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Azure 通知中心富推送

项目
06/01/2023

概述

为了吸引用户使用即时丰富内容，除纯文本之外，应用程序可能还需要以其他形式进行推送。这些通知将提升用户交互并显示 URL、声音、映像/优惠券等内容。本教程以通知用户教程为基础，演示如何发送包含有效负载（例如映像）的推送通知。

本教程适用于 iOS 7 和 8。

三张屏幕截图：带有“发送推送”按钮的应用屏幕、设备上的开始屏幕以及带有“后退”按钮的 Windows 徽标。

在高级别中：

应用后端：
- 在后端数据库/本地存储中存储富有效负载（在本例中为映像）。
- 向设备发送此富通知的 ID。
设备上的应用：
- 与使用设备接收到的 ID 请求富有效负载的后端进行联系。
- 在数据检索完成后，向用户设备发送通知，并在用户点击“了解详细信息”时立即显示有效负载。

WebAPI 项目

在 Visual Studio 中，打开在通知用户教程中创建的 AppBackend 项目。
获取用于通知用户的映像，并将其置于项目目录的 img 文件夹中。
单击“解决方案资源管理器”中的“显示所有文件”，右键单击该文件夹以“包括在项目中”。
通过选定的映像，将“属性”窗口中的“生成操作”更改为“嵌入的资源” 。
在 Notifications.cs中，添加以下 using 语句：
```
using System.Reflection;
```

将 Notifications 类替换为以下代码。请确保将占位符替换为通知中心凭据和映像文件名：

public class Notification {
    public int Id { get; set; }
    // Initial notification message to display to users
    public string Message { get; set; }
    // Type of rich payload (developer-defined)
    public string RichType { get; set; }
    public string Payload { get; set; }
    public bool Read { get; set; }
}

public class Notifications {
    public static Notifications Instance = new Notifications();

    private List<Notification> notifications = new List<Notification>();

    public NotificationHubClient Hub { get; set; }

    private Notifications() {
        // Placeholders: replace with the connection string (with full access) for your notification hub and the hub name from the Azure Classics Portal
        Hub = NotificationHubClient.CreateClientFromConnectionString("{conn string with full access}",  "{hub name}");
    }

    public Notification CreateNotification(string message, string richType, string payload) {
        var notification = new Notification() {
            Id = notifications.Count,
            Message = message,
            RichType = richType,
            Payload = payload,
            Read = false
        };

        notifications.Add(notification);

        return notification;
    }

    public Stream ReadImage(int id) {
        var assembly = Assembly.GetExecutingAssembly();
        // Placeholder: image file name (for example, logo.png).
        return assembly.GetManifestResourceStream("AppBackend.img.{logo.png}");
    }
}

在 NotificationsController.cs 中，使用以下代码重新定义 NotificationsController。这会将初始无提示的富通知 ID 发送到设备，并允许客户端对映像进行检索：

// Return http response with image binary
public HttpResponseMessage Get(int id) {
    var stream = Notifications.Instance.ReadImage(id);

    var result = new HttpResponseMessage(HttpStatusCode.OK);
    result.Content = new StreamContent(stream);
    // Switch in your image extension for "png"
    result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("image/{png}");

    return result;
}

// Create rich notification and send initial silent notification (containing id) to client
public async Task<HttpResponseMessage> Post() {
    // Replace the placeholder with image file name
    var richNotificationInTheBackend = Notifications.Instance.CreateNotification("Check this image out!", "img",  "{logo.png}");

    var usernameTag = "username:" + HttpContext.Current.User.Identity.Name;

    // Silent notification with content available
    var aboutUser = "{\"aps\": {\"content-available\": 1, \"sound\":\"\"}, \"richId\": \"" + richNotificationInTheBackend.Id.ToString() + "\",  \"richMessage\": \"" + richNotificationInTheBackend.Message + "\", \"richType\": \"" + richNotificationInTheBackend.RichType + "\"}";

    // Send notification to apns
    await Notifications.Instance.Hub.SendAppleNativeNotificationAsync(aboutUser, usernameTag);

    return Request.CreateResponse(HttpStatusCode.OK);
}

现在，将此应用重新部署到 Azure 网站，以便可以从所有设备对其进行访问。右键单击 AppBackend 项目，并选择“发布”。
选择 Azure 网站作为发布目标。使用 Azure 帐户登录，选择现有网站或新网站，并记下“连接”选项卡中的“目标 URL”属性。在本教程后面的部分中，我们将此 URL 称为“后端终结点”。选择“发布”。

修改 iOS 项目

现在，已将应用后端修改为只发送通知的 ID，更改 iOS 应用以处理该 ID，并从后端检索富消息：

打开 iOS 项目，并转到“目标”部分的主应用目标来启用远程通知。
选择“功能”，启用“背景模式”，并选中“远程通知”复选框。
打开 Main.storyboard，并确保具有通知用户教程中的视图控制器（本教程中称为“主页视图控制器”）。
将“导航控制器”添加到情节提要，并按住 Ctrl 键并拖动“主页视图控制器”，使其成为导航的根视图。请确保只选中“导航控制器”的“属性检查器”中的“是初始视图控制器”。
将视图控制器添加到情节提要并添加映像视图。用户单击此通知选择了解详细信息后，会看到此页面。 Storyboard 应类似于：
单击情节提要中的“主页视图控制器”，并确保它将 homeViewController 作为其“自定义类”和标识检查器下方的“情节提要 ID” 。
为映像视图控制器执行同样的操作，确保 imageViewController 充当相应的内容。
然后，新建名为 imageViewController 的视图控制器类来处理刚才创建的 UI。
在 imageViewController.h 中，将以下代码添加到控制器的接口声明中。请务必按住 Ctrl 键并从情节提要图像视图拖动到这些属性中，以链接两者：
```
@property (weak, nonatomic) IBOutlet UIImageView *myImage;
@property (strong) UIImage* imagePayload;
```

在 imageViewController.m 中，在 viewDidload 的末尾添加以下内容：

// Display the UI Image in UI Image View
[self.myImage setImage:self.imagePayload];

在 AppDelegate.m 中，导入已创建的映像控制器：
```
#import "imageViewController.h"
```

使用以下声明添加接口部分：

@interface AppDelegate ()

@property UIImage* imagePayload;
@property NSDictionary* userInfo;
@property BOOL iOS8;

// Obtain content from backend with notification id
- (void)retrieveRichImageWithId:(int)richId completion: (void(^)(NSError*)) completion;

// Redirect to Image View Controller after notification interaction
- (void)redirectToImageViewWithImage: (UIImage *)img;

@end

在 AppDelegate 中，确保应用在 application: didFinishLaunchingWithOptions 中注册了无提示通知：

// Software version
self.iOS8 = [[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)] && [[UIApplication sharedApplication] respondsToSelector:@selector(registerForRemoteNotifications)];

// Register for remote notifications for iOS8 and previous versions
if (self.iOS8) {
    NSLog(@"This device is running with iOS8.");

    // Action
    UIMutableUserNotificationAction *richPushAction = [[UIMutableUserNotificationAction alloc] init];
    richPushAction.identifier = @"richPushMore";
    richPushAction.activationMode = UIUserNotificationActivationModeForeground;
    richPushAction.authenticationRequired = NO;
    richPushAction.title = @"More";

    // Notification category
    UIMutableUserNotificationCategory* richPushCategory = [[UIMutableUserNotificationCategory alloc] init];
    richPushCategory.identifier = @"richPush";
    [richPushCategory setActions:@[richPushAction] forContext:UIUserNotificationActionContextDefault];

    // Notification categories
    NSSet* richPushCategories = [NSSet setWithObjects:richPushCategory, nil];

    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeSound |
                                            UIUserNotificationTypeAlert |
                                            UIUserNotificationTypeBadge
                                                                                categories:richPushCategories];

    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    [[UIApplication sharedApplication] registerForRemoteNotifications];

}
else {
    // Previous iOS versions
    NSLog(@"This device is running with iOS7 or earlier versions.");

    [[UIApplication sharedApplication] registerForRemoteNotificationTypes: UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeNewsstandContentAvailability];
}

return YES;

将以下实现替换为 application:didRegisterForRemoteNotificationsWithDeviceToken 以考虑情节提要 UI 更改情况：

// Access navigation controller which is at the root of window
UINavigationController *nc = (UINavigationController *)self.window.rootViewController;
// Get home view controller from stack on navigation controller
homeViewController *hvc = (homeViewController *)[nc.viewControllers objectAtIndex:0];
hvc.deviceToken = deviceToken;

然后，将以下方法添加到 AppDelegate.m，以从终结点检索映像，并在检索完成后发送本地通知。请确保将占位符 {backend endpoint} 替换为后端终结点：

NSString *const GetNotificationEndpoint = @"{backend endpoint}/api/notifications";

// Helper: retrieve notification content from backend with rich notification id
- (void)retrieveRichImageWithId:(int)richId completion: (void(^)(NSError*)) completion {
    UINavigationController *nc = (UINavigationController *)self.window.rootViewController;
    homeViewController *hvc = (homeViewController *)[nc.viewControllers objectAtIndex:0];
    NSString* authenticationHeader = hvc.registerClient.authenticationHeader;
    // Check if authenticated
    if (!authenticationHeader) return;

    NSURLSession* session = [NSURLSession
                            sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]
                            delegate:nil
                            delegateQueue:nil];

    NSURL* requestURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@/%d", GetNotificationEndpoint, richId]];
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:requestURL];
    [request setHTTPMethod:@"GET"];
    NSString* authorizationHeaderValue = [NSString stringWithFormat:@"Basic %@", authenticationHeader];
    [request setValue:authorizationHeaderValue forHTTPHeaderField:@"Authorization"];

    NSURLSessionDataTask* dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

        NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*) response;
        if (!error && httpResponse.statusCode == 200) {
            // From NSData to UIImage
            self.imagePayload = [UIImage imageWithData:data];

            completion(nil);
        }
        else {
            NSLog(@"Error status: %ld, request: %@", (long)httpResponse.statusCode, error);
            if (error)
                completion(error);
            else {
                completion([NSError errorWithDomain:@"APICall" code:httpResponse.statusCode userInfo:nil]);
            }
        }
    }];
    [dataTask resume];
}

// Handle silent push notifications when id is sent from backend
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))handler {
    self.userInfo = userInfo;
    int richId = [[self.userInfo objectForKey:@"richId"] intValue];
    NSString* richType = [self.userInfo objectForKey:@"richType"];

    // Retrieve image data
    if ([richType isEqualToString:@"img"]) {  
        [self retrieveRichImageWithId:richId completion:^(NSError* error) {
            if (!error){
                // Send local notification
                UILocalNotification* localNotification = [[UILocalNotification alloc] init];

                // "5" is arbitrary here to give you enough time to quit out of the app and receive push notifications
                localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:5];
                localNotification.userInfo = self.userInfo;
                localNotification.alertBody = [self.userInfo objectForKey:@"richMessage"];
                localNotification.timeZone = [NSTimeZone defaultTimeZone];

                // iOS8 categories
                if (self.iOS8) {
                    localNotification.category = @"richPush";
                }

                [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

                handler(UIBackgroundFetchResultNewData);
            }
            else{
                handler(UIBackgroundFetchResultFailed);
            }
        }];
    }
    // Add "else if" here to handle more types of rich content such as url, sound files, etc.
}

使用以下方法打开 AppDelegate.m 中的映像视图控制器，处理先前的本地通知：

// Helper: redirect users to image view controller
- (void)redirectToImageViewWithImage: (UIImage *)img {
    UINavigationController *navigationController = (UINavigationController*) self.window.rootViewController;
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
    imageViewController *imgViewController = [mainStoryboard instantiateViewControllerWithIdentifier: @"imageViewController"];
    // Pass data/image to image view controller
    imgViewController.imagePayload = img;

    // Redirect
    [navigationController pushViewController:imgViewController animated:YES];
}

// Handle local notification sent above in didReceiveRemoteNotification
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
    if (application.applicationState == UIApplicationStateActive) {
        // Show in-app alert with an extra "more" button
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Notification" message:notification.alertBody delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"More", nil];
        [alert show];
    }
    // App becomes active from user's tap on notification
    else {
        [self redirectToImageViewWithImage:self.imagePayload];
    }
}

// Handle buttons in in-app alerts and redirect with data/image
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    // Handle "more" button
    if (buttonIndex == 1)
    {
        [self redirectToImageViewWithImage:self.imagePayload];
    }
    // Add "else if" here to handle more buttons
}

// Handle notification setting actions in iOS8
- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forLocalNotification:(UILocalNotification *)notification completionHandler:(void (^)())completionHandler {
    // Handle richPush related buttons
    if ([identifier isEqualToString:@"richPushMore"]) {
        [self redirectToImageViewWithImage:self.imagePayload];
    }
    completionHandler();
}

运行应用程序

在 XCode 中，在物理 iOS 设备上运行此应用（推送通知将无法在模拟器中正常工作）。
在 iOS 应用 UI 中，输入相同值的用户名和密码进行身份验证，并单击“登录”。
单击“发送推送”，应看到应用内警报。如果单击“详细信息”，会转到选择要包括在应用后端中的映像。
也可以单击“发送推送”并立即按下设备的主页按钮。几分钟后会收到推送通知。如果点击推送通知或单击“详细信息”，会转到应用和富图像内容。

通过

Azure 通知中心富推送

概述

WebAPI 项目

修改 iOS 项目

运行应用程序

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