Added iOS example for add-to-app Pigeon (#722)

add_to_app/books/ios_books/IosBooks/AppDelegate.swift

@@ -0,0 +1,37 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import Flutter
+import UIKit
+
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+  lazy var engine: FlutterEngine = {
+    let result = FlutterEngine.init(name: "Books")
+    // This could be `run` earlier in the app to avoid the overhead of doing it the first time the
+    // engine is needed.
+    result.run()
+    return result
+  }()
+
+  func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    return true
+  }
+
+  func application(
+    _ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession,
+    options: UIScene.ConnectionOptions
+  ) -> UISceneConfiguration {
+    return UISceneConfiguration(
+      name: "Default Configuration", sessionRole: connectingSceneSession.role)
+  }
+
+  func application(
+    _ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>
+  ) {
+  }
+}

add_to_app/books/ios_books/IosBooks/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

add_to_app/books/ios_books/IosBooks/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

add_to_app/books/ios_books/IosBooks/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

add_to_app/books/ios_books/IosBooks/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

add_to_app/books/ios_books/IosBooks/Base.lproj/Main.storyboard

@@ -0,0 +1,119 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17506" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="b8i-Fj-lA1">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17505"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Navigation Controller-->
+        <scene sceneID="srE-pH-qZb">
+            <objects>
+                <navigationController id="b8i-Fj-lA1" sceneMemberID="viewController">
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="wTo-xw-305">
+                        <rect key="frame" x="0.0" y="44" width="414" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                        <color key="barTintColor" red="0.38431372549019605" green="0.0" blue="0.93333333333333335" alpha="0.84705882352941175" colorSpace="calibratedRGB"/>
+                        <textAttributes key="titleTextAttributes">
+                            <color key="textColor" systemColor="systemGray6Color"/>
+                        </textAttributes>
+                    </navigationBar>
+                    <connections>
+                        <segue destination="Xp0-05-6gn" kind="relationship" relationship="rootViewController" id="yik-Yg-HdC"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="NW2-DP-JZL" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-1328" y="-17"/>
+        </scene>
+        <!--Books-->
+        <scene sceneID="Ywb-fB-wBN">
+            <objects>
+                <tableViewController title="Books" id="Xp0-05-6gn" customClass="ViewController" customModule="IosBooks" customModuleProvider="target" sceneMemberID="viewController">
+                    <tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" allowsSelection="NO" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" id="uCy-ec-yGR">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                        <prototypes>
+                            <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="BookCell" rowHeight="190" id="SBb-uI-gbV" customClass="BookCell" customModule="IosBooks" customModuleProvider="target">
+                                <rect key="frame" x="0.0" y="28" width="414" height="190"/>
+                                <autoresizingMask key="autoresizingMask"/>
+                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="SBb-uI-gbV" id="C7V-w9-p66">
+                                    <rect key="frame" x="0.0" y="0.0" width="414" height="190"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                    <subviews>
+                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Book Title" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7KN-aJ-DT5">
+                                            <rect key="frame" x="20" y="11" width="374" height="29"/>
+                                            <fontDescription key="fontDescription" type="boldSystem" pointSize="24"/>
+                                            <nil key="textColor"/>
+                                            <nil key="highlightedColor"/>
+                                        </label>
+                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Uh5-nw-lRt">
+                                            <rect key="frame" x="20" y="48" width="374" height="41"/>
+                                            <string key="text">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc velit orci, varius tincidunt nisi ac, porta porta ipsum. Pellentesque feugiat consequat massa, facilisis euismod turpis aliquam at. Suspendisse mollis volutpat lacinia. Aenean tristique porttitor purus, eu porta sem tempor sit amet. </string>
+                                            <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                            <nil key="textColor"/>
+                                            <nil key="highlightedColor"/>
+                                        </label>
+                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="By: Foobar F.  Foobar" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="76v-Ju-4Wc">
+                                            <rect key="frame" x="20" y="111" width="374" height="21"/>
+                                            <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                            <nil key="textColor"/>
+                                            <nil key="highlightedColor"/>
+                                        </label>
+                                        <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="b0u-fM-VM6">
+                                            <rect key="frame" x="350" y="140" width="44" height="44"/>
+                                            <constraints>
+                                                <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="44" id="Vf7-pJ-LZ3"/>
+                                                <constraint firstAttribute="height" constant="44" id="cfM-g4-ptv"/>
+                                            </constraints>
+                                            <state key="normal" title="Edit"/>
+                                        </button>
+                                    </subviews>
+                                    <constraints>
+                                        <constraint firstAttribute="bottom" secondItem="b0u-fM-VM6" secondAttribute="bottom" constant="6" id="BPN-jO-sVu"/>
+                                        <constraint firstItem="7KN-aJ-DT5" firstAttribute="leading" secondItem="C7V-w9-p66" secondAttribute="leadingMargin" id="DsW-Gq-sjE"/>
+                                        <constraint firstItem="7KN-aJ-DT5" firstAttribute="trailing" secondItem="C7V-w9-p66" secondAttribute="trailingMargin" id="IVX-uA-An6"/>
+                                        <constraint firstItem="7KN-aJ-DT5" firstAttribute="top" secondItem="C7V-w9-p66" secondAttribute="topMargin" id="Iip-4a-2kS"/>
+                                        <constraint firstItem="76v-Ju-4Wc" firstAttribute="leading" secondItem="C7V-w9-p66" secondAttribute="leadingMargin" id="ZbD-YJ-kaV"/>
+                                        <constraint firstItem="76v-Ju-4Wc" firstAttribute="top" secondItem="Uh5-nw-lRt" secondAttribute="bottom" constant="22" id="cyp-xR-7If"/>
+                                        <constraint firstItem="b0u-fM-VM6" firstAttribute="trailing" secondItem="C7V-w9-p66" secondAttribute="trailingMargin" id="gSP-0I-VmO"/>
+                                        <constraint firstItem="b0u-fM-VM6" firstAttribute="leading" relation="greaterThanOrEqual" secondItem="C7V-w9-p66" secondAttribute="leadingMargin" id="gzq-Ig-PZI"/>
+                                        <constraint firstItem="b0u-fM-VM6" firstAttribute="top" secondItem="76v-Ju-4Wc" secondAttribute="bottom" constant="8" symbolic="YES" id="lCb-GM-BvA"/>
+                                        <constraint firstItem="Uh5-nw-lRt" firstAttribute="trailing" secondItem="C7V-w9-p66" secondAttribute="trailingMargin" id="p6I-sS-CN3"/>
+                                        <constraint firstItem="Uh5-nw-lRt" firstAttribute="leading" secondItem="C7V-w9-p66" secondAttribute="leadingMargin" id="qcT-uN-mqo"/>
+                                        <constraint firstItem="Uh5-nw-lRt" firstAttribute="top" secondItem="7KN-aJ-DT5" secondAttribute="bottom" constant="8" symbolic="YES" id="r2u-eT-RhX"/>
+                                        <constraint firstItem="76v-Ju-4Wc" firstAttribute="trailing" secondItem="C7V-w9-p66" secondAttribute="trailingMargin" id="zc4-dZ-JcM"/>
+                                    </constraints>
+                                </tableViewCellContentView>
+                                <connections>
+                                    <outlet property="byLine" destination="76v-Ju-4Wc" id="9Ky-Yc-aXU"/>
+                                    <outlet property="editButton" destination="b0u-fM-VM6" id="q99-MH-ThV"/>
+                                    <outlet property="subtitle" destination="Uh5-nw-lRt" id="UGS-IB-WV1"/>
+                                    <outlet property="title" destination="7KN-aJ-DT5" id="a5N-rW-azA"/>
+                                </connections>
+                            </tableViewCell>
+                        </prototypes>
+                        <sections/>
+                        <connections>
+                            <outlet property="dataSource" destination="Xp0-05-6gn" id="nso-Wx-y17"/>
+                            <outlet property="delegate" destination="Xp0-05-6gn" id="Gk5-ND-hmv"/>
+                        </connections>
+                    </tableView>
+                    <navigationItem key="navigationItem" id="Mr1-af-Ogz"/>
+                </tableViewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="17x-S3-agc" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-371.01449275362324" y="-17.410714285714285"/>
+        </scene>
+    </scenes>
+    <resources>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+        <systemColor name="systemGray6Color">
+            <color red="0.94901960784313721" green="0.94901960784313721" blue="0.96862745098039216" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        </systemColor>
+    </resources>
+</document>

add_to_app/books/ios_books/IosBooks/BookCell.swift

@@ -0,0 +1,8 @@
+import UIKit
+
+class BookCell: UITableViewCell {
+  @IBOutlet weak var title: UILabel!
+  @IBOutlet weak var subtitle: UILabel!
+  @IBOutlet weak var byLine: UILabel!
+  @IBOutlet weak var editButton: UIButton!
+}

add_to_app/books/ios_books/IosBooks/Info.plist

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

add_to_app/books/ios_books/IosBooks/IosBooks-Bridging-Header.h

@@ -0,0 +1,5 @@
+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//
+
+#import "api.h"

add_to_app/books/ios_books/IosBooks/SceneDelegate.swift

@@ -0,0 +1,32 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import UIKit
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+
+  var window: UIWindow?
+
+  func scene(
+    _ scene: UIScene, willConnectTo session: UISceneSession,
+    options connectionOptions: UIScene.ConnectionOptions
+  ) {
+    guard let _ = (scene as? UIWindowScene) else { return }
+  }
+
+  func sceneDidDisconnect(_ scene: UIScene) {
+  }
+
+  func sceneDidBecomeActive(_ scene: UIScene) {
+  }
+
+  func sceneWillResignActive(_ scene: UIScene) {
+  }
+
+  func sceneWillEnterForeground(_ scene: UIScene) {
+  }
+
+  func sceneDidEnterBackground(_ scene: UIScene) {
+  }
+}

add_to_app/books/ios_books/IosBooks/ViewController.swift

@@ -0,0 +1,131 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import Flutter
+import UIKit
+
+class ViewController: UITableViewController, BKHostBookApi {
+  private var books: [BKBook] = []
+  private var api: BKFlutterBookApi!
+  private var editingIndex: Int = -1
+
+  override func viewDidLoad() {
+    super.viewDidLoad()
+    self.navigationItem.title = "Books"
+    let appDelegate = UIApplication.shared.delegate as! AppDelegate
+    BKHostBookApiSetup(appDelegate.engine.binaryMessenger, self)
+    api = BKFlutterBookApi.init(binaryMessenger: appDelegate.engine.binaryMessenger)
+    if let url = URL(
+      string: "https://www.googleapis.com/books/v1/volumes?q=greenwood+tulsa&maxResults=15")
+    {
+      self.loadBooks(url: url) { (newBooks) in
+        if let newBooks = newBooks {
+          self.books = newBooks
+          self.tableView.reloadData()
+        }
+      }
+    }
+  }
+
+  /**
+   Loads a JSON file from the supplied URL, parses it and calls the callback with the array of
+   parsed books on the main thread.
+   */
+  func loadBooks(url: URL, completion: @escaping ([BKBook]?) -> Void) {
+    URLSession.shared.dataTask(with: url) { data, response, error in
+      if let data = data {
+        do {
+          if let json = try JSONSerialization.jsonObject(with: data, options: [])
+            as? [String: Any]
+          {
+            var newBooks: [BKBook] = []
+            for item in json["items"] as! [[String: Any]] {
+              let volumeInfo = item["volumeInfo"] as! [String: Any]
+              let title = volumeInfo["title"] as! String
+              let subtitle = volumeInfo["subtitle"] as! String?
+              let authors = (volumeInfo["authors"] as! [String]).joined(separator: " & ")
+              let pageCount = volumeInfo["pageCount"] as! Int32
+              let publishedDate = volumeInfo["publishedDate"] as! String
+              let summary = volumeInfo["description"] as! String
+              let book: BKBook = BKBook.init()
+              book.author = authors
+              book.title = title
+              book.subtitle = subtitle
+              book.title = title
+              book.pageCount = NSNumber.init(value: pageCount)
+              book.publishDate = publishedDate
+              book.summary = summary
+              newBooks.append(book)
+            }
+            DispatchQueue.main.async {
+              completion(newBooks)
+            }
+          }
+        } catch let error {
+          print("json decode error: \(error)")
+          completion(nil)
+        }
+      }
+    }.resume()
+  }
+
+  override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+    return self.books.count
+  }
+
+  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
+    -> UITableViewCell
+  {
+    let cell: BookCell = self.tableView.dequeueReusableCell(withIdentifier: "BookCell") as! BookCell
+    let bookInfo = books[indexPath.row]
+    cell.title.text = bookInfo.title
+    cell.subtitle.text = bookInfo.subtitle
+    if let author = bookInfo.author {
+      cell.byLine.text = "by: \(author)"
+    }
+    weak var weakSelf = self
+    let editAction = UIAction(title: "Edit") { (action) in
+      if let weakSelf = weakSelf {
+        weakSelf.editItem(index: indexPath.row)
+      }
+    }
+    cell.editButton.removeTarget(nil, action: nil, for: .allEvents)
+    cell.editButton.addAction(editAction, for: UIControl.Event.touchUpInside)
+    return cell
+  }
+
+  /**
+   Presents the FlutterViewController that edits the book at the supplied index.
+   */
+  func editItem(index: Int) {
+    let appDelegate = UIApplication.shared.delegate as! AppDelegate
+    let flutterViewController = FlutterViewController.init(
+      engine: appDelegate.engine, nibName: nil, bundle: nil)
+    self.editingIndex = index
+    api.displayBookDetails(self.books[index]) { (error) in
+      if let error = error {
+        print(error)
+      }
+    }
+    self.present(flutterViewController, animated: true, completion: nil)
+  }
+
+  /**
+   Called by Pigeon when the FlutterViewController is dismissed without accepting any edits.
+   */
+  func cancel(_ error: AutoreleasingUnsafeMutablePointer<FlutterError?>) {
+    self.editingIndex = -1
+    self.dismiss(animated: true, completion: nil)
+  }
+
+  /**
+   Called by Pigeon when edits to the book are accepted in the FlutterViewController.
+   */
+  func finishEditing(_ input: BKBook, error: AutoreleasingUnsafeMutablePointer<FlutterError?>) {
+    self.books[editingIndex] = input
+    self.tableView.reloadData()
+    self.editingIndex = -1
+    self.dismiss(animated: true, completion: nil)
+  }
+}

add_to_app/books/ios_books/IosBooks/api.h

@@ -0,0 +1,32 @@
+// Autogenerated from Pigeon (v0.1.17), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+#import <Foundation/Foundation.h>
+@protocol FlutterBinaryMessenger;
+@class FlutterError;
+@class FlutterStandardTypedData;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class BKBook;
+
+@interface BKBook : NSObject
+@property(nonatomic, copy, nullable) NSString * title;
+@property(nonatomic, copy, nullable) NSString * subtitle;
+@property(nonatomic, copy, nullable) NSString * author;
+@property(nonatomic, copy, nullable) NSString * summary;
+@property(nonatomic, copy, nullable) NSString * publishDate;
+@property(nonatomic, strong, nullable) NSNumber * pageCount;
+@end
+
+@interface BKFlutterBookApi : NSObject
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger;
+- (void)displayBookDetails:(BKBook*)input completion:(void(^)(NSError* _Nullable))completion;
+@end
+@protocol BKHostBookApi
+-(void)cancel:(FlutterError *_Nullable *_Nonnull)error;
+-(void)finishEditingBook:(BKBook*)input error:(FlutterError *_Nullable *_Nonnull)error;
+@end
+
+extern void BKHostBookApiSetup(id<FlutterBinaryMessenger> binaryMessenger, id<BKHostBookApi> _Nullable api);
+
+NS_ASSUME_NONNULL_END

add_to_app/books/ios_books/IosBooks/api.m

@@ -0,0 +1,122 @@
+// Autogenerated from Pigeon (v0.1.17), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+#import "api.h"
+#import <Flutter/Flutter.h>
+
+#if !__has_feature(objc_arc)
+#error File requires ARC to be enabled.
+#endif
+
+static NSDictionary* wrapResult(NSDictionary *result, FlutterError *error) {
+  NSDictionary *errorDict = (NSDictionary *)[NSNull null];
+  if (error) {
+    errorDict = [NSDictionary dictionaryWithObjectsAndKeys:
+        (error.code ? error.code : [NSNull null]), @"code",
+        (error.message ? error.message : [NSNull null]), @"message",
+        (error.details ? error.details : [NSNull null]), @"details",
+        nil];
+  }
+  return [NSDictionary dictionaryWithObjectsAndKeys:
+      (result ? result : [NSNull null]), @"result",
+      errorDict, @"error",
+      nil];
+}
+
+@interface BKBook ()
++(BKBook*)fromMap:(NSDictionary*)dict;
+-(NSDictionary*)toMap;
+@end
+
+@implementation BKBook
++(BKBook*)fromMap:(NSDictionary*)dict {
+  BKBook* result = [[BKBook alloc] init];
+  result.title = dict[@"title"];
+  if ((NSNull *)result.title == [NSNull null]) {
+    result.title = nil;
+  }
+  result.subtitle = dict[@"subtitle"];
+  if ((NSNull *)result.subtitle == [NSNull null]) {
+    result.subtitle = nil;
+  }
+  result.author = dict[@"author"];
+  if ((NSNull *)result.author == [NSNull null]) {
+    result.author = nil;
+  }
+  result.summary = dict[@"summary"];
+  if ((NSNull *)result.summary == [NSNull null]) {
+    result.summary = nil;
+  }
+  result.publishDate = dict[@"publishDate"];
+  if ((NSNull *)result.publishDate == [NSNull null]) {
+    result.publishDate = nil;
+  }
+  result.pageCount = dict[@"pageCount"];
+  if ((NSNull *)result.pageCount == [NSNull null]) {
+    result.pageCount = nil;
+  }
+  return result;
+}
+-(NSDictionary*)toMap {
+  return [NSDictionary dictionaryWithObjectsAndKeys:(self.title ? self.title : [NSNull null]), @"title", (self.subtitle ? self.subtitle : [NSNull null]), @"subtitle", (self.author ? self.author : [NSNull null]), @"author", (self.summary ? self.summary : [NSNull null]), @"summary", (self.publishDate ? self.publishDate : [NSNull null]), @"publishDate", (self.pageCount ? self.pageCount : [NSNull null]), @"pageCount", nil];
+}
+@end
+
+@interface BKFlutterBookApi ()
+@property (nonatomic, strong) NSObject<FlutterBinaryMessenger>* binaryMessenger;
+@end
+
+@implementation BKFlutterBookApi
+- (instancetype)initWithBinaryMessenger:(NSObject<FlutterBinaryMessenger>*)binaryMessenger {
+  self = [super init];
+  if (self) {
+    self.binaryMessenger = binaryMessenger;
+  }
+  return self;
+}
+
+- (void)displayBookDetails:(BKBook*)input completion:(void(^)(NSError* _Nullable))completion {
+  FlutterBasicMessageChannel *channel =
+    [FlutterBasicMessageChannel
+      messageChannelWithName:@"dev.flutter.pigeon.FlutterBookApi.displayBookDetails"
+      binaryMessenger:self.binaryMessenger];
+  NSDictionary* inputMap = [input toMap];
+  [channel sendMessage:inputMap reply:^(id reply) {
+    completion(nil);
+  }];
+}
+@end
+void BKHostBookApiSetup(id<FlutterBinaryMessenger> binaryMessenger, id<BKHostBookApi> api) {
+  {
+    FlutterBasicMessageChannel *channel =
+      [FlutterBasicMessageChannel
+        messageChannelWithName:@"dev.flutter.pigeon.HostBookApi.cancel"
+        binaryMessenger:binaryMessenger];
+    if (api) {
+      [channel setMessageHandler:^(id _Nullable message, FlutterReply callback) {
+        FlutterError *error;
+        [api cancel:&error];
+        callback(wrapResult(nil, error));
+      }];
+    }
+    else {
+      [channel setMessageHandler:nil];
+    }
+  }
+  {
+    FlutterBasicMessageChannel *channel =
+      [FlutterBasicMessageChannel
+        messageChannelWithName:@"dev.flutter.pigeon.HostBookApi.finishEditingBook"
+        binaryMessenger:binaryMessenger];
+    if (api) {
+      [channel setMessageHandler:^(id _Nullable message, FlutterReply callback) {
+        FlutterError *error;
+        BKBook *input = [BKBook fromMap:message];
+        [api finishEditingBook:input error:&error];
+        callback(wrapResult(nil, error));
+      }];
+    }
+    else {
+      [channel setMessageHandler:nil];
+    }
+  }
+}