In the ranking of applications for users with an OS version below iOS 11

Question

How can users of iOS apps below iOS 11 rate the app?

Should I write conditional code something like this:

if (iOS11) {
    [SKStoreReviewController requestReview];
} else {
    //show custom review prompt and redirect to app store
}

Will Apple allow this or reject the application? If Apple does not allow this, then what should other users do? Thanks in advance.

Answer 1

Working and tested solution

if (NSClassFromString(@"SKStoreReviewController")) {

            [SKStoreReviewController requestReview];
        }
        else{
             //redirect user to AppStore
        }