iOS 示例

1. 你将需要一个开发设备
2. 转到 Apple 开发人员帐户并创建启用推送通知的配置文件
3. 你将需要某种方式来通知你的手机（AWS，Azure ..等） 我们将在此处使用 AWS

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();

   //after typical Xamarin.Forms Init Stuff

   //variable to set-up the style of notifications you want, iOS supports 3 types

   var pushSettings = UIUserNotificationSettings.GetSettingsForTypes(
              UIUserNotificationType.Alert |
              UIUserNotificationType.Badge |
              UIUserNotificationType.Sound,
              null );  

       
        //both of these methods are in iOS, we have to override them and set them up
        //to allow push notifications

        app.RegisterUserNotificationSettings(pushSettings);  //pass the supported push notifications settings to register app in settings page

     
}

public override async void RegisteredForRemoteNotifications(UIApplication application, NSData token)
    {
        AmazonSimpleNotificationServiceClient snsClient = new AmazonSimpleNotificationServiceClient("your AWS credentials here");

        // This contains the registered push notification token stored on the phone. 
        var deviceToken = token.Description.Replace("<", "").Replace(">", "").Replace(" ", ""); 

        if (!string.IsNullOrEmpty(deviceToken))
        {
            //register with SNS to create an endpoint ARN, this means AWS can message your phone
            var response = await snsClient.CreatePlatformEndpointAsync(
            new CreatePlatformEndpointRequest
            {
                Token = deviceToken,
                PlatformApplicationArn = "yourARNwouldgohere" /* insert your platform application ARN here */
            });

            var endpoint = response.EndpointArn;

            //AWS lets you create topics, so use subscribe your app to a topic, so you can easily send out one push notification to all of your users
            var subscribeResponse = await snsClient.SubscribeAsync(new SubscribeRequest
            {
                TopicArn = "YourTopicARN here",
                Endpoint = endpoint,
                Protocol = "application"

            });

        }

    }