reland add lifecycle enum and fix the scheduleforcedframe (#45133)

* reland add lifecycle enum and fix the scheduleforcedframe

dev/bots/test.dart

@@ -106,6 +106,7 @@ Future<void> main(List<String> args) async {
   print('═' * 80);
   await selectShard(const <String, ShardRunner>{
     'add_to_app_tests': _runAddToAppTests,
+    'add_to_app_life_cycle_tests': _runAddToAppLifeCycleTests,
     'build_tests': _runBuildTests,
     'framework_coverage': _runFrameworkCoverage,
     'framework_tests': _runFrameworkTests,
@@ -358,6 +359,17 @@ Future<void> _runAddToAppTests() async {
   }
 }
 
+Future<void> _runAddToAppLifeCycleTests() async {
+  if (Platform.isMacOS) {
+    print('${green}Running add-to-app life cycle iOS integration tests$reset...');
+    final String addToAppDir = path.join(flutterRoot, 'dev', 'integration_tests', 'ios_add2app_life_cycle');
+    await runCommand('./build_and_test.sh',
+      <String>[],
+      workingDirectory: addToAppDir,
+    );
+  }
+}
+
 Future<void> _runFrameworkTests() async {
   final bq.BigqueryApi bigqueryApi = await _getBigqueryApi();
 

dev/integration_tests/ios_add2app_life_cycle/.gitignore

+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+.DS_Store
+
+## Build generated
+build/
+DerivedData/
+Pods/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+#
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+#
+# After new code Injection tools there's a generated folder /iOSInjectionProject
+# https://github.com/johnno1962/injectionforxcode
+
+iOSInjectionProject/
\ No newline at end of file

dev/integration_tests/ios_add2app_life_cycle/LICENSE

+Copyright 2014 The Chromium Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google Inc. nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

dev/integration_tests/ios_add2app_life_cycle/Podfile

+platform :ios, '12.0'
+
+flutter_application_path = 'flutterapp/'
+
+load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
+
+target 'ios_add2app' do
+  install_all_flutter_pods(flutter_application_path)
+end
+
+target 'ios_add2appTests' do
+  inherit! :search_paths
+  install_flutter_engine_pod
+  pod 'EarlGrey'
+end

dev/integration_tests/ios_add2app_life_cycle/README.md

+# iOS Add2App Life Cycle Test
+
+This application demonstrates some basic functionality for Add2App,
+along with a native iOS ViewController as a baseline and to demonstrate
+interaction.
+
+The following functionality is currently implemented:
+
+1. A regular iOS view controller (UIViewController), similar to the default
+   `flutter create` template (NativeViewController.m).
+1. A FlutterViewController subclass that takes over full screen. Demos showing
+   this both from a cold/fresh engine state and a warm engine state
+   (FullScreenViewController.m).
+1. A demo of pushing a FlutterViewController on as a child view.
+1. A demo of showing both the native and the Flutter views using a platform
+   channel to to interact with each other (HybridViewController.m).
+1. A demo of showing two FlutterViewControllers simultaneously
+   (DualViewController.m).
+
+A few key things are tested here (IntegrationTests.m):
+
+1. The ability to pre-warm the engine and attach/detatch a ViewController from
+   it.
+1. The ability to use platform channels to communicate between views.
+1. The ability to simultaneously run two instances of the engine.
+1. That a FlutterViewController can be freed when no longer in use (also tested
+   from FlutterViewControllerTests.m).
+1. That a FlutterEngine can be freed when no longer in use.
\ No newline at end of file

dev/integration_tests/ios_add2app_life_cycle/build_and_test.sh

+#!/bin/bash
+
+set -e
+
+cd "$(dirname "$0")"
+
+pushd flutterapp
+../../../../bin/flutter build ios --debug --simulator --no-codesign
+popd
+
+pod install
+os_version=$(xcrun --show-sdk-version --sdk iphonesimulator)
+
+PRETTY="cat"
+if which xcpretty; then
+  PRETTY="xcpretty"
+fi
+
+set -o pipefail && xcodebuild \
+  -workspace ios_add2app.xcworkspace \
+  -scheme ios_add2app \
+  -sdk "iphonesimulator$os_version" \
+  -destination "OS=$os_version,name=iPhone X" test | $PRETTY
+

dev/integration_tests/ios_add2app_life_cycle/flutterapp/.gitignore

+.DS_Store
+.dart_tool/
+
+.packages
+.pub/
+
+.idea/
+.vagrant/
+.sconsign.dblite
+.svn/
+
+*.swp
+profile
+
+DerivedData/
+
+.generated/
+
+*.pbxuser
+*.mode1v3
+*.mode2v3
+*.perspectivev3
+
+!default.pbxuser
+!default.mode1v3
+!default.mode2v3
+!default.perspectivev3
+
+xcuserdata
+
+*.moved-aside
+
+*.pyc
+*sync/
+Icon?
+.tags*
+
+build/
+.android/
+.ios/
+.flutter-plugins

dev/integration_tests/ios_add2app_life_cycle/flutterapp/.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 06179457d553b96b4d7421a08ac90535ca2c9632
+  channel: unknown
+
+project_type: module

dev/integration_tests/ios_add2app_life_cycle/flutterapp/README.md

+# ios_add2app_life_cycle_flutter
+
+A new flutter module project.
+
+## Getting Started
+
+For help getting started with Flutter, view our online
+[documentation](https://flutter.dev/).

dev/integration_tests/ios_add2app_life_cycle/flutterapp/lib/main.dart

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+import 'package:flutter/scheduler.dart';
+import 'package:flutter/foundation.dart';
+import 'package:collection/collection.dart';
+
+VoidCallback originalSemanticsListener;
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  // Disconnects semantics listener for testing purposes.
+  originalSemanticsListener = ui.window.onSemanticsEnabledChanged;
+  ui.window.onSemanticsEnabledChanged = null;
+  RendererBinding.instance.setSemanticsEnabled(false);
+  // If the test passes, LifeCycleSpy will rewire the semantics listener back.
+  runApp(const LifeCycleSpy());
+}
+
+/// A Test widget that spies on app life cycle changes.
+///
+/// It will collect the AppLifecycleState sequence during its lifetime, and it
+/// will rewire semantics harness if the sequence it receives matches the
+/// expected list.
+///
+/// Rewiring semantics is a signal to native IOS test that the test has passed.
+class LifeCycleSpy extends StatefulWidget {
+  const LifeCycleSpy();
+
+  @override
+  _LifeCycleSpyState createState() => _LifeCycleSpyState();
+}
+
+class _LifeCycleSpyState extends State<LifeCycleSpy> with WidgetsBindingObserver {
+  final List<AppLifecycleState> _expectedLifeCycleSequence = <AppLifecycleState>[
+    AppLifecycleState.detached,
+    AppLifecycleState.inactive,
+    AppLifecycleState.resumed,
+  ];
+  List<AppLifecycleState> _actualLifeCycleSequence;
+
+  @override
+  void initState(){
+    super.initState();
+    WidgetsBinding.instance.addObserver(this);
+    _actualLifeCycleSequence =  <AppLifecycleState>[
+      SchedulerBinding.instance.lifecycleState
+    ];
+  }
+
+  @override
+  void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
+    super.dispose();
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    setState(() {
+      _actualLifeCycleSequence = List<AppLifecycleState>.from(_actualLifeCycleSequence);
+      _actualLifeCycleSequence.add(state);
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (const ListEquality<AppLifecycleState>().equals(_actualLifeCycleSequence, _expectedLifeCycleSequence)) {
+      // Rewires the semantics harness if test passes.
+      RendererBinding.instance.setSemanticsEnabled(true);
+      ui.window.onSemanticsEnabledChanged = originalSemanticsListener;
+    }
+    return const MaterialApp(
+      title: 'Flutter View',
+      home: Text('test'),
+    );
+  }
+}

dev/integration_tests/ios_add2app_life_cycle/flutterapp/pubspec.yaml

+name: ios_add2app_life_cycle_flutter
+description: A new flutter module project.
+
+# The following defines the version and build number for your application.
+# A version number is three numbers separated by dots, like 1.2.43
+# followed by an optional build number separated by a +.
+# Both the version and the builder number may be overridden in flutter
+# build by specifying --build-name and --build-number, respectively.
+# Read more about versioning at semver.org.
+#
+# This version is used _only_ for the Runner app, which is used if you just do
+# a `flutter run` or a `flutter make-host-app-editable`. It has no impact
+# on any other native host app that you embed your Flutter project into.
+version: 1.0.0+1
+
+environment:
+  sdk: ">=2.0.0-dev.68.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  cupertino_icons: 0.1.2
+
+  collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  meta: 1.1.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  typed_data: 1.1.6 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  vector_math: 2.0.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  # For information on the generic Dart part of this file, see the
+  # following page: https://dart.dev/tools/pub/pubspec
+
+  archive: 2.0.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  args: 1.5.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  async: 2.4.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  boolean_selector: 1.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  charcode: 1.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  crypto: 2.1.3 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  image: 2.1.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  matcher: 0.12.6 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  path: 1.6.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  pedantic: 1.8.0+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  petitparser: 2.4.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  quiver: 2.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  source_span: 1.5.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  stack_trace: 1.9.3 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  stream_channel: 2.0.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  string_scanner: 1.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  term_glyph: 1.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  test_api: 0.2.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  xml: 3.5.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+
+flutter:
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add Flutter specific assets to your application, add an assets section,
+  # like this:
+  # assets:
+  #  - images/a_dot_burr.jpeg
+  #  - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware.
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add Flutter specific custom fonts to your application, add a fonts
+  # section here, in this "flutter" section. Each entry in this list should
+  # have a "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages
+
+  # This section identifies your Flutter project as a module meant for
+  # embedding in a native host app.  These identifiers should _not_ ordinarily
+  # be changed after generation - they are used to ensure that the tooling can
+  # maintain consistency when adding or modifying assets and plugins.
+  # They also do not have any bearing on your native host application's
+  # identifiers, which may be completely independent or the same as these.
+  module:
+    androidPackage: com.example.iosadd2appflutter
+    iosBundleIdentifier: com.example.iosAdd2appFlutter
+
+# PUBSPEC CHECKSUM: 712e

dev/integration_tests/ios_add2app_life_cycle/ios_add2app.xcodeproj/project.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?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>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app.xcodeproj/xcshareddata/xcschemes/ios_add2app.xcscheme

+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1100"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "24E221B421A28A0B008ADF09"
+               BuildableName = "ios_add2app.app"
+               BlueprintName = "ios_add2app"
+               ReferencedContainer = "container:ios_add2app.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "24D2933421A29627008787A5"
+               BuildableName = "ios_add2appTests.xctest"
+               BlueprintName = "ios_add2appTests"
+               ReferencedContainer = "container:ios_add2app.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "24E221B421A28A0B008ADF09"
+            BuildableName = "ios_add2app.app"
+            BlueprintName = "ios_add2app"
+            ReferencedContainer = "container:ios_add2app.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "24E221B421A28A0B008ADF09"
+            BuildableName = "ios_add2app.app"
+            BlueprintName = "ios_add2app"
+            ReferencedContainer = "container:ios_add2app.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "24E221B421A28A0B008ADF09"
+            BuildableName = "ios_add2app.app"
+            BlueprintName = "ios_add2app"
+            ReferencedContainer = "container:ios_add2app.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:ios_add2app.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?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>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/AppDelegate.h

+// Copyright 2018 The Flutter Authors. 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/UIKit.h>
+#import <Flutter/Flutter.h>
+
+@interface AppDelegate : FlutterAppDelegate
+
+@property(nonatomic, strong, readonly) FlutterEngine* engine;
+
+@end

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/AppDelegate.m

+// Copyright 2018 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "AppDelegate.h"
+#import "MainViewController.h"
+
+@interface AppDelegate ()
+
+@property(nonatomic, strong, readwrite) FlutterEngine* engine;
+
+@end
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+
+  MainViewController *mainViewController = [[MainViewController alloc] init];
+  UINavigationController *navigationController = [[UINavigationController alloc]
+      initWithRootViewController:mainViewController];
+
+  navigationController.navigationBar.translucent = NO;
+
+  self.engine = [[FlutterEngine alloc] initWithName:@"test" project:nil];
+  [self.engine runWithEntrypoint:nil];
+
+  self.window.rootViewController = navigationController;
+  [self.window makeKeyAndVisible];
+
+  return YES;
+}
+
+@end

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/Assets.xcassets/AppIcon.appiconset/Contents.json

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

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/Assets.xcassets/Contents.json

+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/FullScreenViewController.h

+// Copyright 2018 The Flutter Authors. 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/Flutter.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FullScreenViewController : FlutterViewController
+
+@end
+
+NS_ASSUME_NONNULL_END

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/FullScreenViewController.m

+// Copyright 2018 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "FullScreenViewController.h"
+
+@interface FullScreenViewController ()
+
+@end
+
+@implementation FullScreenViewController
+
+-(void)viewWillAppear:(BOOL)animated {
+  [super viewWillAppear:animated];
+  self.title = @"Full Screen Flutter";
+  self.navigationController.navigationBarHidden = YES;
+  self.navigationController.hidesBarsOnSwipe = YES;
+}
+
+-(void)viewWillDisappear:(BOOL)animated {
+  [super viewWillDisappear:animated];
+  self.navigationController.navigationBarHidden = NO;
+  self.navigationController.hidesBarsOnSwipe = NO;
+  if (self.isMovingFromParentViewController) {
+    // Note that if we were doing things that might cause the VC
+    // to disappear (like using the image_picker plugin)
+    // we shouldn't do this.  But in this case we know we're
+    // just going back to the navigation controller.
+    // If we needed Flutter to tell us when we could actually go away,
+    // we'd need to communicate over a method channel with it.
+    [self.engine setViewController:nil];
+  }
+}
+
+-(BOOL)prefersStatusBarHidden {
+  return true;
+}
+
+@end

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/Info.plist

+<?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>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>Launch Screen</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>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/Launch Screen.storyboard

+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14313.18" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14283.14"/>
+        <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"/>
+                        <subviews>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="© 2018 The Flutter Authors. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="obG-Y5-kRd">
+                                <rect key="frame" x="0.0" y="626" width="375" height="21"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="ios_add2app" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="GJd-Yh-RWb">
+                                <rect key="frame" x="0.0" y="202" width="375" height="43"/>
+                                <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
+                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="centerX" secondItem="obG-Y5-kRd" secondAttribute="centerX" id="5cz-MP-9tL"/>
+                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="centerX" secondItem="GJd-Yh-RWb" secondAttribute="centerX" id="Q3B-4B-g5h"/>
+                            <constraint firstItem="obG-Y5-kRd" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" symbolic="YES" id="SfN-ll-jLj"/>
+                            <constraint firstAttribute="bottom" secondItem="obG-Y5-kRd" secondAttribute="bottom" constant="20" id="Y44-ml-fuU"/>
+                            <constraint firstItem="GJd-Yh-RWb" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="bottom" multiplier="1/3" constant="1" id="moa-c2-u7t"/>
+                            <constraint firstItem="GJd-Yh-RWb" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" constant="20" symbolic="YES" id="x7j-FC-K8j"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="Bcu-3y-fUS"/>
+                    </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>

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/MainViewController.h

+// Copyright 2018 The Flutter Authors. 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/UIKit.h>
+#import <Flutter/Flutter.h>
+
+@interface MainViewController : UIViewController
+
+@end

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/MainViewController.m

+// Copyright 2018 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "MainViewController.h"
+
+#import "AppDelegate.h"
+#import "FullScreenViewController.h"
+
+@interface MainViewController ()
+
+@property(nonatomic, strong) UIStackView* stackView;
+
+@end
+
+
+@implementation MainViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  [self.view setFrame:self.view.window.bounds];
+  self.title = @"Flutter iOS Demos";
+  self.view.backgroundColor = UIColor.whiteColor;
+
+  self.stackView = [[UIStackView alloc] initWithFrame:self.view.frame];
+  self.stackView.axis = UILayoutConstraintAxisVertical;
+  self.stackView.distribution = UIStackViewDistributionEqualSpacing;
+  self.stackView.alignment = UIStackViewAlignmentCenter;
+  self.stackView.autoresizingMask =
+      UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+  self.stackView.layoutMargins = UIEdgeInsetsMake(0, 0, 50, 0);
+  self.stackView.layoutMarginsRelativeArrangement = YES;
+  [self.view addSubview:_stackView];
+
+  [self addButton:@"Full Screen (Cold)" action:@selector(showFullScreenCold)];
+}
+
+- (void)showFullScreenCold {
+  FlutterEngine *engine =
+      [(AppDelegate *)[[UIApplication sharedApplication] delegate] engine];
+
+  FullScreenViewController *flutterViewController =
+      [[FullScreenViewController alloc] initWithEngine:engine
+                                               nibName:nil
+                                                bundle:nil];
+  [self.navigationController
+      pushViewController:flutterViewController
+                animated:NO]; // Animating this is janky because of
+                              // transitions with header on the native side.
+                              // It's especially bad with a cold engine.
+}
+
+- (void)addButton:(NSString *)title action:(SEL)action {
+  UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
+  [button setTitle:title forState:UIControlStateNormal];
+  [button addTarget:self
+                action:action
+      forControlEvents:UIControlEventTouchUpInside];
+  [self.stackView addArrangedSubview:button];
+}
+
+@end

dev/integration_tests/ios_add2app_life_cycle/ios_add2app/main.m

+// Copyright 2018 The Flutter Authors. 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/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+  @autoreleasepool {
+      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}

dev/integration_tests/ios_add2app_life_cycle/ios_add2appTests/Info.plist

+<?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>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

dev/integration_tests/ios_add2app_life_cycle/ios_add2appTests/IntegrationTests.m

+// Copyright 2018 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <EarlGrey/EarlGrey.h>
+#import <XCTest/XCTest.h>
+
+#import "AppDelegate.h"
+#import "FullScreenViewController.h"
+
+@interface FlutterTests : XCTestCase
+@end
+
+@implementation FlutterTests
+
+- (void)expectSemanticsNotification:(UIViewController*)viewController
+                             engine:(FlutterEngine*)engine {
+   // Flutter app will only send semantics update if test passes in main.dart.
+  [self expectationForNotification:FlutterSemanticsUpdateNotification object:viewController handler:nil];
+  [self waitForExpectationsWithTimeout:30.0 handler:nil];
+}
+
+- (void)checkAppConnection {
+  FlutterEngine *engine = [((AppDelegate *)[[UIApplication sharedApplication] delegate]) engine];
+  UINavigationController *navController =
+       (UINavigationController *)((AppDelegate *)
+            [[UIApplication sharedApplication]
+                 delegate])
+       .window.rootViewController;
+  __weak UIViewController *weakViewController = navController.visibleViewController;
+  [self expectSemanticsNotification:weakViewController
+                             engine:engine];
+  GREYAssertNotNil(weakViewController,
+                   @"Expected non-nil FullScreenViewController.");
+}
+
+- (void)testFullScreenCanPop {
+  [[EarlGrey selectElementWithMatcher:grey_keyWindow()]
+      assertWithMatcher:grey_sufficientlyVisible()];
+  [[EarlGrey selectElementWithMatcher:grey_buttonTitle(@"Full Screen (Cold)")]
+      performAction:grey_tap()];
+  [self checkAppConnection];
+}
+
+@end

packages/flutter/lib/src/scheduler/binding.dart

@@ -330,10 +330,9 @@ mixin SchedulerBinding on BindingBase, ServicesBinding {
         _setFramesEnabledState(true);
         break;
       case AppLifecycleState.paused:
+      case AppLifecycleState.detached:
         _setFramesEnabledState(false);
         break;
-      default:
-        break;
     }
   }
 
@@ -350,6 +349,8 @@ mixin SchedulerBinding on BindingBase, ServicesBinding {
         return AppLifecycleState.resumed;
       case 'AppLifecycleState.inactive':
         return AppLifecycleState.inactive;
+      case 'AppLifecycleState.detached':
+        return AppLifecycleState.detached;
     }
     return null;
   }
@@ -800,6 +801,11 @@ mixin SchedulerBinding on BindingBase, ServicesBinding {
   /// Consider using [scheduleWarmUpFrame] instead if the goal is to update the
   /// rendering as soon as possible (e.g. at application startup).
   void scheduleForcedFrame() {
+    // TODO(chunhtai): Removes the if case once the issue is fixed
+    // https://github.com/flutter/flutter/issues/45131
+    if (!_framesEnabled)
+      return;
+
     if (_hasScheduledFrame)
       return;
     assert(() {

packages/flutter/test/widgets/binding_test.dart

@@ -67,6 +67,10 @@ void main() {
     message = const StringCodec().encodeMessage('AppLifecycleState.inactive');
     await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
     expect(observer.lifecycleState, AppLifecycleState.inactive);
+
+    message = const StringCodec().encodeMessage('AppLifecycleState.detached');
+    await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
+    expect(observer.lifecycleState, AppLifecycleState.detached);
   });
 
   testWidgets('didPushRoute callback', (WidgetTester tester) async {
@@ -101,6 +105,16 @@ void main() {
     await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
     expect(tester.binding.hasScheduledFrame, isFalse);
 
+    message = const StringCodec().encodeMessage('AppLifecycleState.detached');
+    await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
+    expect(tester.binding.hasScheduledFrame, isFalse);
+
+    message = const StringCodec().encodeMessage('AppLifecycleState.inactive');
+    await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
+    expect(tester.binding.hasScheduledFrame, isTrue);
+    await tester.pump();
+    expect(tester.binding.hasScheduledFrame, isFalse);
+
     message = const StringCodec().encodeMessage('AppLifecycleState.paused');
     await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
     expect(tester.binding.hasScheduledFrame, isFalse);
@@ -108,9 +122,9 @@ void main() {
     tester.binding.scheduleFrame();
     expect(tester.binding.hasScheduledFrame, isFalse);
 
+    // TODO(chunhtai): fix this test after workaround is removed
+    // https://github.com/flutter/flutter/issues/45131
     tester.binding.scheduleForcedFrame();
-    expect(tester.binding.hasScheduledFrame, isTrue);
-    await tester.pump();
     expect(tester.binding.hasScheduledFrame, isFalse);
 
     int frameCount = 0;