iOS Swift 使用 Firebase 云消息发送丰富的推送通知

Posted 2023-02-24

【中文标题】iOS Swift 使用 Firebase 云消息发送丰富的推送通知

【英文标题】：iOS Swift Send Rich Push Notification Using Firebase Cloud Messaging

【发布时间】：2020-07-06 17:59:44

【问题描述】：

我无法让 Firebase 推送通知使用图像来工作。我通过 FCM 接口发送有效载荷。当我使用图像链接填写“通知图像”字段时，在我的设备上进行测试时图像无法通过。

推送通知已成功发送到我的手机，但图像从未出现。

我已经设置了通知服务扩展。非常感谢任何帮助。

import UserNotifications
import FirebaseMessaging
import Foundation

class NotificationService: UNNotificationServiceExtension 

var contentHandler: ((UNNotificationContent) -> Void)?
var bestAttemptContent: UNMutableNotificationContent?

override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) 
    self.contentHandler = contentHandler
    bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
    
    guard let bestAttemptContent = bestAttemptContent,
        let attachmentUrlAsString = bestAttemptContent.userInfo["url"] as? String,
        let attachmentUrl = URL(string: attachmentUrlAsString) else 
            return
    
    let mediaInfo = bestAttemptContent.userInfo
    Messaging.serviceExtension().populateNotificationContent(bestAttemptContent, withContentHandler: contentHandler)
    print("media info for push is: \(mediaInfo)")
    downloadImageFrom(url: attachmentUrl)  (attachment) in
        if let attachment = attachment 
            bestAttemptContent.attachments = [attachment]
            contentHandler(bestAttemptContent)
            Messaging.serviceExtension().populateNotificationContent(bestAttemptContent, withContentHandler: contentHandler)
        
    


override func serviceExtensionTimeWillExpire() 
    // Called just before the extension will be terminated by the system.
    // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
    if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent 
        contentHandler(bestAttemptContent)
    




extension NotificationService 
private func downloadImageFrom(url: URL, with completionHandler: @escaping (UNNotificationAttachment?) -> Void)
    let task = URLSession.shared.downloadTask(with: url)  (downloadedUrl, response, error) in
        //1. Test url and escape if url has problem
        guard let downloadedUrl = downloadedUrl else 
            completionHandler(nil)
            return
        
        
        //2.
        var urlPath = URL(fileURLWithPath: NSTemporaryDirectory())
        let uniqueUrlEnding = ProcessInfo.processInfo.globallyUniqueString + ".jpg"
        urlPath = urlPath.appendingPathComponent(uniqueUrlEnding)
        
        try? FileManager.default.moveItem(at: downloadedUrl, to: urlPath)
        
        do 
            let attachment = try UNNotificationAttachment(identifier: "picture", url: urlPath, options: nil)
            completionHandler(attachment)
         catch 
            completionHandler(nil)
        
        
    
    task.resume()

【问题讨论】：

请显示您发送到 fcm 的有效负载

有效载荷必须与firebase documentation中指示的相同

我通过 FCM 添加了我的推送设置的屏幕截图。

【参考方案1】：

我是这样解决的，应用于 Firebase：

    guard let bestAttemptContent = bestAttemptContent,
        let fcmOptions = bestAttemptContent.userInfo["fcm_options"] as? [String: Any],
        let attachmentUrlAsString = fcmOptions["image"] as? String,
        let attachmentUrl = URL(string: attachmentUrlAsString) else 
            return