Question

I’ve got a singleton (StoreManager) to help me manage my In-App Purchases, and it has a property called productArray, which is set like so:

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    self.productArray = response.products;
}

In my store’s view controller, I have this code:

-(void)setupPrices 
{
    if ([[StoreManager sharedStoreManager] productArray]) {
        [productArray objectAtIndex:2]...
}

It was working fine for a while, but now I get SIGABRT: index 2 beyond bounds of empty array, so clearly my if statement has passed as true, even though the method that sets the value hasn’t been called yet. I thought this was weird so I tried some code and it seems if I do

NSArray *array;
NSLog (@"%u", array.count);

I get bad access and if I do

NSArray *array;
if (array)
    NSLog(@"Array is not nil");

The statement passes. I’m sure I’m missing something here. How do I check if my array has been set?

Answer 1

count is a method of NSArray, not a property.

NSLog(@"%d", [array count]);

Check if the array’s count is atleast 3 before you access the object at index 2.