如何在firebase的实时数据库中发送新消息的推送通知

如果其他用户在数据库推送令牌首先你需要访问与查询，然后使用AFNetworking您可以发送推送通知给其他用户，如下图所示：

let manager = AFHTTPRequestOperationManager() 
    manager.requestSerializer.setValue("key=yourServerKey", forHTTPHeaderField: "Authorization") 
    manager.requestSerializer.setValue("application/json", forHTTPHeaderField: "Content-Type") 
    let sendPushForChatUrl = "https://fcm.googleapis.com/fcm/send" 
    let to = otherUserPushToken as! String 
    let notification = notificationData as! [String: AnyObject] 
    let param = ["to":to, "content_available":true, "priority":"high", "notification":notification] as [String : Any] 
    manager.post(sendPushForChatUrl, 
       parameters: prepareObjects(param), 
       success: { (operation: AFHTTPRequestOperation?,responseObject: Any?) in 
        print("Suceess") 
        print(responseObject ?? "") 
      } , 
       failure: { (operation: AFHTTPRequestOperation?,error: Error?) in 
        print("Error: " + error!.localizedDescription) 
        print("Fail") 
    }) 

，并要求例子是：

{ 
    "to":"userPushToken", 
    "priority":"high", 
    "content_available": true, 
    "notification":{ 
     "notification-type":"chat", 
     "target":"Current User", 
     "title":"Current User has sent you a message", 
     "text": "hello1", 
     "badge": 5 //Badge you want to show on app icon 
    } 
} 

如果您想调试它，它也可以在postman上运行。

编辑：下面

在你的情况是你的工作代码：

@IBAction func sendPushTapped(_ sender: Any) { 
    let manager = AFHTTPSessionManager() 
    manager.requestSerializer = AFJSONRequestSerializer() 
    manager.responseSerializer = AFJSONResponseSerializer() 
    manager.requestSerializer.setValue("key=AIzaSyBpJPPYSkRKH6cpDV_bpe2NQiytvPTlTcw", forHTTPHeaderField: "Authorization") 
    manager.requestSerializer.setValue("application/json", forHTTPHeaderField: "Content-Type") 
    let fcmToken = "fkXo5yZvrKc:APA91bGxj2tJKWungvA4zyOUFBp5leUghd0wczDbZSkzImjZqRfSIgEFtKCQWZL0xEPZ3xfasfJdoX_JosX87VK7ioyap1fJJcTQ9rJzlC5ahwDktTnLGVqRg-wNZZw4TVvaCemEQFs2" 
    let sendPushForChatUrl = "https://fcm.googleapis.com/fcm/send" 
    let message = ["notification-type":"chat", "target":"Current User", "title": "Hello", "text": "msg!", "sound": "default", "badge": 5] as [String : Any] 
    let param = ["to":fcmToken, "priority":"high", "content_available": true, "notification":message] as [String : Any] 
    print("Push Url :", sendPushForChatUrl) 
    print("Push Parameters :", prepareObjects(param)) 
    manager.post(sendPushForChatUrl, parameters: prepareObjects(param), progress: { (NSProgress) in 
     print("Progress ::", NSProgress) 
    }, success: { (task:URLSessionDataTask, responseObject) -> Void in 
     print("Push response", responseObject ?? "") 
    }, failure: { (task:URLSessionDataTask?, error:Error) -> Void in 
     print("Failure: ",error.localizedDescription) 
    }) 
} 
func prepareObjects(_ dict : Dictionary<String, Any>) -> NSMutableDictionary 
{ 
    let dictParameters = NSMutableDictionary() 
    for (key, value) in dict 
    { 
     dictParameters.setValue(value as? AnyObject, forKey: key) 
    } 
    return dictParameters 
}