SwiftUI应用通知功能实现遇阻，寻求技术解决方案

一、请求通知权限 #

首先需要向用户申请通知权限，可在App启动时完成：

import UserNotifications
import SwiftUI

@main
struct NotificationDemoApp: App {
    init() {
        requestNotificationPermission()
    }
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
    
    private func requestNotificationPermission() {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
            if let error = error {
                print("权限请求失败: \(error.localizedDescription)")
            }
            if granted {
                print("通知权限已授予")
                DispatchQueue.main.async {
                    UIApplication.shared.registerForRemoteNotifications()
                }
            }
        }
    }
}

二、本地通知实现 #

通过按钮触发本地通知的示例：

struct ContentView: View {
    var body: some View {
        Button("触发10秒后通知") {
            scheduleLocalNotification()
        }
    }
    
    private func scheduleLocalNotification() {
        let content = UNMutableNotificationContent()
        content.title = "测试通知"
        content.body = "这是一条SwiftUI本地通知"
        content.sound = .default
        
        // 设置10秒后触发，不重复
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 10, repeats: false)
        let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
        
        UNUserNotificationCenter.current().add(request) { error in
            if let error = error {
                print("添加通知请求失败: \(error.localizedDescription)")
            }
        }
    }
}

三、远程推送通知配置（APNs） #

基础配置步骤 #

1. 在Apple开发者后台开启App的Push Notifications服务
2. 生成并配置推送证书或密钥，确保后端可以正常调用APNs接口

SwiftUI中处理推送回调 #

通过UIApplicationDelegateAdaptor适配推送代理：

class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    // 成功获取设备Token
    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
        print("设备Token: \(token)")
        // 将token发送至你的后端服务器
    }
    
    // 注册远程通知失败
    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("注册远程通知失败: \(error.localizedDescription)")
    }
    
    // App前台时显示通知
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .sound, .badge])
    }
    
    // 处理用户点击通知的操作
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        print("点击通知获取到的信息: \(userInfo)")
        completionHandler()
    }
}

// 在App结构体中关联代理
@main
struct NotificationDemoApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    init() {
        requestNotificationPermission()
        UNUserNotificationCenter.current().delegate = appDelegate
    }
    
    // 之前的requestNotificationPermission方法...
}

常见问题排查 #

• 检查系统设置中App的通知权限是否开启
• 本地通知在App前台时，必须实现willPresent回调才能弹出通知
• 远程推送需确保设备Token正确传递给后端，且后端使用的证书/密钥与App的Bundle ID匹配

内容的提问来源于stack exchange，提问作者lhy