Dismiss Modal App store on App close - ios

Question

I'm displaying the modal app store in my app, and everything is working as expected. However, I want to be able to dismiss the modal if it is present when the user closes the app. Is this possible?
This is how I have it set up at the moment:
if (param != nil && NSClassFromString(#"SKStoreProductViewController"))
{
NSDictionary *appParameters = #{ SKStoreProductParameterITunesItemIdentifier: param };
SKStoreProductViewController *productViewController = [[SKStoreProductViewController alloc] init];
[productViewController setDelegate:self];
[productViewController loadProductWithParameters:appParameters
completionBlock:^(BOOL result, NSError *error)
{
}];
[self presentViewController:productViewController
animated:YES
completion:^{
}];
}
And this completes the setup by allowing the user to dismiss the modal by clicking the close button.
- (void)productViewControllerDidFinish:(SKStoreProductViewController *)viewController
{
[viewController dismissViewControllerAnimated:YES completion:nil];
}
I was thinking I could change it so SKStoreProductViewController *productViewController is a member variable, and just call a function to dismiss it when the app deactivates, however this would not compile for anything under iOS 6, correct?

Answer 1

Just retain a reference to that view controller in your view controller:
#property (nonatomic, strong) UIViewController * skStoreProductViewController;
Then create the product view controller:
// Probably in -viewDidLoad ?
if (param != nil && NSClassFromString(#"SKStoreProductViewController"))
{
self.skStoreProuctViewController = [[SKStoreProductViewController alloc] init];
// etc...
}
Now, when the user backgrounds your app there is a notification for that event that you can listen for in your view controller. Set up a selector to run and use it to dismiss your view controller:
// Probably in -viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(shouldDismiss:) name:UIApplicationDidEnterBackgroundNotification object:nil];
Then ...
- (void)shouldDismiss:(NSNotification*)notification {
[self.skStoreProductViewController dismissViewControllerAnimated:YES completion:nil]
}