如何将Vuforia Unity 2017.3构建的OC iOS项目作为框架集成到Swift iOS项目？

Absolutely! You can definitely package your Unity-built iOS project as a framework and integrate it into a Swift-based iOS app. I’ve gone through this process several times, so here’s a clear, step-by-step breakdown to help you make it work:

1. Configure Unity for Framework Export #

• Fire up your Unity project, head to File > Build Settings, and select iOS as your target platform.
• Click Player Settings, then navigate to the iOS tab > Other Settings:
  • Set the Scripting Backend to IL2CPP (this is non-negotiable for framework compatibility—Mono won’t cut it here).
  • Enable Build as Framework (this option rolled out in Unity 2020+; if you’re stuck on an older version, you’ll either need to upgrade or use a manual packaging workaround).
  • Match your Xcode project’s architecture (usually ARM64 for modern iPhones/iPads) in the Architecture dropdown.

2. Build the Unity Framework #

• Go back to Build Settings, hit Build, and pick an output folder. Unity will generate either a .framework or .xcframework file depending on your settings.
• Once the build finishes, you’ll find the framework in your chosen output directory—look for the file ending with .framework or .xcframework.

3. Integrate the Framework into Your Swift Project #

• Open your Swift iOS project in Xcode.
• Drag and drop the Unity framework into the Frameworks, Libraries, and Embedded Content section of your project. Make sure to check Copy items if needed and select your app target when prompted.
• Head to your app target’s Build Settings:
  • Add -ObjC to Other Linker Flags (this ensures all Unity-specific symbols are linked properly, preventing runtime errors).
  • Set the framework’s Embed option to Embed & Sign (critical for the framework to work on real devices).

4. Bridge Swift and Unity for Communication #

• Unity’s framework uses a C API, so you’ll need an Objective-C bridging header to access it from Swift. If you don’t already have one:
  • Create a new .h file (name it something like UnityBridge.h).
  • In your target’s Build Settings, set the Objective-C Bridging Header path to this new file.
• In the bridging header, import Unity’s core header:

  #import <UnityFramework/UnityFramework.h>
  

• Now you can control Unity directly from Swift. Here’s a quick example to initialize Unity and load a scene:

  import UIKit
  
  class MainViewController: UIViewController {
      private var unityFramework: UnityFramework?
  
      override func viewDidLoad() {
          super.viewDidLoad()
          setupUnityIntegration()
      }
  
      private func setupUnityIntegration() {
          unityFramework = UnityFramework.shared()
          guard let framework = unityFramework else {
              print("Failed to load Unity framework")
              return
          }
  
          // Replace with your Unity project's bundle ID
          framework.setDataBundleId("com.yourcompany.unityproject")
          framework.runEmbedded(withArgc: CommandLine.argc, argv: CommandLine.unsafeArgv, appLaunchOpts: nil)
  
          // Send a message to a Unity GameObject to load a scene
          framework.sendMessageToGO(withName: "SceneManager", functionName: "LoadMainScene", message: "")
      }
  }
  

5. Sync App Lifecycle Events with Unity #

• Unity needs to receive iOS app lifecycle events to behave correctly (like pausing when the app goes to background). Update your AppDelegate or SceneDelegate to pass these events along:

  func applicationDidBecomeActive(_ application: UIApplication) {
      unityFramework?.applicationDidBecomeActive(application)
  }
  
  func applicationWillResignActive(_ application: UIApplication) {
      unityFramework?.applicationWillResignActive(application)
  }
  
  func applicationDidEnterBackground(_ application: UIApplication) {
      unityFramework?.applicationDidEnterBackground(application)
  }
  
  func applicationWillEnterForeground(_ application: UIApplication) {
      unityFramework?.applicationWillEnterForeground(application)
  }
  

Key Things to Keep in Mind #

• Unity Version: Stick to Unity 2020.3 LTS or newer—older versions lack native framework export support, and manual packaging is way more hassle.
• Bundle ID Match: Your Unity project’s bundle ID must exactly match the one you use when calling setDataBundleId in Swift. Mismatches will cause Unity to fail to initialize.
• Memory Management: Unity frameworks are resource-heavy. Make sure to properly initialize and clean up the framework (like calling unload when you’re done with it) to avoid memory leaks.
• Test Everywhere: Test on both simulators and real devices—IL2CPP builds can behave differently in each environment, and some Unity features only work on physical hardware.

内容的提问来源于stack exchange，提问作者Yi Jiang