Is it possible to pre-compile the unitylibrary for android/ios to later run with Codemagic

[emileswain]

This article shows how codemagic can be used to compile Unity as a library projects in the cloud.

I'd like to save my build minutes so i'm wondering if there is a way to pre-build the unityLibrary packages that Unity generates into something smaller?

As it stands, the android/unitylibrary and ios/unitylibrary folders are both GB's in size, making it impractical to check them in. And whilsts the Unity project is only 200MB itself, I feel that getting code magic to compile Unity is going to be a big hassel, (also I believe you need a pro license?).

I'm wondering if there is a way to only provide specific assets that the flutter build process needs? i.e. not all 4GB of unitylibrary folder assets for ios and android?

[timbotimbo]

Unity used to do this.

Up to 2019.3.x it compiled everything in the build/export phase and Flutter only needed to include a small compiled project.
See the android/unityLibrary folder in this repo

Any newer version exports a project that still needs to compile and which makes the Flutter build experience worse.

I've complained on the unity forums, but this is simply their 'improved' android export.

I don't think there is an easy way. The only possibility might be to extract it from the flutter build folder after a build (I see a unitylibrary folder in there). But getting that working as a valid gradle project might be a nightmare.

[emileswain]

Thanks for the heads up. Yeah, i was wondering if it was going to be worth investigating how gradle libraries etc work to see if a pre-compile would work, sounds like it would be horendous. If i find anything out i'll update this thread.

[timbotimbo]

I found something that works on Android once you have both exported unity and made a build in Flutter.

This output is from 2022.3.21, it might be slightly different for other Unity versions.

1

Open the android/unityLibrary folder.
Delete build and symbols.

- build/
libs/
src/
- symbols/
build.gradle
proguard-unity.txt

2

Open unityLibrary/src/main, delete Il2CppOutputProject.

assets/
- Il2CppOutputProject/
java/
jniLibs/
jniStaticLibs/
res/
resources/
AndroidManifest.xml

3

Now open unityLibrary/build.gradle

Delete everything below the first android section

android {
    
    compileSdkVersion ..
    buildToolsVersion ..

    ..

    packagingOptions {
        doNotStrip '*/armeabi-v7a/*.so'
        doNotStrip '*/arm64-v8a/*.so'
    }
}


# Delete everything below this

- def getSdkDir() {
- ...
- }

- def BuildIl2Cpp(...) {
- ...
- }

- android {
-    task BuildIl2CppTask {
-    }
-   ..
- }

With these changes my android unityLibrary folder is around 145MB (basic unity project) and it still works after a flutter clean.

[emileswain]

This is great thanks! I was heading in the right direction at least. So will try this out when I go back to the build setup. Its crazy how the build process duplicates those so files into multiple locations. its literally 800MB of duplicated files and then 4GB of build files. Unity really does take liberties with your disc space.

[foreg]

Hi @emileswain @timbotimbo, by any chance, did you figure out a way to make it work on iOS?

[emileswain]

I didn’t look any further into it because my project was a POC and hasn’t got to codemagic yet. May do later this year. I think the last message from timbitimbo in discourse had an approach on how to do it. But I didn’t validate it myself.

…

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[HelloWorldImW]

iOS can use this way:

1. modify flutter_unity_widget.podspec

#
# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
# Run `pod lib lint flutter_unity_widget.podspec' to validate before publishing.
#
Pod::Spec.new do |s|
  s.name             = 'flutter_unity_widget'
  s.version          = '4.0.0'
  s.summary          = 'Flutter unity 3D widget for embedding unity in flutter'
  s.description      = <<-DESC
A new Flutter plugin.
                       DESC
  s.homepage         = 'http://xraph.com'
  s.license          = { :file => '../LICENSE' }
  s.author           = { 'Rex Isaac Raphael' => 'rex.raphael@outlook.com' }
  s.source           = { :path => '.' }
  s.source_files = 'Classes/**/*'
  s.public_header_files = 'Classes/**/*.h'
  
  s.dependency 'Flutter'
  s.platform = :ios, '8.0'
  s.frameworks = 'TuanjieFramework'

  s.vendored_frameworks = 'UnityLibrary/*.framework'

  # Flutter.framework does not contain a i386 slice.
  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
  s.swift_version = '5.0'

  s.xcconfig = {
     'FRAMEWORK_SEARCH_PATHS' => '"${PODS_ROOT}/../UnityLibrary" "${PODS_ROOT}/../.symlinks/flutter/ios-release" "${PODS_CONFIGURATION_BUILD_DIR}"',
     'OTHER_LDFLAGS' => '$(inherited) -framework TuanjieFramework ${PODS_LIBRARIES}'
  }
  
  s.resource_bundles = {'flutter_unity_widget_privacy' => ['Resources/PrivacyInfo.xcprivacy']}
end

**TuanjieFramework ** could rename to your UnityFramework
2. Create a new folder under the current file directory named UnityLibrary
3. Copy this Script to [root]/example/ios/UnityLibrary/build_ios_framework.sh

#!/bin/bash

# 配置参数
TARGET_NAME="TuanjieFramework"   # 替换为你的Target名称
CONFIGURATION=${1:-Release}         # 传入参数指定Debug/Release，默认Release

# 清理并编译Framework
xcodebuild clean build \
    -project "Tuanjie-iPhone.xcodeproj" \
    -target "$TARGET_NAME" \
    -sdk iphoneos \
    -configuration "$CONFIGURATION" \
    CODE_SIGN_IDENTITY="" \
    CODE_SIGNING_REQUIRED=NO

# 检查编译结果
if [ $? -ne 0 ]; then
    echo "❌ 编译失败"
    exit 1
fi

# 定义输出路径
BUILD_PATH="${CONFIGURATION}-iphoneos/${TARGET_NAME}.framework"

# 创建输出目录并复制Framework
echo "🗂  正在导出Framework..."
mkdir -p Output
rm -rf "Output/${TARGET_NAME}.framework"
cp -r "build/${BUILD_PATH}" "Output/"

echo "✅ 成功导出到：$(pwd)/Output/${TARGET_NAME}.framework"

# 将Framework拷贝到../../../ios/UnityLibrary中, 如果有旧的替换掉
echo "🗂  正在拷贝Framework到UnityLibrary..."
rm -rf "../../../ios/UnityLibrary/${TARGET_NAME}.framework"
cp -r "Output/${TARGET_NAME}.framework" "../../../ios/UnityLibrary/"
echo "✅ 成功拷贝Framework到UnityLibrary"

open ../../../ios/UnityLibrary/

that all, hope to help you.

Hi @emileswain @timbotimbo, by any chance, did you figure out a way to make it work on iOS?