【SwiftでUnityを使う】Unity as a Library入門

// [!] important set UnityFramework in Target Membership for this file
// [!]           and set Public header visibility

#import <Foundation/Foundation.h>

// NativeCallsProtocol defines protocol with methods you want to be called from managed
@protocol NativeCallsProtocol
@required
- (void) showHostMainWindow:(NSString*)color;
// other methods
@end

__attribute__ ((visibility("default")))
@interface FrameworkLibAPI : NSObject
// call it any time after UnityFrameworkLoad to set object implementing NativeCallsProtocol methods
+(void) registerAPIforNativeCalls:(id<NativeCallsProtocol>) aApi;

@end

#import <Foundation/Foundation.h>
#import "NativeCallProxy.h"

@implementation FrameworkLibAPI

id<NativeCallsProtocol> api = NULL;
+(void) registerAPIforNativeCalls:(id<NativeCallsProtocol>) aApi
{
    api = aApi;
}

@end

extern "C" {
    void showHostMainWindow(const char* color) { return [api showHostMainWindow:[NSString stringWithUTF8String:color]]; }
}

#include <UnityFramework/NativeCallProxy.h>

import Foundation
import UnityFramework

class Unity: NSObject, UnityFrameworkListener, NativeCallsProtocol {
    static let shared = Unity()
    private let unityFramework: UnityFramework

    override init() {
        let bundlePath = Bundle.main.bundlePath
        let frameworkPath = bundlePath + "/Frameworks/UnityFramework.framework"
        let bundle = Bundle(path: frameworkPath)!
        if !bundle.isLoaded {
            bundle.load()
        }
        let frameworkClass = bundle.principalClass as! UnityFramework.Type
        let framework = frameworkClass.getInstance()!
        if framework.appController() == nil {
            var header = _mh_execute_header
            framework.setExecuteHeader(&header)
        }
        unityFramework = framework
        super.init()
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) {
        unityFramework.register(self)
        FrameworkLibAPI.registerAPIforNativeCalls(self)
        unityFramework.setDataBundleId("com.unity3d.framework")
        unityFramework.runEmbedded(withArgc: CommandLine.argc, argv: CommandLine.unsafeArgv, appLaunchOpts: launchOptions)
    }
    
    func start() {
        unityFramework.register(self)
        FrameworkLibAPI.registerAPIforNativeCalls(self)
        unityFramework.setDataBundleId("com.unity3d.framework")
        unityFramework.runEmbedded(withArgc: CommandLine.argc, argv: CommandLine.unsafeArgv, appLaunchOpts: nil)
    }

    var view: UIView {
        unityFramework.appController()!.rootView!
    }

    func showHostMainWindow(_ color: String!) {

    }
}

import SwiftUI

struct UnityView: UIViewRepresentable {
    func makeUIView(context: Context) -> some UIView {
        return Unity.shared.view
    }
    
    func updateUIView(_ uiView: UIViewType, context: Context) {
    }
}

import UIKit

final class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        Unity.shared.start()        
        return true
    }
}

import SwiftUI

@main
struct UaaLSampleApp: App {
    @UIApplicationDelegateAdaptor var appDelegate: AppDelegate // 👈追加
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

import SwiftUI

struct ContentView: View {
    var body: some View {
        UnityView()
    }
}