Merge pull request #23 from krispypen/master

Adding iOS support

README.md

@@ -8,7 +8,7 @@
 [![Watch on GitHub][github-watch-badge]][github-watch]
 [![Star on GitHub][github-star-badge]][github-star]
 
-Flutter unity 3D widget for embedding unity in flutter. Add a Flutter widget to show unity. Works on Android, iOS in works.
+Flutter unity 3D widget for embedding unity in flutter. Add a Flutter widget to show unity. Works on Android and iOS.
 
 ## Installation
  First depend on the library by adding this to your packages `pubspec.yaml`:
@@ -27,9 +27,10 @@ import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 
 ## Preview
 
-Android (30 fps gif, showcasing communication between Flutter and Unity):
+30 fps gifs, showcasing communication between Flutter and Unity:
 
 ![gif](https://github.com/snowballdigital/flutter-unity-view-widget/blob/master/preview_android.gif?raw=true)
+![gif](https://github.com/snowballdigital/flutter-unity-view-widget/blob/master/preview_ios.gif?raw=true)
 
 <br />
 
@@ -60,9 +61,11 @@ Now your project files should look like this.
 
 1. First Open Unity Project.
 
-2. Click Menu: File => Build Settings => Player Settings
+2. Click Menu: File => Build Settings
 
-3. Change `Product Name` to Name of the Xcode project, You can find it follow `ios/${XcodeProjectName}.xcodeproj`.
+Be sure you have at least one scene added to your build.
+
+3. => Player Settings
 
    **Android Platform**:
     1. Make sure your `Graphics APIs` are set to OpenGLES3 with a fallback to OpenGLES2 (no Vulkan)
@@ -74,20 +77,22 @@ Now your project files should look like this.
         - ARM64        ✅
         - x86          ✅
 
+<img src="https://raw.githubusercontent.com/snowballdigital/flutter-unity-view-widget/master/Screenshot%202019-03-27%2007.31.55.png" width="400" />
 
-   **IOS Platform**:
-    1. Other Settings find the Rendering part, uncheck the `Auto   Graphics API` and select only `OpenGLES2`.
-    2. Depending on where you want to test or run your app, (simulator or physical device), you should select the appropriate SDK on `Target SDK`.
+   **iOS Platform**:
+    1. This only works with Unity version >=2019.3 because uses Unity as a library!
+    2. Other Settings find the Rendering part, uncheck the `Auto   Graphics API` and select only `OpenGLES3`.
+    3. Depending on where you want to test or run your app, (simulator or physical device), you should select the appropriate SDK on `Target SDK`.
       <br />
 
 
-      <img src="https://raw.githubusercontent.com/snowballdigital/flutter-unity-view-widget/master/Screenshot%202019-03-27%2007.31.55.png" width="400" />
+      
 
 <br />
 
 ### Add Unity Build Scripts and Export
 
-Copy [`Build.cs`](https://github.com/snowballdigital/flutter-unity-view-widget/tree/master/scripts/Editor/Build.cs) and [`XCodePostBuild.cs`](https://github.com/f111fei/react-native-unity-demo/blob/master/unity/Cube/Assets/Scripts/Editor/XCodePostBuild.cs) to `unity/<Your Unity Project>/Assets/Scripts/Editor/`
+Copy [`Build.cs`](https://github.com/snowballdigital/flutter-unity-view-widget/tree/master/scripts/Editor/Build.cs) and [`XCodePostBuild.cs`](https://github.com/snowballdigital/flutter-unity-view-widget/tree/master/scripts/Editor/XCodePostBuild.cs) to `unity/<Your Unity Project>/Assets/Scripts/Editor/`
 
 Open your unity project in Unity Editor. Now you can export the Unity project with `Flutter/Export Android` (for Unity versions up to 2019.2), `Flutter/Export Android (Unity 2019.3.*)` (for Unity versions 2019.3 and up, which uses the new [Unity as a Library](https://blogs.unity3d.com/2019/06/17/add-features-powered-by-unity-to-native-mobile-apps/) export format), or `Flutter/Export IOS` menu.
 
@@ -123,6 +128,24 @@ IOS will export unity project to `ios/UnityExport`.
     }
 ```
 
+**iOS Platform Only**
+
+  1. open your ios/Runner.xcworkspace (workspace!, not the project) in Xcode and add the exported project in the workspace root (with a right click in the Navigator, not on an item -> Add Files to “Runner” -> add the UnityExport/Unity-Iphone.xcodeproj file
+  <img src="workspace.png" width="400" />
+  2. Select the Unity-iPhone/Data folder and change the Target Membership for Data folder to UnityFramework
+  <img src="change_target_membership_data_folder.png" width="400" />
+  3. Add this to your Runner/Runner/Runner-Bridging-Header.h
+
+```c
+#import "UnityUtils.h"
+```
+  4. Add to AppDelegate.swift before the GeneratePluginRegistrant call:
+
+```swift
+InitArgs(CommandLine.argc, CommandLine.unsafeArgv)
+```
+  5. Opt-in to the embedded views preview by adding a boolean property to the app's `Info.plist` file with the key `io.flutter.embedded_views_preview` and the value `YES`.
+
 <br />
 
 ### AR Foundation (ANDROID only at the moment)
@@ -274,7 +297,6 @@ class _UnityDemoScreenState extends State<UnityDemoScreen>{
  - `resume()` (Use this to resume unity player)
 
 ## Known issues
- - no iOS support yet
  - Android Export requires several manual changes
  - Using AR will make the activity run in full screen (hiding status and navigation bar).
 

ios/Classes/FlutterUnity.h

@@ -1,25 +0,0 @@
-//
-// Created by rex on 19/03/2019.
-//
-
-#ifndef FLUTTER_UNITY_WIDGET_FLUTTERUNITY_H
-#define FLUTTER_UNITY_WIDGET_FLUTTERUNITY_H
-
-
-#import <Flutter/Flutter.h>
-
-@interface FlutterUnityController : NSObject <FlutterPlatformView>
-
-- (instancetype)initWithWithFrame:(CGRect)frame
-                   viewIdentifier:(int64_t)viewId
-                        arguments:(id _Nullable)args
-                  binaryMessenger:(NSObject<FlutterBinaryMessenger>*)messenger;
-
-- (UIView*)view;
-@end
-
-@interface FlutterUnityFactory : NSObject <FlutterPlatformViewFactory>
-- (instancetype)initWithMessenger:(NSObject<FlutterBinaryMessenger>*)messenger;
-@end
-
-#endif //FLUTTER_UNITY_WIDGET_FLUTTERUNITY_H

ios/Classes/FlutterUnity.m

@@ -1,87 +0,0 @@
-//
-// Created by rex on 19/03/2019.
-//
-
-#include "FlutterUnity.h"
-
-@implementation FlutterUnityFactory {
-  NSObject<FlutterBinaryMessenger>* _messenger;
-}
-
-- (instancetype)initWithMessenger:(NSObject<FlutterBinaryMessenger>*)messenger {
-  self = [super init];
-  if (self) {
-    _messenger = messenger;
-  }
-  return self;
-}
-
-
-@implementation FlutterUnityController {
-  WKWebView* _webView;
-  int64_t _viewId;
-  FlutterMethodChannel* _channel;
-}
-
-- (instancetype)initWithWithFrame:(CGRect)frame
-                   viewIdentifier:(int64_t)viewId
-                        arguments:(id _Nullable)args
-                  binaryMessenger:(NSObject<FlutterBinaryMessenger>*)messenger {
-  if ([super init]) {
-    _viewId = viewId;
-    _webView = [[WKWebView alloc] initWithFrame:frame];
-    NSString* channelName = [NSString stringWithFormat:@"nativeweb_%lld", viewId];
-    _channel = [FlutterMethodChannel methodChannelWithName:channelName binaryMessenger:messenger];
-    __weak __typeof__(self) weakSelf = self;
-    [_channel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
-      [weakSelf onMethodCall:call result:result];
-    }];
-
-  }
-  return self;
-}
-
-- (UIView*)view {
-  return _webView;
-}
-
-- (void)onMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
-  if ([[call method] isEqualToString:@"postMessage"]) {
-    [self postMessage:call result:result];
-  } else if ([[call method] isEqualToString:@"isReady"]) {
-    [self postMessage:call result:result];
-  } else if ([[call method] isEqualToString:@"createUnity"]) {
-    [self postMessage:call result:result];
-  } else if ([[call method] isEqualToString:@"pause"]) {
-    [self postMessage:call result:result];
-  } else if ([[call method] isEqualToString:@"resume"]) {
-    [self postMessage:call result:result];
-  } else {
-    result(FlutterMethodNotImplemented);
-  }
-}
-
-- (void)postMessage:(FlutterMethodCall*)call result:(FlutterResult)result {
-  NSString* url = [call arguments];
-  if (![self postMessage:url]) {
-    result([FlutterError errorWithCode:@"loadUrl_failed"
-                               message:@"Failed parsing the URL"
-                               details:[NSString stringWithFormat:@"URL was: '%@'", url]]);
-  } else {
-    result(nil);
-  }
-}
-
-- (bool)onPostMessage:(NSString*)url {
-  NSURL* nsUrl = [NSURL URLWithString:url];
-  if (!nsUrl) {
-    return false;
-  }
-  NSURLRequest* req = [NSURLRequest requestWithURL:nsUrl];
-  [_webView loadRequest:req];
-  return true;
-}
-
-@end
-
-

ios/Classes/FlutterUnityView.h

@@ -0,0 +1,18 @@
+//
+//  FlutterUnityView.h
+//  FlutterUnityView
+//
+//  Created by krispypen on 8/1/2019
+//
+
+#import <UIKit/UIKit.h>
+
+#import "UnityUtils.h"
+
+@interface FlutterUnityView : UIView
+
+@property (nonatomic, strong) UIView* uView;
+
+- (void)setUnityView:(UIView *)view;
+
+@end

ios/Classes/FlutterUnityView.m

@@ -0,0 +1,37 @@
+//
+//  FlutterUnityView.m
+//  FlutterUnityView
+//
+//  Created by krispypen on 8/1/2019
+//
+
+#import "FlutterUnityView.h"
+
+@implementation FlutterUnityView
+
+- (id)initWithFrame:(CGRect)frame
+{
+    self = [super initWithFrame:frame];
+    return self;
+}
+
+- (void)dealloc
+{
+}
+
+- (void)setUnityView:(UIView *)view
+{
+    self.uView = view;
+    [self setNeedsLayout];
+}
+
+- (void)layoutSubviews
+{
+    [super layoutSubviews];
+    [(UIView *)self.uView removeFromSuperview];
+    [self insertSubview:(UIView *)self.uView atIndex:0];
+    ((UIView *)self.uView).frame = self.bounds;
+    [(UIView *)self.uView setNeedsLayout];
+}
+
+@end

ios/Classes/FlutterUnityWidgetPlugin.h

@@ -1,4 +1,25 @@
+//
+//  FlutterUnityWidgetPlugin.h
+//  FlutterUnityWidgetPlugin
+//
+//  Created by Kris Pypen on 8/1/19.
+//
+
 #import <Flutter/Flutter.h>
 
 @interface FlutterUnityWidgetPlugin : NSObject<FlutterPlugin>
 @end
+
+@interface FUController : NSObject <FlutterPlatformView>
+
+- (instancetype)initWithFrame:(CGRect)frame
+               viewIdentifier:(int64_t)viewId
+                    arguments:(id _Nullable)args
+              registrar:(NSObject<FlutterPluginRegistrar> *)registrar;
+
+- (UIView*)view;
+@end
+
+@interface FUViewFactory : NSObject <FlutterPlatformViewFactory>
+- (instancetype)initWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar;
+@end

ios/Classes/FlutterUnityWidgetPlugin.m

@@ -1,20 +1,106 @@
+//
+//  FlutterUnityWidgetPlugin.m
+//  FlutterUnityWidgetPlugin
+//
+//  Created by Kris Pypen on 8/1/19.
+//
+
 #import "FlutterUnityWidgetPlugin.h"
-#import <flutter_unity_widget/flutter_unity_widget-Swift.h>
+#import "UnityUtils.h"
+#import "FlutterUnityView.h"
 
-+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
-  FlutterNativeWebFactory* webviewFactory =
-      [[FlutterNativeWebFactory alloc] initWithMessenger:registrar.messenger];
-  [registrar registerViewFactory:webviewFactory withId:@"unity_view"];
-}
-
-
-/*
-#import "FlutterUnityWidgetPlugin.h"
-#import <flutter_unity_widget/flutter_unity_widget-Swift.h>
+#include <UnityFramework/UnityFramework.h>
 
 @implementation FlutterUnityWidgetPlugin
 + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
-  [SwiftFlutterUnityWidgetPlugin registerWithRegistrar:registrar];
+    FUViewFactory* fuviewFactory = [[FUViewFactory alloc] initWithRegistrar:registrar];
+    [registrar registerViewFactory:fuviewFactory withId:@"unity_view"];
 }
 @end
-*/
+
+@implementation FUViewFactory {
+    NSObject<FlutterPluginRegistrar>* _registrar;
+}
+- (instancetype)initWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
+    self = [super init];
+    if (self) {
+        _registrar = registrar;
+    }
+    return self;
+}
+- (NSObject<FlutterMessageCodec>*)createArgsCodec {
+    return [FlutterStandardMessageCodec sharedInstance];
+}
+
+- (NSObject<FlutterPlatformView>*)createWithFrame:(CGRect)frame
+                                   viewIdentifier:(int64_t)viewId
+                                        arguments:(id _Nullable)args {
+    FUController* controller = [[FUController alloc] initWithFrame:frame
+                                                                           viewIdentifier:viewId
+                                                                                arguments:args
+                                                                          registrar:_registrar];
+    return controller;
+}
+
+@end
+
+@implementation FUController {
+    FlutterUnityView* _uView;
+    int64_t _viewId;
+    FlutterMethodChannel* _channel;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+               viewIdentifier:(int64_t)viewId
+                arguments:(id _Nullable)args
+                    registrar:(NSObject<FlutterPluginRegistrar>*)registrar {
+    if ([super init]) {
+        _viewId = viewId;
+        
+        NSString* channelName = [NSString stringWithFormat:@"unity_view_%lld", viewId];
+        _channel = [FlutterMethodChannel methodChannelWithName:channelName binaryMessenger:registrar.messenger];
+        __weak __typeof__(self) weakSelf = self;
+        [_channel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
+            [weakSelf onMethodCall:call result:result];
+        }];
+
+    }
+    return self;
+}
+
+- (void)onMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
+    if ([[call method] isEqualToString:@"postMessage"]) {
+        [self postMessage:call result:result];
+    } else {
+        result(FlutterMethodNotImplemented);
+    }
+}
+
+- (void)postMessage:(FlutterMethodCall*)call result:(FlutterResult)result {
+    NSString* object = [call arguments][@"gameObject"];
+    NSString* method = [call arguments][@"methodName"];
+    NSString* message = [call arguments][@"message"];
+    
+    UnityPostMessage(object, method, message);
+    
+    result(nil);
+}
+
+- (UIView*)view {
+    _uView = [[FlutterUnityView alloc] init];
+    if ([UnityUtils isUnityReady]) {
+        [_uView setUnityView: (UIView*)[GetAppController() unityView]];
+    } else {
+        [UnityUtils createPlayer:^{
+            [_uView setUnityView: (UIView*)[GetAppController() unityView]];
+        }];
+    }
+    return _uView;
+}
+
+@end
+
+
+
+
+

ios/Classes/UnityUtils.h

@@ -1,27 +1,23 @@
-//
-// Created by rex on 15/03/2019.
-//
-
-#ifndef FLUTTER_UNITY_WIDGET_UNITYUTILS_H
-#define FLUTTER_UNITY_WIDGET_UNITYUTILS_H
-
 #import <Foundation/Foundation.h>
 
+#ifndef UnityUtils_h
+#define UnityUtils_h
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-void InitArgs(int argc, char* argv[]);
+    void InitArgs(int argc, char* argv[]);
 
-bool UnityIsInited(void);
+    bool UnityIsInited(void);
 
-void InitUnity();
+    void InitUnity();
 
-void UnityPostMessage(NSString* gameObject, NSString* methodName, NSString* message);
+    void UnityPostMessage(NSString* gameObject, NSString* methodName, NSString* message);
 
-void UnityPauseCommand();
+    void UnityPauseCommand();
 
-void UnityResumeCommand();
+    void UnityResumeCommand();
 
 #ifdef __cplusplus
 } // extern "C"
@@ -40,5 +36,4 @@ void UnityResumeCommand();
 
 @end
 
-#endif //FLUTTER_UNITY_WIDGET_UNITYUTILS_H
-
+#endif /* UnityUtils_h */

ios/Classes/UnityUtils.mm

@@ -1,10 +1,8 @@
-#include "RegisterMonoModules.h"
-#include "RegisterFeatures.h"
 #include <csignal>
 #import <UIKit/UIKit.h>
-#import "UnityInterface.h"
 #import "UnityUtils.h"
-#import "UnityAppController.h"
+
+#include <UnityFramework/UnityFramework.h>
 
 // Hack to work around iOS SDK 4.3 linker problem
 // we need at least one __TEXT, __const section entry in main application .o files
@@ -18,6 +16,8 @@ char** g_argv;
 
 void UnityInitTrampoline();
 
+UnityFramework* ufw;
+
 extern "C" void InitArgs(int argc, char* argv[])
 {
     g_argc = argc;
@@ -29,6 +29,19 @@ extern "C" bool UnityIsInited()
     return unity_inited;
 }
 
+UnityFramework* UnityFrameworkLoad()
+{
+    NSString* bundlePath = nil;
+    bundlePath = [[NSBundle mainBundle] bundlePath];
+    bundlePath = [bundlePath stringByAppendingString: @"/Frameworks/UnityFramework.framework"];
+
+    NSBundle* bundle = [NSBundle bundleWithPath: bundlePath];
+    if ([bundle isLoaded] == false) [bundle load];
+
+    UnityFramework* ufw = [bundle.principalClass getInstance];
+    return ufw;
+}
+
 extern "C" void InitUnity()
 {
     if (unity_inited) {
@@ -36,41 +49,30 @@ extern "C" void InitUnity()
     }
     unity_inited = true;
 
-    UnityInitStartupTime();
+    ufw = UnityFrameworkLoad();
 
-    @autoreleasepool
-    {
-        UnityInitTrampoline();
-        UnityInitRuntime(g_argc, g_argv);
-
-        RegisterMonoModules();
-        NSLog(@"-> registered mono modules %p\n", &constsection);
-        RegisterFeatures();
-
-        // iOS terminates open sockets when an application enters background mode.
-        // The next write to any of such socket causes SIGPIPE signal being raised,
-        // even if the request has been done from scripting side. This disables the
-        // signal and allows Mono to throw a proper C# exception.
-        std::signal(SIGPIPE, SIG_IGN);
-    }
+    [ufw setDataBundleId: "com.unity3d.framework"];
+    [ufw frameworkWarmup: g_argc argv: g_argv];
 }
 
 extern "C" void UnityPostMessage(NSString* gameObject, NSString* methodName, NSString* message)
 {
-    UnitySendMessage([gameObject UTF8String], [methodName UTF8String], [message UTF8String]);
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [ufw sendMessageToGOWithName:[gameObject UTF8String] functionName:[methodName UTF8String] message:[message UTF8String]];
+    });
 }
 
 extern "C" void UnityPauseCommand()
 {
     dispatch_async(dispatch_get_main_queue(), ^{
-        UnityPause(1);
+        [ufw pause:true];
     });
 }
 
 extern "C" void UnityResumeCommand()
 {
     dispatch_async(dispatch_get_main_queue(), ^{
-        UnityPause(0);
+        [ufw pause:false];
     });
 }
 

ios/flutter_unity_widget.podspec

@@ -15,7 +15,11 @@ Flutter unity 3D widget for embedding unity in flutter
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
+  s.frameworks = 'UnityFramework'
 
   s.ios.deployment_target = '8.0'
+  s.xcconfig = { 
+     'FRAMEWORK_SEARCH_PATHS' => '"${PODS_ROOT}/../UnityExport" "${PODS_ROOT}/../.symlinks/flutter/ios-release" "${PODS_CONFIGURATION_BUILD_DIR}"', 
+     'OTHER_LDFLAGS' => '$(inherited) -framework UnityFramework ${PODS_LIBRARIES}'
+   }
 end
-

pubspec.yaml

@@ -3,6 +3,8 @@ description: Flutter unity 3D widget for embedding unity in flutter
 version: 0.1.5
 authors:
   - Rex Raphael <rex.raphael@outlook.com>
+  - Thomas Stockx <thomas@stockxit.com>
+  - Kris Pypen <kris.pypen@gmail.com>
 homepage: https://github.com/snowballdigital/flutter-unity-view-widget/tree/master
 
 environment:

scripts/Editor/XCodePostBuild.cs

@@ -0,0 +1,295 @@
+/*
+MIT License
+Copyright (c) 2017 Jiulong Wang
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#if UNITY_IOS
+
+using System;
+
+using System.Collections.Generic;
+using System.IO;
+
+using UnityEditor;
+using UnityEditor.Callbacks;
+using UnityEditor.iOS.Xcode;
+
+/// <summary>
+/// Adding this post build script to Unity project enables the flutter-unity-widget to access it
+/// </summary>
+public static class XcodePostBuild
+{
+
+    /// <summary>
+    /// The identifier added to touched file to avoid double edits when building to existing directory without
+    /// replace existing content.
+    /// </summary>
+    private const string TouchedMarker = "https://github.com/snowballdigital/flutter-unity-view-widget";
+
+    [PostProcessBuild]
+    public static void OnPostBuild(BuildTarget target, string pathToBuiltProject)
+    {
+        if (target != BuildTarget.iOS)
+        {
+            return;
+        }
+
+        PatchUnityNativeCode(pathToBuiltProject);
+
+        UpdateUnityProjectFiles(pathToBuiltProject);
+    }
+
+    /// <summary>
+    /// We need to add the Data folder to the UnityFramework framework
+    /// </summary>
+    private static void UpdateUnityProjectFiles(string pathToBuiltProject)
+    {
+        var pbx = new PBXProject();
+        var pbxPath = Path.Combine(pathToBuiltProject, "Unity-iPhone.xcodeproj/project.pbxproj");
+        pbx.ReadFromFile(pbxPath);
+
+        // Add UnityExport/Data
+        var targetGuid = pbx.TargetGuidByName("UnityFramework");
+        var fileGuid = pbx.AddFolderReference(Path.Combine(pathToBuiltProject, "Data"), "Data");
+        pbx.AddFileToBuild(targetGuid, fileGuid);
+
+        pbx.WriteToFile(pbxPath);
+    }
+
+    /// <summary>
+    /// Make necessary changes to Unity build output that enables it to be embedded into existing Xcode project.
+    /// </summary>
+    private static void PatchUnityNativeCode(string pathToBuiltProject)
+    {
+        EditUnityFrameworkH(Path.Combine(pathToBuiltProject, "UnityFramework/UnityFramework.h"));
+        EditUnityAppControllerH(Path.Combine(pathToBuiltProject, "Classes/UnityAppController.h"));
+        EditUnityAppControllerMM(Path.Combine(pathToBuiltProject, "Classes/UnityAppController.mm"));
+    }
+
+
+    /// <summary>
+    /// Edit 'UnityFramework.h': add  'frameworkWarmup' 
+    /// </summary>
+    private static void EditUnityFrameworkH(string path)
+    {
+        var inScope = false;
+
+        // Add frameworkWarmup method
+        EditCodeFile(path, line =>
+        {
+            inScope |= line.Contains("- (void)runUIApplicationMainWithArgc:");
+
+            if (inScope)
+            {
+                if (line.Trim() == "")
+                {
+                    inScope = false;
+
+                    return new string[]
+                    {
+                        "",
+                        "// Added by " + TouchedMarker,
+                        "- (void)frameworkWarmup:(int)argc argv:(char*[])argv;",
+                        ""
+                    };
+                }
+            }
+
+            return new string[] { line };
+        });
+    }
+
+    /// <summary>
+    /// Edit 'UnityAppController.h': returns 'UnityAppController' from 'AppDelegate' class.
+    /// </summary>
+    private static void EditUnityAppControllerH(string path)
+    {
+        var inScope = false;
+        var markerDetected = false;
+		
+		// Add static GetAppController
+		EditCodeFile(path, line =>
+        {
+			inScope |= line.Contains("- (void)startUnity:");
+
+			if (inScope)
+			{
+				if (line.Trim() == "")
+				{
+					inScope = false;
+
+					return new string[]
+					{
+						"",
+						"// Added by " + TouchedMarker,
+						"+ (UnityAppController*)GetAppController;",
+						""
+					};
+				}
+			}
+			
+			return new string[] { line };
+		});
+
+		inScope = false;
+		markerDetected = false;
+
+		// Modify inline GetAppController
+        EditCodeFile(path, line =>
+        {
+            inScope |= line.Contains("extern UnityAppController* GetAppController");
+
+            if (inScope && !markerDetected)
+            {
+                if (line.Trim() == "")
+                {
+                    inScope = false;
+					markerDetected = true;
+
+                    return new string[]
+                    {
+                        "// }",
+                        "",
+                        "static inline UnityAppController* GetAppController()",
+                        "{",
+                        "    return [UnityAppController GetAppController];",
+                        "}",
+                    };
+                }
+
+                return new string[] { "// " + line };
+            }
+
+            return new string[] { line };
+        });
+
+
+    }
+
+    /// <summary>
+    /// Edit 'UnityAppController.mm': triggers 'UnityReady' notification after Unity is actually started.
+    /// </summary>
+    private static void EditUnityAppControllerMM(string path)
+    {
+        var inScope = false;
+        var markerDetected = false;
+
+        EditCodeFile(path, line =>
+        {
+            if (line.Trim() == "@end")
+            {
+                return new string[]
+				{
+					"",
+					"// Added by " + TouchedMarker,
+					"static UnityAppController *unityAppController = nil;",
+					"",
+					@"+ (UnityAppController*)GetAppController",
+					"{",
+					"    static dispatch_once_t onceToken;",
+					"    dispatch_once(&onceToken, ^{",
+					"        unityAppController = [[self alloc] init];",
+					"    });",
+					"    return unityAppController;",
+					"}",
+					"",
+					line,
+				};
+            }
+
+            inScope |= line.Contains("- (void)startUnity:");
+            markerDetected |= inScope && line.Contains(TouchedMarker);
+
+            if (inScope && line.Trim() == "}")
+            {
+                inScope = false;
+
+                if (markerDetected)
+                {
+                    return new string[] { line };
+                }
+                else
+                {
+                    return new string[]
+                    {
+                        "    // Modified by " + TouchedMarker,
+                        @"    [[NSNotificationCenter defaultCenter] postNotificationName: @""UnityReady"" object:self];",
+                        "}",
+                    };
+                }
+            }
+
+            return new string[] { line };
+        });
+
+        inScope = false;
+        markerDetected = false;
+
+        // Modify inline GetAppController
+        EditCodeFile(path, line =>
+        {
+            inScope |= line.Contains("UnityAppController* GetAppController()");
+
+            if (inScope && !markerDetected)
+            {
+                if (line.Trim() == "}")
+                {
+                    inScope = false;
+                    markerDetected = true;
+
+                    return new string[]
+                    {
+                        "",
+                    };
+                }
+
+                return new string[] { "// " + line };
+            }
+
+            return new string[] { line };
+        });
+    }
+
+    private static void EditCodeFile(string path, Func<string, IEnumerable<string>> lineHandler)
+    {
+        var bakPath = path + ".bak";
+        if (File.Exists(bakPath))
+        {
+            File.Delete(bakPath);
+        }
+
+        File.Move(path, bakPath);
+
+        using (var reader = File.OpenText(bakPath))
+        using (var stream = File.Create(path))
+        using (var writer = new StreamWriter(stream))
+        {
+            string line;
+            while ((line = reader.ReadLine()) != null)
+            {
+                var outputs = lineHandler(line);
+                foreach (var o in outputs)
+                {
+                    writer.WriteLine(o);
+                }
+            }
+        }
+    }
+}
+
+#endif