Ask for AppStore Review

AppstoreReview.swift

//
//  AppstoreReview.swift
//  Colorizer
//
//  Created by ozgur on 2/11/20.
//  Copyright © 2020 Den. All rights reserved.
//

import Foundation
import StoreKit

class AppstoreReview
{
    static let processCompletedCountKey = "processCompletedCount"
    static let lastVersionPromptedForReviewKey = "lastVersionPromptedForReview"
    
    static func askReviewIfNecessary()
    {

        let askAfterThisTimesOfProcess = 3
        // If the count has not yet been stored, this will return 0
        var count = UserDefaults.standard.integer(forKey: processCompletedCountKey)
        count += 1
        UserDefaults.standard.set(count, forKey: processCompletedCountKey)
        
        print("Process completed \(count) time(s)")
        
        // Get the current bundle version for the app
        let infoDictionaryKey = kCFBundleVersionKey as String
        guard let currentVersion = Bundle.main.object(forInfoDictionaryKey: infoDictionaryKey) as? String
            else { fatalError("Expected to find a bundle version in the info dictionary") }
        
        let lastVersionPromptedForReview = UserDefaults.standard.string(forKey: lastVersionPromptedForReviewKey)
        
        // Has the process been completed several times and the user has not already been prompted for this version?
        if count >= askAfterThisTimesOfProcess
            && currentVersion != lastVersionPromptedForReview {
            let twoSecondsFromNow = DispatchTime.now() + 2.0
            
            
            DispatchQueue.main.asyncAfter(deadline: twoSecondsFromNow) {
                
                SKStoreReviewController.requestReview()
                UserDefaults.standard.set(currentVersion, forKey: self.lastVersionPromptedForReviewKey)
                
            }
        }
    }
}