Instance respond to selector always return NO. But why?

Question

This statement is always false. Even on iOS 10.3 device. I don't know why.

if ([NSClassFromString(@"SKStoreReviewController") instancesRespondToSelector:@selector(requestReview)]) {
    [SKStoreReviewController requestReview];
}

PS If I remove if statement there is a review dialog on my screen.

Answer 1

requestReview is a class method, not an instance method. Use respondsToSelector on the class.

if ([NSClassFromString(@"SKStoreReviewController") respondsToSelector:@selector(requestReview)]) {
    [SKStoreReviewController requestReview];
}