A simple helper to trigger apple Storekit review only for users who actually uses the app

MyApp.swift

// when the user actullay uses your app (eg create something, or consults something important)
StoreReviewHelper.incrementEventCount()

// when the use may have the time to review the app (will not always show the review prompt, only if the event count is matched and Apple decides to show it)
StoreReviewHelper.checkAndAskForReview()

StoreReviewHelper.swift

import Foundation
import StoreKit

struct StoreReviewHelper {
    
    fileprivate static let STORE_REVIEW_EVENT_COUNT = "STORE_REVIEW_EVENT_COUNT"
    
    static func incrementEventCount() { // called from appdelegate didfinishLaunchingWithOptions:
        let eventCount = UserDefaults.standard.integer(forKey: STORE_REVIEW_EVENT_COUNT) + 1
        UserDefaults.standard.set(eventCount, forKey: STORE_REVIEW_EVENT_COUNT)
    }
    
    static func checkAndAskForReview() {
        if USER_IS_LOGGED_IN == false {
            return
        }

        let eventCount = UserDefaults.standard.integer(forKey: STORE_REVIEW_EVENT_COUNT)
        
        switch eventCount {
        case 10, 15:
            StoreReviewHelper().requestReview()
        case _ where eventCount % 20 == 0 :
            StoreReviewHelper().requestReview()
        default:
            log.debug("Event count is : \(eventCount)")
            break;
        }
        
    }
    fileprivate func requestReview() {
        if #available(iOS 10.3, *) {
            // this will not be shown everytime. Apple has some internal logic on how to show this.
            SKStoreReviewController.requestReview()
        }
    }
}