我尝试在我的 iPhone 后台显示 FCM 通知，但当我使用 Swift 发送此通知时它不起作用

Question

我尝试在我的 iPhone 后台显示 Firebase 云消息传递的通知，但是当我使用 Swift 发送此通知时它不起作用。

我在 Postman 中通过 HTTP 请求向我的 iPhone 发送了一个 FCM，并且工作正常：我的 iPhone 在后台正确显示了通知。

当我使用 Swift 发出相同的 HTTP 请求时，Firebase 的响应正常，但我的 iPhone 没有显示任何内容。

Postman 中有请求和响应： Postman's screenshot

Swift 游乐场中有相同的请求：

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 没有收到此 Swift 的请求，但它正确收到了邮递员请求发送的通知。

Answer 1

我已经在我的应用程序上检查了这段代码 - 它 100% 有效。代码本身包含一个force unwrapping，是从Postman复制过来的，所以以后需要优化，但是如果加上device token和server key，可以快速查看。我还测试了您的代码并发现了一个问题 - 您应该将 "notificiation" 更改为 "notification"。希望对你有帮助。

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()
    }

}

我尝试在我的 iPhone 后台显示 FCM 通知，但当我使用 Swift 发送此通知时它不起作用

I try to display FCM notification in background on my iPhone but it doesn't work when I send this notification with Swift

iphone

push-notification

ios

swift

firebase-cloud-messaging