Snippet showing OneSignal User Model SDK initialization in Swift for Apple devices.

MyApp.swift

import SwiftUI
import DotEnv
import OneSignalFramework

@main
struct MyApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

class AppDelegate: UIResponder, UIApplicationDelegate, OSInAppMessageLifecycleListener {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
        let env = DotEnv(withFile: ".env")
        env.load()
     
        OneSignal.initialize(env.get("ONESIGNAL_APP_ID"), withLaunchOptions: launchOptions)
    
        return true
    }
}