Restore in app purchase method in my iOS App

Question

These are my first steps on implementing IAP, so be easy on me. I have to implement the restore app button on my app and I don't know where to start/modify

This is my IAP class

#import "IAPHelper.h"

@implementation IAPHelper
@synthesize productIdentifiers = _productIdentifiers;
@synthesize products = _products;
@synthesize purchasedProducts = _purchasedProducts;
@synthesize request = _request;

- (id)initWithProductIdentifiers:(NSSet *)productIdentifiers {
    if ((self = [super init])) {

        // Store product identifiers
        _productIdentifiers = [productIdentifiers retain];

        // Check for previously purchased products
        NSMutableSet * purchasedProducts = [NSMutableSet set];
        for (NSString * productIdentifier in _productIdentifiers) {
            BOOL productPurchased = [[NSUserDefaults standardUserDefaults] boolForKey:productIdentifier];
            if (productPurchased) {
                [purchasedProducts addObject:productIdentifier];
                NSLog(@"Previously purchased: %@", productIdentifier);
            }
            NSLog(@"Not purchased: %@", productIdentifier);
        }
        self.purchasedProducts = purchasedProducts;

    }
    return self;
}

- (void)requestProducts {

    self.request = [[[SKProductsRequest alloc] initWithProductIdentifiers:_productIdentifiers] autorelease];

    [[SKPaymentQueue defaultQueue] addTransactionObserver:self];

    _request.delegate = self;
    [_request start];
}

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {

    NSLog(@"Received products results..."); 
    NSLog(@"Invalid ...%d", [response.invalidProductIdentifiers count]); 

    if([response.invalidProductIdentifiers count]>0)
    {
        return;
    }

    self.products = response.products;
    self.request = nil;

    SKProduct * proUpgradeProduct = [self.products count] == 1 ? [[self.products objectAtIndex:0] retain] : nil;
    if (proUpgradeProduct)
    {
        NSLog(@"Product title: %@" , proUpgradeProduct.localizedTitle);
        NSLog(@"Product description: %@" , proUpgradeProduct.localizedDescription);
        NSLog(@"Product price: %@" , proUpgradeProduct.price);
        NSLog(@"Product id: %@" , proUpgradeProduct.productIdentifier);
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:kProductsLoadedNotification object:_products];    
}

- (void)recordTransaction:(SKPaymentTransaction *)transaction {    
    // TODO: Record the transaction on the server side...    
}

- (void)provideContent:(NSString *)productIdentifier {

    NSLog(@"Toggling flag for: %@", productIdentifier);

    [[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:productIdentifier];
    [[NSUserDefaults standardUserDefaults] synchronize];
    [_purchasedProducts addObject:productIdentifier];

    [[NSNotificationCenter defaultCenter] postNotificationName:kProductPurchasedNotification object:productIdentifier];

}

- (void)completeTransaction:(SKPaymentTransaction *)transaction {

    NSLog(@"completeTransaction...");

    [self recordTransaction: transaction];
    [self provideContent: transaction.payment.productIdentifier];
    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

}

- (void)restoreTransaction:(SKPaymentTransaction *)transaction {

    NSLog(@"restoreTransaction...");

    [self recordTransaction: transaction];
    [self provideContent: transaction.originalTransaction.payment.productIdentifier];
    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

}


- (void)finishTransaction:(SKPaymentTransaction *)transaction wasSuccessful:(BOOL)wasSuccessful
{
    // remove the transaction from the payment queue.
    [[SKPaymentQueue defaultQueue] finishTransaction:transaction];

    NSDictionary *userInfo = [NSDictionary dictionaryWithObjectsAndKeys:transaction, @"transaction" , nil];
    if (wasSuccessful)
    {
        // send out a notification that we’ve finished the transaction
        [[NSNotificationCenter defaultCenter] postNotificationName:kInAppPurchaseManagerTransactionSucceededNotification object:self userInfo:userInfo];
    }
    else
    {
        // send out a notification for the failed transaction
        [[NSNotificationCenter defaultCenter] postNotificationName:kInAppPurchaseManagerTransactionFailedNotification object:self userInfo:userInfo];
    }
}

- (void)failedTransaction:(SKPaymentTransaction *)transaction {

    if (transaction.error.code != SKErrorPaymentCancelled)
    {
        // error!
        [self finishTransaction:transaction wasSuccessful:NO];
    }
    else
    {
        // this is fine, the user just cancelled, so don’t notify
        [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
    }
}

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
    for (SKPaymentTransaction *transaction in transactions)
    {
        switch (transaction.transactionState)
        {
            case SKPaymentTransactionStatePurchased:
                [self completeTransaction:transaction];
                break;
            case SKPaymentTransactionStateFailed:
                [self failedTransaction:transaction];
                break;
            case SKPaymentTransactionStateRestored:
                [self restoreTransaction:transaction];
            default:
                break;
        }
    }
}

- (void)buyProductIdentifier:(NSString *)productIdentifier {

    NSLog(@"Buying %@...", productIdentifier);

    SKPayment *payment = [SKPayment paymentWithProductIdentifier:productIdentifier];
    [[SKPaymentQueue defaultQueue] addPayment:payment];

}

- (void)dealloc
{
    [_productIdentifiers release];
    _productIdentifiers = nil;
    [_products release];
    _products = nil;
    [_purchasedProducts release];
    _purchasedProducts = nil;
    [_request release];
    _request = nil;
    [super dealloc];
}

@end

I have been reading some things, but in the part of 'updatedTransactions' I have some issues on adding the SKPaymentRestore.

Could someone give me some advice? thanks for reading/helping!

Answer 1

Use RMStore for In app purchase.A lightweight iOS library for In-App Purchases.RMStore adds blocks and notifications to StoreKit, plus receipt verification, content downloads and transaction persistence. All in one class without external dependencies. Add this in Restore Button. Restore transactions

     [[RMStore defaultStore] restoreTransactionsOnSuccess:^{
    NSLog(@"Transactions restored");
    } failure:^(NSError *error) {
      NSLog(@"Something went wrong");
     }];

Answer 2

Just add this code on your restore button click

[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];