add app_review

packages/app_review/ios/Classes/AppReviewPlugin.h

@@ -0,0 +1,4 @@
+#import <Flutter/Flutter.h>
+
+@interface AppReviewPlugin : NSObject<FlutterPlugin>
+@end

packages/app_review/ios/Classes/AppReviewPlugin.m

@@ -0,0 +1,8 @@
+#import "AppReviewPlugin.h"
+#import <app_review/app_review-Swift.h>
+
+@implementation AppReviewPlugin
++ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
+  [SwiftAppReviewPlugin registerWithRegistrar:registrar];
+}
+@end

packages/app_review/ios/Classes/SwiftAppReviewPlugin.swift

@@ -0,0 +1,39 @@
+import Flutter
+import UIKit
+import StoreKit
+
+public class SwiftAppReviewPlugin: NSObject, FlutterPlugin {
+  public static func register(with registrar: FlutterPluginRegistrar) {
+    let channel = FlutterMethodChannel(name: "app_review", binaryMessenger: registrar.messenger())
+    let instance = SwiftAppReviewPlugin()
+    registrar.addMethodCallDelegate(instance, channel: channel)
+  }
+
+  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+    var appID = "com.apple.appstore" //Your App ID on App Store
+    if let bundleIdentifier = Bundle.main.bundleIdentifier {
+        appID = bundleIdentifier
+    }
+
+    switch (call.method) {
+        case "requestReview":
+          //App Store Review
+          if #available(iOS 10.3, *) {
+              SKStoreReviewController.requestReview() // Requesting alert view for getting rating from the user.
+            result("Later than iOS 10.3 the App will Request the App Review, Users can turn this off in settings for all apps, Apple will manage when to request the review from the user. In Debug it will always show. Requesting review for: " + appID)
+          } else {
+            // Fallback on earlier versions
+            result("Prior to iOS 10.3 App Review from App is not available. You should go to Store Page of App: " + appID + ". If the app is not published the app will not be found.")
+          }
+        case "isRequestReviewAvailable":
+          if #available(iOS 10.3, *) {
+            result("1")
+          } else {
+            result("0")
+          }
+        default:
+          result(FlutterMethodNotImplemented)
+    }
+  }
+
+}