedInstance
{
    static dispatch_once_t onceToken;
    static StoreManager * storeManagerSharedInstance;
    
    dispatch_once(&onceToken, ^{
        storeManagerSharedInstance = [[StoreManager alloc] init];
    });
    return storeManagerSharedInstance;
}
 
 
- (id)init
{
    self = [super init];
    if (self != nil)
    {
        _availableProducts = [[NSMutableArray alloc] initWithCapacity:0];
        _invalidProductIds = [[NSMutableArray alloc] initWithCapacity:0];
    }
    return self;
}
 
 
#pragma mark -
#pragma mark Request information
 
// Fetch information about your products from the App Store
-(void)fetchProductInformationForIds:(NSArray *)productIds
{
    // Create a product request object and initialize it with our product identifiers
    SKProductsRequest *request = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithArray:productIds]];
    request.delegate = self;
    
    // Send the request to the App Store
    [request start];
}
 
 
#pragma mark -
#pragma mark - SKProductsRequestDelegate
 
// Used to get the App Store's response to your request and notifies your observer
- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    // The products array contains products whose identifiers have been recognized by the App Store.
    // As such, they can be purchased. Add them to the availableProducts array.
    if ([response.products count] > 0)
    {
        self.availableProducts = [NSMutableArray arrayWithArray:response.products];
        self.status = IAPProductsFound;
        [[NSNotificationCenter defaultCenter] postNotificationName:IAPProductRequestNotification object:self];
    }
    
    // The invalidProductIdentifiers array contains all product identifiers not recognized by the App Store.
    // Add them to the invalidProducts array.
    if ([response.invalidProductIdentifiers count] > 0)
    {
        self.invalidProductIds = [NSMutableArray arrayWithArray:response.invalidProductIdentifiers];
        self.status = IAPIdentifiersNotFound;
        [[NSNotificationCenter defaultCenter] postNotificationName:IAPProductRequestNotification object:self];
    }
}
 
 
#pragma mark -
#pragma mark SKRequestDelegate method
 
// Called when the product request failed.
- (void)request:(SKRequest *)request didFailWithError:(NSError *)error
{
    // Prints the cause of the product request failure
    NSLog(@"Product Request Status: %@",[error localizedDescription]);
}
 
#pragma mark -
#pragma mark Helper method
 
// Return the product's title matching a given product identifier
-(NSString *)titleMatchingProductIdentifier:(NSString *)identifier
{
    NSString *productTitle = nil;
    // Iterate through availableProducts to find the product whose productIdentifier
    // property matches identifier, return its localized title when found
    for (SKProduct *product in self.availableProducts)
    {
        if ([product.productIdentifier isEqualToString:identifier])
        {
            productTitle = product.localizedTitle;
        }
    }
    return productTitle;
}
 
@end