我可以在不使用 Objective-C（纯 Swift）的情况下向 React Native 公开 Swift 函数吗？

Question

I wonder if I can expose my func navigateToLoginWidget to React Native. So that it can be triggered from RN.

I have managed to change the Objective-C template that comes with React Native to Swift like so:

 import Foundation import IBMCloudAppID import BMSCore import UIKit @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? var bridge: RCTBridge! func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { // initializing App ID SDK let region = AppID.REGION_SOMEWHERE let backendGUID = "MY_TENANT_ID_FROM_IBM" AppID.sharedInstance.initialize(tenantId: backendGUID, region: region) // Initializing React Native front-end with Swift instead of Obj-c template let jsCodeLocation: URL jsCodeLocation = RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index.js", fallbackResource:nil) let rootView = RCTRootView(bundleURL: jsCodeLocation, moduleName: "MY_PROJECT_NAME", initialProperties: nil, launchOptions: launchOptions) let rootViewController = UIViewController() rootViewController.view = rootView self.window = UIWindow(frame: UIScreen.main.bounds) self.window?.rootViewController = rootViewController self.window?.makeKeyAndVisible() return true } func application(_ application: UIApplication, open url: URL, options :[UIApplication.OpenURLOptionsKey : Any]) -> Bool { return AppID.sharedInstance.application(application, open: url, options: options) } func navigateToLoginWidget(_ sender : Any) { print("clicked") AppID.sharedInstance.loginWidget?.launch(delegate: SigninDelegate) } }

I would normally have this function in another module called SigninDelegate.swift, but I have included it in the same class for explanatory purposes.

Answer 1

According to the official documentation :

Swift doesn't have support for macros so exposing it to React Native requires a bit more setup but works relatively the same.

So yes, it is possible, but some setup is needed. Check the docs in the link above for the steps you need to follow to set it up.