getRootViewController returns nil when calling [Appirater rateApp] from a controller which is already modal

[erwanmace]

this will result in the rating view not being shown.

I suggest defining a new method:

• (void)rateAppFromController:(UIViewController*)

to let developer select specific controller.

[arashpayan]

I think the best plan here is to remove the option to display the app using SKStoreProductViewController. In iOS7 and onwards, you can't actually rate the app when displaying the app using the SKStoreProductViewController, so this only affects iOS 6 users.