Building for iOS/iPadOS

This guide will walk you through the process of installing Convai-powered Unity applications on iOS and iPadOS devices.

Prerequisites

Before you begin, make sure you have the following:

• Unity 2022.3 or later

• Xcode (latest version recommended)

• Apple Developer account

• Project with Convai's Unity SDK integrated and running properly

• MacBook for building and deploying to iOS/iPadOS

Step 1: Prepare Your Unity Project

1. Open your Convai-powered Unity project.

2. Ensure you have the latest version of the Convai Unity SDK imported and setup into your project.

Unity project with Convai SDK imported

Step 2: Configure Build Settings

1. In Unity, go to File → Build Settings.

2. Select iOS as the target platform.

3. Click Switch Platform if it's not already selected.

4. Check the Development Build option for testing purposes.

Unity Build Settings window with iOS selected and Development Build checked

If you wish to add a few required files manually, follow step 3. If you want it to be done automatically, jump to step 4

Step 3: Manually add Required Files

Add link.xml

1. Create a new file named link.xml in your project's Assets folder.

2. Add the following content to the file:

<linker>
  <assembly fullname="UnityEngine">
    <type fullname="UnityEngine.Application" preserve="fields">
      <property name="platform"/>
    </type>
  </assembly>
</linker>

Unity project view showing the link.xml file in the Assets folder

This file prevents potential FileNotFoundException errors related to the libgrpc_csharp_ext.x64.dylib file.

Add BuildIos.cs Script

1. Create a new C# script in Assets/Convai/Scripts named iOSBuild.cs.

2. Add the following content to the script:

#if UNITY_EDITOR && UNITY_IOS
using System.IO;
using UnityEditor;
using UnityEditor.Callbacks;
using UnityEditor.iOS.Xcode;
using UnityEngine;

public class iOSBuild : MonoBehaviour
{
    [PostProcessBuild]
    public static void OnPostProcessBuild(BuildTarget target, string path)
    {
        string projectPath = PBXProject.GetPBXProjectPath(path);
        PBXProject project = new PBXProject();
        project.ReadFromString(File.ReadAllText(projectPath));
#if UNITY_2019_3_OR_NEWER
        string targetGuid = project.GetUnityFrameworkTargetGuid();
#else
        string targetGuid = project.TargetGuidByName(PBXProject.GetUnityTargetName());
#endif
        project.AddFrameworkToProject(targetGuid, "libz.tbd", false);
        project.SetBuildProperty(targetGuid, "ENABLE_BITCODE", "NO");
        File.WriteAllText(projectPath, project.WriteToString());
    }
}
#endif

Step 4: Install required gRPC dlls for iOS:

1. Go to Convai -> Custom Package Installer

2. Click on Install iOS Build Package

3. Attach the script iOSBuild.cs to any GameObject in your scene.

Step 5: Build the Xcode Project

1. In Unity, go to File → Build Settings.

2. Click Build and choose a location to save your Xcode project.

3. Wait for Unity to generate the Xcode project.

Step 6: Configure and Build in Xcode

1. Open the generated Xcode project.

2. In Xcode, select your project in the navigator.

3. Select your target under the "TARGETS" section.

4. Go to the "Signing & Capabilities" tab.

5. Ensure that "Automatically manage signing" is checked.

6. Select your Team from the dropdown (you need an Apple Developer account for this).

7. If needed, change the Bundle Identifier to a unique string.

Xcode window showing the Signing & Capabilities tab with Team and Bundle Identifier fields highlighted

Step 7: Build and Run

1. Connect your iOS device to your Mac.

2. In Xcode, select your connected device as the build target.

3. Click the "Play" button or press Cmd + R to build and run the app on your device.

Xcode toolbar showing the connected device selected and the "Play" button highlighted

Troubleshooting

• If you encounter any build errors, ensure all the steps above have been followed correctly.

• Check that your Apple Developer account has the necessary provisioning profiles and certificates.

• If you face any GRPC-related issues, verify that the libgrpc_csharp_ext.a and libgrpc.a files are correctly placed in the Assets/Convai/Plugins/gRPC/Grpc.Core/runtime/ios folder.