如何检测iOS App是否通过推送通知启动并获取通知数据？

核心原因 #

iOS 13及后续版本中，当App处于后台状态时，通过推送通知唤醒App不会触发AppDelegate的application(_:didFinishLaunchingWithOptions:)方法。这是因为苹果引入了Scene架构，App的启动/唤醒逻辑被转移到SceneDelegate的对应方法中。

解决方案 #

1. 适配Scene架构（iOS 13+）

如果项目使用SceneDelegate，需在scene(_:willConnectTo:options:)中处理推送参数：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    FirebaseApp.configure()
    
    // 处理从推送唤醒的场景
    if let notificationResponse = connectionOptions.notificationResponse {
        handleNotificationResponse(notificationResponse)
    } else if let launchNotification = connectionOptions.userInfo?[UIApplication.LaunchOptionsKey.remoteNotification.rawValue] as? [String: Any] {
        handleRemoteNotificationPayload(launchNotification)
    }
    
    guard let _ = (scene as? UIWindowScene) else { return }
}

// 自定义推送处理方法
private func handleNotificationResponse(_ response: UNNotificationResponse) {
    let payload = response.notification.request.content.userInfo
    // 在这里编写你的data payload业务逻辑
}

private func handleRemoteNotificationPayload(_ payload: [String: Any]) {
    // 在这里编写推送data payload的处理逻辑
}

2. 兼容iOS 12及以下版本

若需支持iOS 12及更早版本，保留AppDelegate中的方法，但注意：只有App完全关闭（未在后台运行）时，点击推送才会触发application(_:didFinishLaunchingWithOptions:)，此时可从launchOptions中获取推送参数：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    FirebaseApp.configure()
    
    // 处理App完全关闭时点击推送的场景
    if let remoteNotification = launchOptions?[.remoteNotification] as? [String: Any] {
        handleRemoteNotificationPayload(remoteNotification)
    }
    return true
}

// 实现后台推送接收方法
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    handleRemoteNotificationPayload(userInfo)
    completionHandler(.newData)
}

3. Firebase Messaging补充配置

确保正确实现Firebase的推送回调，在MessagingDelegate中处理消息：

// AppDelegate中设置代理（兼容iOS12及以下）
extension AppDelegate: MessagingDelegate {
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
        // 处理FCM Token逻辑
    }
}

// SceneDelegate中设置代理（iOS13+）
extension SceneDelegate: MessagingDelegate {
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
        // 处理FCM Token逻辑
    }
}

关键注意点 #

当App处于后台活跃（挂起）状态时，点击推送会触发UNUserNotificationCenterDelegate的userNotificationCenter(_:didReceive:withCompletionHandler:)方法，需实现该代理处理交互：

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    let payload = response.notification.request.content.userInfo
    // 编写推送交互后的业务逻辑
    completionHandler()
}

内容的提问来源于stack exchange，提问作者meds