我尝试在 iPhone 的后台显示 FCM 通知，但是当我使用 Swift 发送此通知时它不起作用

Question

我尝试在我的 iPhone 上在后台显示 Firebase Cloud Messaging 的通知，但是当我使用 Swift 发送此通知时它不起作用。

我在 Postman 中使用 HTTP 请求向我的 iPhone 发送了 FCM，这一切正常：我的 iPhone 在后台正确显示通知。

当我使用 Swift 发出相同的 HTTP 请求时，Firebase 的响应很好，但我的 iPhone 什么也不显示。

Postman 中有请求和响应： Postman's screenshot

在 Swift Playground 中也有同样的请求：

import Foundation

let key = "key=<my-server-key>"
let singleMessageUrl = "https://fcm.googleapis.com/fcm/send"

func sendSingleMessage() {
    let params: [String: Any] = [
        "to": "<my-device-token>",
        "notificiation": [
            "title": "Push from my playground",
            "body": "Push from my playground !"
        ],
    ]
    guard let bodyNotif = try? JSONSerialization.data(withJSONObject: params, options: []) else {
        print("BAD NOTIF")
        return
    }
    guard let json = try? JSONSerialization.jsonObject(with: bodyNotif, options: []) as? [String: Any] else {
        print("BAD JSON")
        return
    }
    print("PARAMS REQUEST:\n", params)
    print("---------------------------")
    print("JSON REQUEST:\n", json)
    print("---------------------------")
    guard let url = URL(string: singleMessageUrl) else {
        print("BAD URL")
        return
    }
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.httpBody = bodyNotif
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    request.setValue(key, forHTTPHeaderField: "Authorization")
    URLSession.shared.dataTask(with: request) { (data, response, error) in
        if let error = error {
            print("ERROR", error.localizedDescription)
        }
        guard let response = response else { return }
        print("HEADERS RESPONSE:\n", response)
        print("---------------------------")
        guard let data = data else { return }
        guard let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else {
            print("BAD JSON RESPONSE")
            return
        }
        print("BODY RESPONSE:\n", json)
    }.resume()
}
sendSingleMessage()

当我启动上述请求时，控制台中的响应似乎正常：

PARAMS REQUEST:
 ["to": "<my-device-token>", "notificiation": ["title": "Push from my playground", "body": "Push from my playground !"]]
---------------------------
JSON REQUEST:
 ["to": <my-device-token>, "notificiation": {
    body = "Push from my playground !";
    title = "Push from my playground";
}]
---------------------------
HEADERS RESPONSE:
 <NSHTTPURLResponse: 0x7fcaf544c610> { URL: https://fcm.googleapis.com/fcm/send } { Status Code: 200, Headers {
    "Cache-Control" =     (
        "private, max-age=0"
    );
    "Content-Encoding" =     (
        gzip
    );
    "Content-Length" =     (
        138
    );
    "Content-Type" =     (
        "application/json; charset=UTF-8"
    );
    Date =     (
        "Sun, 05 Jan 2020 09:47:15 GMT"
    );
    Expires =     (
        "Sun, 05 Jan 2020 09:47:15 GMT"
    );
    Server =     (
        GSE
    );
    "alt-svc" =     (
        "quic=\":443\"; ma=2592000; v=\"46,43\",h3-Q050=\":443\"; ma=2592000,h3-Q049=\":443\"; ma=2592000,h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000"
    );
    "x-content-type-options" =     (
        nosniff
    );
    "x-frame-options" =     (
        SAMEORIGIN
    );
    "x-xss-protection" =     (
        "1; mode=block"
    );
} }
---------------------------
BODY RESPONSE:
 ["multicast_id": <the-multicast_id-send-by-FCM>, "results": <__NSSingleObjectArrayI 0x7ff55bd46aa0>(
{
    "message_id" = "<the-message_id-send-by-FCM>";
}
)
, "success": 1, "failure": 0, "canonical_ids": 0]

但不幸的是，我的 iPhone 没有收到这个 Swift 的请求，而它正确地收到了邮递员请求发送的通知。

Answer 1

我已在我的应用程序上检查了此代码 - 它 100% 有效。代码本身包含强制解包，并且是从 Postman 复制的，因此将来需要对其进行优化，但是如果添加设备令牌和服务器密钥，您可以快速检查它。此外，我测试了您的代码并发现了一个问题 - 您应该将 "notificiation" 更改为 "notification"。希望对您有所帮助。

class ViewController: UIViewController {

    var semaphore = DispatchSemaphore (value: 0)
    var request = URLRequest(url: URL(string: "https://fcm.googleapis.com/fcm/send")!,timeoutInterval: Double.infinity)

    override func viewDidLoad() {
        super.viewDidLoad()

        sendSingleMessage()
    }

    func sendSingleMessage() {

        let parameters = "{\n    \"to\" : \"<my-device-token>\", \n\n    \"notification\": {\n    \"body\": \"From Swift code message\"\n  }\n\n  }"
        let postData = parameters.data(using: .utf8)

        request.addValue("key=<my-server-key>", forHTTPHeaderField: "Authorization")
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")

        request.httpMethod = "POST"
        request.httpBody = postData

        let task = URLSession.shared.dataTask(with: request) { data, response, error in
            guard let data = data else {
                print(String(describing: error))
                return
            }
            print(String(data: data, encoding: .utf8)!)
            self.semaphore.signal()
        }

        task.resume()
        semaphore.wait()
    }

}