在没有StoryBoard的情况下点击通知时访问特定的ViewController (以编程方式)

import UserNotifications

class NotificationHandler: NSObject, UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        // 获取通知的标识符
        let identifier = response.notification.request.identifier
        
        // 根据标识符判断需要打开的ViewController
        if identifier == "NotificationIdentifier" {
            let viewController = SpecificViewController()
            
            // 在这里可以进行一些其他的处理，例如传递参数等
            
            // 获取当前的window
            guard let window = UIApplication.shared.windows.first else {
                return
            }
            
            // 设置ViewController为rootViewController
            window.rootViewController = viewController
            window.makeKeyAndVisible()
        }
        
        // 完成处理
        completionHandler()
    }
}

import UIKit
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    let notificationHandler = NotificationHandler()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // 注册通知处理类
        UNUserNotificationCenter.current().delegate = notificationHandler
        
        // 请求用户授权通知
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
            // 处理授权结果
        }
        
        // 其他初始化操作
        
        return true
    }
    
    // 其他AppDelegate方法
}

import UserNotifications

func sendNotification() {
    let content = UNMutableNotificationContent()
    content.title = "通知标题"
    content.body = "通知内容"
    content.sound = UNNotificationSound.default
    content.badge = 1
    
    // 设置通知的identifier为特定的值
    let request = UNNotificationRequest(identifier: "NotificationIdentifier", content: content, trigger: nil)
    
    // 发送通知
    UNUserNotificationCenter.current().add(request) { (error) in
        // 处理发送结果
    }
}