特定頻度でユーザのレビューを要求する

import StoreKit

func askUserToRate() {
    var gamePlayed = UserDefaults.standard.integer(forKey: "gamePlayed")
    gamePlayed += 1
    UserDefaults.standard.set(gamePlayed, forKey: "gamePlayed")
    if gamePlayed % 10 == 0 {
        SKStoreReviewController.requestReview()
    }
}