抽空整理了一下推送相关，iOS推送的原理网上一大摞，在这就不再赘述了，这里整理了一下包括注册、注册成功与否的回调，推送前后台的展示与点击回调方法。（swift版本）

一、推送注册

在AppDelegate中的方法 application(_ application: UIApplication, didFinishLaunchingWithOptions中进行注册。
示例代码：

        //注册推送通知
        if #available(iOS 10.0, *) {
            let notifCenter = UNUserNotificationCenter.current()
            notifCenter.delegate = self
            notifCenter.requestAuthorization(options: [.alert, .badge, .sound]) { (registered, error) in
                #if DEBUG
                if registered {
                    print("notification authorization granted")
                } else {
                    print("notification authorization not granted,\nerror: \(String(describing: error))")
                }
                #endif
            }
            // 实现代理的方法, 接收到通知会调用.
        } else {
            let settings: UIUserNotificationSettings = UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            UIApplication.shared.registerUserNotificationSettings(settings)
        }
        UIApplication.shared.registerForRemoteNotifications()

        // 获取远程推送消息 iOS 10 已取消
        let notification = launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] as? [AnyHashable: Any]
        // 如果remote不为空，就代表应用在未打开的时候收到了推送消息
        if notification != nil {
            // 收到推送消息实现的方法
            UIApplication.shared.applicationIconBadgeNumber = 0
            self.gotoViewControllerWithType(userInfo: notification!)
        }

二、推送注册成功、失败回调

注册成功后将token上报给服务器，失败则显示alert（根据需求）。
示例代码：

//推送注册成功
    func application(_ application: UIApplication,didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let tokenParts = deviceToken.map { data -> String in
            return String(format: "%02.2hhx", data)
        }
        let token = tokenParts.joined()
#if DEBUG
        print("Device Token: \(token)")
#endif
        //上报服务器token
        self.reportToken(token: token)
    }
    //推送注册失败
    func application(_ application: UIApplication,didFailToRegisterForRemoteNotificationsWithError error: Error) {
//        print("registerError:\(error.localizedDescription)")
        //展示alert        
        let alertVc = UIAlertController(title: nil, message: error.localizedDescription, preferredStyle: .alert)
        let action = UIAlertAction(title: "OK", style: .cancel, handler: nil)
        alertVc.addAction(action)
        self.window?.rootViewController?.present(alertVc, animated: true, completion: nil)
    }

三、收到通知的展示和点击

首先在APP未启动（被杀死）时，收到通知APP是无法回调的，然后具体的通知回调参考下图极光推送回调。

通知回调.png

示例代码：

//接受通知
    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        DDLogDebug("userInfo10:\(userInfo)")
        
        if UIApplication.shared.applicationState == .active {
        //应用在前台         
        }else{
            //推送后的动作
            self.gotoViewControllerWithType(userInfo: userInfo)
        }
    }
    //10.0之前展示、点击代理，iOS10.0之后展示代理
    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler handler: @escaping (UIBackgroundFetchResult) -> Void) {
//        mxPrint("Notification received: \(userInfo)")
        
        let extra = userInfo[AnyHashable("extra")] as! [AnyHashable: Any]
        let type = extra[AnyHashable("type")] as! String
   
        if UIApplication.shared.applicationState == .active {

        }else{
            self.gotoViewControllerWithType(userInfo: userInfo)
        }
    }

先到这，有问题欢迎指正。