react-native-unity-view

Integrate unity3d within a React Native app. Add a react native component to show unity. Works on both iOS and Android.

__If you're using a Unity version older than 2019.3 you can only export to android__

Notice

This is a fork of https://github.com/f111fei/react-native-unity-view
to make it work with React Native >= 0.60.

This project may or may not be updated depending on the further use of it at my workplace, however feel free to fork it

Install

yarn add @asmadsen/react-native-unity-view

Configuration

Since this project uses the exported data from Unity you will have do some extra configuring than a normal React Native module.

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To configure Unity to add the exported files somewhere accessible to your app we use some build scripts. And the default
configuration expects that you place your Unity Project in the following position relative to our app.

``
.
├── android
├── ios
├── unity
│ └── // Example: Cube
├── node_modules
├── package.json
└── README.md
`

#### Add Unity Build scripts

Copy Build.cs and XCodePostBuild.cs and place them in
unity//Assets/Scripts/Editor/

*If you want to place your Unity Project somewhere else you will have to change the following paths which is relative to
the Untiy Project*

* Line 21: Build.cs
* Line 65: Build.cs
* Line 56: XCodePostBuild.cs

#### Player Settings

1. Open your Unity Project
2. Go to Player settings (File => Build Settings => Player Settings)
3. Change Product Name to the name of your Xcode project. (ios/${XcodeProjectName}.xcodeproj)

##### Additional changes for Android Platform

Under Other Settings make sure Scripting Backend is set to IL2CPP, and ARM64 is checked under Target Architectures.

!Android Configruation

Under Other Settings make sure Auto Graphics API is unchecked, and the list only contains OpenGLES3 and OpenGLES2 in that order.

!Android graphics


##### Additional changes for iOS Platform

Under Other Settings make sure Auto Graphics API is checked.

!Player settings for iOS

#### Now Unity is configured and ready

Now you can export the Unity Project using ReactNative => Export Android or ReactNative => Export IOS.

!Build dropdown

Then the exported artifacts will be placed in a folder called UnityExport inside either the android or the ios folder.

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Add the contents of the Assets folder, to your Unity project.

You will have to rebuild for changes to appear in React Native.

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#### Android Build

To allow for the project to recognize the UnityExport folder you will have to add two lines to android/settings.gradle.

1. Add the following to the android/build.gradle
`
flatDir {
dirs "${project(':UnityExport').projectDir}/libs"
}
`
So it looks like this
`
// [..]
allprojects {
repositories {
// [..]
flatDir {
dirs "${project(':UnityExport').projectDir}/libs"
}
}
}
`

2. Add these two lines to android/settings.gradle

`
include ":UnityExport"
project(":UnityExport").projectDir = file("./UnityExport")
`
3. Add this line to dependencies in android/app/build.gradle at the top.

`
implementation project(':UnityExport')
`

##### After Unity Export

#### iOS build

1. Open your ios/{PRODUCT_NAME}.xcworkspace and add the exported project(ios/UnityExport/Unity-Iphone.xcodeproj) to the workspace root

!Add unity ios project to ReactNative Ios workspace

2. Select the Unity-iPhone/Data folder and change the Target Membership to UnityFramework

!Set Target Membership of Data folder to UnityFramework

3. Add UnityFramework.framework as a library to your Project

!Add UnityFramework to project

4. Modify main.m

`objectivec
#import "UnityUtils.h"

int main(int argc, char * argv[]) {
@autoreleasepool {
InitArgs(argc, argv);
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
`

#### android build
1. In UnityExport/build.gradle add the following lines
`
configurations {
release
}
android {
ndkVersion = '19.0.5232133'
`
and replace :unityLibrary with :UnityExport

`
afterEvaluate {
if (project(':UnityExport').tasks.findByName('mergeDebugJniLibFolders'))
project(':UnityExport').mergeDebugJniLibFolders.dependsOn BuildIl2CppTask
if (project(':UnityExport').tasks.findByName('mergeReleaseJniLibFolders'))
project(':UnityExport').mergeReleaseJniLibFolders.dependsOn BuildIl2CppTask
}
`


Use in React Native

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#### onMessage

Receive message from Unity

Make sure you have added UnityMessageManager

##### Example:

1. Send message from Unity
`C#
UnityMessageManager.Instance.SendMessageToRN("click");
`

2. Receive message in React Native
`javascript
onMessage(event) {
console.log('OnUnityMessage: ' + event.nativeEvent.message); // OnUnityMessage: click
}

render() {
return (

style={style.unity}
onMessage={this.onMessage.bind(this)}
/>

);
}
`

#### onUnityMessage

[Recommended]Receive json message from unity.

`
onUnityMessage(handler) {
console.log(handler.name); // the message name
console.log(handler.data); // the message data
setTimeout(() => {
// You can also create a callback to Unity.
handler.send('I am callback!');
}, 2000);
}

render() {
return (

style={style.unity}
onUnityMessage={this.onMessage.bind(this)}
/>

);
}
`

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`
import { UnityModule } from 'react-native-unity-view';
`

#### isReady(): Promise

Return whether is unity ready.

#### createUnity(): Promise

Manual init the Unity. Usually Unity is auto created when the first view is added.

#### postMessage(gameObject: string, methodName: string, message: string)

Send message to unity.

* gameObject The Name of GameObject. Also can be a path string.
* methodName Method name in GameObject instance.
* message The message will post.

Example:

1. Add a message handle method in MonoBehaviour.

`C#
public class Rotate : MonoBehaviour {
void handleMessage(string message) {
Debug.Log("onMessage:" + message);
}
}
`

2. Add Unity component to a GameObject.

3. Send message use javascript.

`javascript
onToggleRotate() {
if (this.unity) {
// gameobject param also can be 'Cube'.
UnityModule.postMessage('GameObject/Cube', 'toggleRotate', 'message');
}
}

render() {
return (

ref={(ref) => this.unity = ref}
style={style.unity}
/>


);
}

`

#### postMessageToUnityManager(message: string | UnityViewMessage)

Send message to UnityMessageManager.

Please copy UnityMessageManager.cs to your unity project and rebuild first.

Same to postMessage('UnityMessageManager', 'onMessage', message)

This is recommended to use.

* message The message will post.

Example:

1. Add a message handle method in C#.

`javascript
void Awake()
{
UnityMessageManager.Instance.OnMessage += toggleRotate;
}

void onDestroy()
{
UnityMessageManager.Instance.OnMessage -= toggleRotate;
}

void toggleRotate(string message)
{
Debug.Log("onMessage:" + message);
canRotate = !canRotate;
}
`

2. Send message use javascript.

`
onToggleRotate() {
UnityModule.postMessageToUnityManager('message');
}

render() {
return (

ref={(ref) => this.unity = ref}
style={style.unity}
/>




);
}
`

#### addMessageListener(listener: (message: string | MessageHandler) => void): number

Receive string and json message from unity.

#### addStringMessageListener(listener: (message: string) => void): number

Only receive string message from unity.

#### addUnityMessageListener(listener: (handler: MessageHandler) => void): number

Only receive json message from unity.

#### pause()

Pause the unity player.

#### resume()

Resume the unity player.




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`
import React from 'react';
import { StyleSheet, Image, View, Dimensions } from 'react-native';
import UnityView from 'react-native-unity-view';

export default class App extends React.Component {
render() {
return (

: null}

Welcome to React Native!


);
}
}
``