关于apple push notification services 的总结

准备

• 需要苹果开发者账号
• 激活Apple push notification capbilities
• 一台真机iPhone
• 一个发送端，可以是服务器端，也可以是客户端如pusher（https://github.com/noodlewerk/NWPusher）

开始代码准备

首先需要在项目的APPDelegate.swift 中导入 UserNotifications framework （UserNotifications framework 是Apple 在 iOS 10 以后 推出的全新的推送框架提供全新的API和功能 关于UserNotifications 可以参考UserNotifications | Apple Developer Documentation）

step 1 ：

导入UserNotifications 框架

import UserNotifications

step 2:

获取用户权限

封装一个方法 registerForPushNotifications（） 处理用户权限的获取

func registerForPushNotifications() {
  UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
    (granted, error) in
    print("Permission granted: \(granted)")

    guard granted else { return }
    self.getNotificationSettings()
  }
}

  func getNotificationSettings() {
    UNUserNotificationCenter.current().getNotificationSettings { (settings) in
      print("Notification settings: \(settings)")
      guard settings.authorizationStatus == .authorized else { return }
      UIApplication.shared.registerForRemoteNotifications()
    }
  }

在application(_:didFinishLaunchingWithOptions:) 调用我们封装好的registerForPushNotifications（）
registerForRemoteNotifications()方法 也就是为该设备注册通知服务，并且在注册成功后调用application(_:didRegisterForRemoteNotificationsWithDeviceToken:)

step 3: 处理通知服务注册接结果

func application(_ application: UIApplication,
                 didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
  let tokenParts = deviceToken.map { data -> String in
    return String(format: "%02.2hhx", data)
  }
  
  let token = tokenParts.joined()
  print("Device Token: \(token)")
}

func application(_ application: UIApplication,
                 didFailToRegisterForRemoteNotificationsWithError error: Error) {
  print("Failed to register: \(error)")
}

application(_:didRegisterForRemoteNotificationsWithDeviceToken:) 中如果使用自己的服务器后台或者第三方的推送服务，在这里上传DeviceToken给服务端（provider）

最后需要在Apple 开发者管理后台配置一下开发环境和生产环境的推送证书，如果有需要要把推送证书导出给provider

处理远程通知

UNUserNotificationCenterDelegate 是UserNotifications处理通知的代理方法；设置代理：

  func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    
    UNUserNotificationCenter.current().delegate = self
    
        registerForPushNotifications()

    return true
  }

实现代理方法：

optional public func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Swift.Void)

如下：

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

参考

• Local and Remote Notification Programming Guide: APNs Overview
• Push Notifications Tutorial: Getting Started
• An Introduction to the UserNotifications Framework
• iOS 推送通知 功能简单实现 -
• Local and Remote Notification Programming Guide: Communicating with APNs
• Establishing a Certificate-Based Connection to APNs | Apple Developer Documentation