Question

I have an application in which I am implementing MKStorekit4 to have autorenewable purchases. I have successfully copied the code. When I am trying to call [MKStoreManager sharedManager]; on my appdelegate it will throws an error "cannot add nil observer" then it crashes.

This is my code

+ (MKStoreManager*)sharedManager
{
    @synchronized(self) {

        if (_sharedStoreManager == nil) {
#if TARGET_IPHONE_SIMULATOR
            NSLog(@"You are running in Simulator MKStoreKit runs only on devices");

#else
            _sharedStoreManager = [[self alloc] init];                  
            _sharedStoreManager.purchasableObjects = [[NSMutableArray alloc] init];
            [_sharedStoreManager requestProductData];                       
            _sharedStoreManager.storeObserver = [[MKStoreObserver alloc] init];

            [[SKPaymentQueue defaultQueue] 
addTransactionObserver:_sharedStoreManager.storeObserver];            
            [_sharedStoreManager startVerifyingSubscriptionReceipts];

#endif

        }
    }
    return _sharedStoreManager;
}

What am I doing wrong? Any help will be greatly appreciated.

Answer 1

This means that your _sharedStoreManager.storeObserver is nil.
But that’s really strange.

Try to NSLog("Observer %@",[_sharedStoreManager.storeObserver description]) after _sharedStoreManager.storeObserver = [[MKStoreObserver alloc] init]; to see if it has really allocated.