ios - 如何使用 SwiftUI 打开通知操作的自定义 View ？

Question

我正在尝试获取打开自定义 View 的通知操作。我的通知基本上是新闻，我希望用户在点击“阅读通知”操作时转到显示简单文本的页面(出于这个问题的目的)。我已经尝试了很多教程，但它们都使用了一些现有的 View ，例如“imagePicker”，这些 View 已经默认启用了大量的东西，我不知道我需要添加到我的自定义 View 中才能完成这项工作的所有东西.像 UIViewControllerRepresentable、协调器或任何我可能需要的东西。

这是我处理通知的主要 swift 文件。(通知工作正常)文件末尾是 AppDelegate: UNUserNotificationCenterDelegate {} 的扩展名，该扩展名取 self 正在遵循的教程，它创建了一个 NewsItem，我也将在此处包含它。但由于我在 SwiftUI 而不是 UIKit 中工作，所以我无法按照我设法找到的任何教程来按照我想要的方式工作。

我包含了完整的应用程序委托(delegate)扩展和 newsItem 只是为了使代码可编译，但我将需要更改的部分放在注释 block 中。

import SwiftUI
import UserNotifications
enum Identifiers {
  static let viewAction = "VIEW_IDENTIFIER"
  static let readableCategory = "READABLE"
}
@main
struct MyApp: App {
  @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
  var body: some Scene {
    WindowGroup {
      TabView{  
        NavigationView{
          ContentView()
        }
        .tabItem {
          Label("Home", systemImage : "house")
        }
      }
    }
  }
}


class AppDelegate: NSObject, UIApplicationDelegate {
  var window: UIWindow?
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    UNUserNotificationCenter.current().delegate = self// set the delegate
    registerForPushNotifications()
    return true
  }
  func application(  // registers for notifications and gets token
    _ application: UIApplication,
    didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data
  ) {
    let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
    let token = tokenParts.joined()
    print("device token : \(token)")
  }//handles sucessful register for notifications
  
  func application( //handles unsucessful register for notifications
    _ application: UIApplication,
    didFailToRegisterForRemoteNotificationsWithError error: Error
  ) {
    print("Failed to register: \(error)")
  }//handles unsucessful register for notifications
  
  func application(   //handles notifications when app in foreground
    _ application: UIApplication,
    didReceiveRemoteNotification userInfo: [AnyHashable: Any],
    fetchCompletionHandler completionHandler:
      @escaping (UIBackgroundFetchResult) -> Void
  ) {
    guard let aps = userInfo["aps"] as? [String: AnyObject] else {
      completionHandler(.failed)
      return
    }
    print("new notification received")
  }//handles notifications when app in foreground
  
  func registerForPushNotifications() {
    UNUserNotificationCenter.current()
      .requestAuthorization(options: [.alert, .sound, .badge]) { [weak self] granted, _ in
        print("permission granted: \(granted)")
        guard granted else { return }
        let viewAction = UNNotificationAction(
          identifier: Identifiers.viewAction,
          title: "Mark as read",
          options: [.foreground])

        let readableNotification = UNNotificationCategory(
          identifier: Identifiers.readable,
          actions: [viewAction2],
          intentIdentifiers: [],
          options: [])
        UNUserNotificationCenter.current().setNotificationCategories([readableNotification])
        self?.getNotificationSettings()
      }
  }
  
  func getNotificationSettings() {
    UNUserNotificationCenter.current().getNotificationSettings { settings in
      guard settings.authorizationStatus == .authorized else { return }
      DispatchQueue.main.async {
        UIApplication.shared.registerForRemoteNotifications()
      }
      print("notification settings: \(settings)")
    }
  }
}

// MARK: - UNUserNotificationCenterDelegate

extension AppDelegate: UNUserNotificationCenterDelegate {
  func userNotificationCenter(
    _ center: UNUserNotificationCenter,
    didReceive response: UNNotificationResponse,
    withCompletionHandler completionHandler: @escaping () -> Void
  ) {
    let userInfo = response.notification.request.content.userInfo

    if let aps = userInfo["aps"] as? [String: AnyObject],
      let newsItem = NewsItem.makeNewsItem(aps) {
      (window?.rootViewController as? UITabBarController)?.selectedIndex = 1

      if response.actionIdentifier == Identifiers.viewAction,
        let url = URL(string: newsItem.link) {
        let safari = SFSafariViewController(url: url)
        window?.rootViewController?.present(safari, animated: true, completion: nil)
      }
    }

    completionHandler()
  }
}

// MARK: - UNUserNotificationCenterDelegate

extension AppDelegate: UNUserNotificationCenterDelegate {
  func userNotificationCenter(
    _ center: UNUserNotificationCenter,
    didReceive response: UNNotificationResponse,
    withCompletionHandler completionHandler: @escaping () -> Void
  ) {
    let userInfo = response.notification.request.content.userInfo

    if let aps = userInfo["aps"] as? [String: AnyObject],
      /*
      let newsItem = NewsItem.makeNewsItem(aps) {
      (window?.rootViewController as? UITabBarController)?.selectedIndex = 1
      if response.actionIdentifier == Identifiers.viewAction,
        let url = URL(string: newsItem.link) {
        let safari = SFSafariViewController(url: url)
        window?.rootViewController?.present(safari, animated: true, completion: nil)
      }
    }
   */

    completionHandler()
  }
}

这是教程中的 NewsItem.swift 以防万一，但这是一个我不需要或不想使用的文件。

import Foundation

struct NewsItem: Codable {
  let title: String
  let date: Date
  let link: String

  @discardableResult
  static func makeNewsItem(_ notification: [String: AnyObject]) -> NewsItem? {
    guard
      let news = notification["alert"] as? String,
      let url = notification["link_url"] as? String
    else {
      return nil
    }

    let newsItem = NewsItem(title: news, date: Date(), link: url)
    let newsStore = NewsStore.shared
    newsStore.add(item: newsItem)

    NotificationCenter.default.post(
      name: NewsFeedTableViewController.refreshNewsFeedNotification,
      object: self)

    return newsItem
  }
}

简化的 ContentView

import SwiftUI
struct ContentView: View {   
    var body: some View {
        VStack{  
            Text(DataForApp.welcomeText)
                .font(.title)
                .bold()
                .multilineTextAlignment(.center)
                .foregroundColor(.secondary)
                .shadow(radius: 8 )
        } .navigationTitle("My Mobile App")
    }
}

现在我的目标是使用此 MyView，一旦用户点击“标记为已读”操作，我希望显示此 View 。

import SwiftUI
struct MyView: View {
    var body: some View {
        Text("Notification text here")
    }
}

显然 MyView 不包含任何它需要的东西，但我不想在这里发布我尝试过的代码，因为我尝试了 200 种不同的东西，因为它们都不起作用，我意识到我什至没有接近正确的轨道。

Answer 1

我通过使用我创建的名为 NotificationManager 的 @ObservableObject 解决了这个问题——它存储了最新通知的文本(如果你愿意，你可以扩展它来存储一个数组)和 提供一个绑定(bind)来告诉应用程序是否根据是否有要显示的通知在堆栈中显示新 View 。

此 NotificationManager 必须是 ContentView 上的 @ObservedObject 才能正常工作，因为 ContentView 需要监视 currentNotificationText 状态的变化>，这是一个@Published 属性。

ContentView 有一个不可见的 NavigationLink(通过 .overlay 和 EmptyView)，它只在有通知的事件。

在 App Delegate 方法中，我只是将通知传递给一个简单的函数 handleNotification，该函数解析 aps 并将生成的 String 放入在 NotificationManager 中。您还可以使用更强大的功能轻松增强它，包括解析 aps

中的其他字段

import SwiftUI
import UserNotifications

//new class to store notification text and to tell the NavigationView to go to a new page
class NotificationManager : ObservableObject {
    @Published var currentNotificationText : String?
    
    var navigationBindingActive : Binding<Bool> {
        .init { () -> Bool in
            self.currentNotificationText != nil
        } set: { (newValue) in
            if !newValue { self.currentNotificationText = nil }
        }
        
    }
}

enum Identifiers {
    static let viewAction = "VIEW_IDENTIFIER"
    static let readableCategory = "READABLE"
}

@main
struct MyApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    var body: some Scene {
        WindowGroup {
            TabView{
                NavigationView{
                    ContentView(notificationManager: appDelegate.notificationManager) //pass the notificationManager as a dependency
                }
                .tabItem {
                    Label("Home", systemImage : "house")
                }
            }
        }
    }
}


class AppDelegate: NSObject, UIApplicationDelegate {
    var notificationManager = NotificationManager() //here's where notificationManager is stored
    
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        UNUserNotificationCenter.current().delegate = self// set the delegate
        registerForPushNotifications()
        return true
    }
    func application(  // registers for notifications and gets token
        _ application: UIApplication,
        didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data
    ) {
        let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
        let token = tokenParts.joined()
        print("device token : \(token)")
    }//handles sucessful register for notifications
    
    func application( //handles unsucessful register for notifications
        _ application: UIApplication,
        didFailToRegisterForRemoteNotificationsWithError error: Error
    ) {
        print("Failed to register: \(error)")
    }//handles unsucessful register for notifications
    
    func application(   //handles notifications when app in foreground
        _ application: UIApplication,
        didReceiveRemoteNotification userInfo: [AnyHashable: Any],
        fetchCompletionHandler completionHandler:
            @escaping (UIBackgroundFetchResult) -> Void
    ) {
        guard let aps = userInfo["aps"] as? [String: AnyObject] else {
            completionHandler(.failed)
            return
        }
        print("new notification received")
        handleNotification(aps: aps)
        completionHandler(.noData)
    }//handles notifications when app in foreground
    
    func registerForPushNotifications() {
        UNUserNotificationCenter.current()
            .requestAuthorization(options: [.alert, .sound, .badge]) { [weak self] granted, _ in
                print("permission granted: \(granted)")
                guard granted else { return }
                let viewAction = UNNotificationAction(
                    identifier: Identifiers.viewAction,
                    title: "Mark as read",
                    options: [.foreground])
                
                let readableNotification = UNNotificationCategory(
                    identifier: Identifiers.readableCategory,
                    actions: [viewAction],
                    intentIdentifiers: [],
                    options: [])
                UNUserNotificationCenter.current().setNotificationCategories([readableNotification])
                self?.getNotificationSettings()
            }
    }
    
    func getNotificationSettings() {
        UNUserNotificationCenter.current().getNotificationSettings { settings in
            guard settings.authorizationStatus == .authorized else { return }
            DispatchQueue.main.async {
                UIApplication.shared.registerForRemoteNotifications()
            }
            print("notification settings: \(settings)")
        }
    }
}

// MARK: - UNUserNotificationCenterDelegate

extension AppDelegate: UNUserNotificationCenterDelegate {
    func userNotificationCenter(
        _ center: UNUserNotificationCenter,
        didReceive response: UNNotificationResponse,
        withCompletionHandler completionHandler: @escaping () -> Void
    ) {
        let userInfo = response.notification.request.content.userInfo
        if let aps = userInfo["aps"] as? [String: AnyObject] {
            handleNotification(aps: aps)
        }
    }
}

extension AppDelegate {
    @discardableResult func handleNotification(aps: [String:Any]) -> Bool {

        guard let alert = aps["alert"] as? String else { //get the "alert" field
            return false
        }
        self.notificationManager.currentNotificationText = alert
        return true
    }
}

struct ContentView: View {
    @ObservedObject var notificationManager : NotificationManager
    
    var body: some View {
        VStack{
            Text("Welcome")
                .font(.title)
                .bold()
                .multilineTextAlignment(.center)
                .foregroundColor(.secondary)
                .shadow(radius: 8 )
        }
        .navigationTitle("My Mobile App")
        .overlay(NavigationLink(destination: MyView(text: notificationManager.currentNotificationText ?? ""), isActive: notificationManager.navigationBindingActive, label: {
            EmptyView()
        }))
    }
}

struct MyView: View {
    var text : String
    
    var body: some View {
        Text(text)
    }
}

(我不得不用你的问题中的原始代码修复一些拼写错误/编译错误，所以请确保如果你使用它，你直接复制和粘贴以获得正确的方法签名等.)