#1365 (in-app ratings dialog)

clients/ios/Classes/FeedsViewController.swift

@@ -7,9 +7,51 @@
 //
 
 import UIKit
+import StoreKit
 
 ///Sidebar listing all of the feeds.
 class FeedsViewController: FeedsObjCViewController {
+    struct Keys {
+        static let reviewDate = "datePromptedForReview"
+        static let reviewVersion = "versionPromptedForReview"
+    }
+    
+    var appearCount = 0
+    
+    lazy var appVersion: String = {
+        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")
+        }
+        
+        return currentVersion
+    }()
+    
+    var datePromptedForReview: Date {
+        get {
+            guard let date = UserDefaults.standard.object(forKey: Keys.reviewDate) as? Date else {
+                let date = Date()
+                UserDefaults.standard.set(date, forKey: Keys.reviewDate)
+                return date
+            }
+            
+            return date
+        }
+        set {
+            UserDefaults.standard.set(newValue, forKey: Keys.reviewDate)
+        }
+    }
+    
+    var versionPromptedForReview: String {
+        get {
+            return UserDefaults.standard.string(forKey: Keys.reviewVersion) ?? ""
+        }
+        set {
+            UserDefaults.standard.set(newValue, forKey: Keys.reviewVersion)
+        }
+    }
+    
     var loadWorkItem: DispatchWorkItem?
     
     @objc func loadNotificationStory() {
@@ -26,4 +68,26 @@ class FeedsViewController: FeedsObjCViewController {
         loadWorkItem = workItem
         DispatchQueue.main.asyncAfter(deadline: .now() + (isOffline ? .seconds(1) : .milliseconds(100)), execute: workItem)
     }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        
+        appearCount += 1
+        
+        let month: TimeInterval = 60 * 60 * 24 * 30
+        let promptedDate = datePromptedForReview
+        let currentVersion = appVersion
+        let promptedVersion = versionPromptedForReview
+        
+        // We only get a few prompts per year, so only ask for a review if gone back to the Feeds list several times, it's been at least a month since the last prompt, and it's a different version.
+        if appearCount >= 5, -promptedDate.timeIntervalSinceNow > month, currentVersion != promptedVersion, let scene = view.window?.windowScene {
+            DispatchQueue.main.asyncAfter(deadline: .now() + 2) { [navigationController] in
+                if navigationController?.topViewController is FeedsViewController {
+                    SKStoreReviewController.requestReview(in: scene)
+                    self.datePromptedForReview = Date()
+                    self.versionPromptedForReview = currentVersion
+                }
+            }
+        }
+    }
 }