ios - 如何在 Swift iOS 中监听来自服务器的网络数据？
<p><p>我正在创建一个应用程序来测试 iOS 和 Swift 中的网络框架。但是如何创建代码以便我可以从服务器接收数据，就像一个监听器？我正在使用 UDP 连接。</p>
<p>我已经尝试过使用“receive”或“receiveMessage”方法，但我一直不知道如何收听。它只是在应用程序连接到服务器时接收数据，而不是在服务器发送到客户端应用程序时接收数据。</p>
<pre><code>//This is the receiveMessage approach from the client in Swift:
class UDPClient {
var connection: NWConnection
var queue: DispatchQueue
weak var controller: ViewController?
init() {
queue = DispatchQueue(label: "UDP Client Queue")
connection = NWConnection(host: "<secret>", port: 8888, using: .udp)
connection.stateUpdateHandler = { (newState) in
switch newState {
case .ready:
print("ready to send")
self?.sendInitialMessage()
case .failed(let error):
print("client faild with error: \(error)")
default:
break
}
}
connection.start(queue: queue)
}
func sendInitialMessage() {
let helloMessage = "hello from iPhone".data(using: .utf8)
connection.send(content: helloMessage, completion: .contentProcessed({ (error) in
if let error = error {
print("Send error: \(error)")
}
}))
connection.receiveMessage { (content, context, isComplete, error) in
if content != nil {
print("Got message")
let text = String(data: content!, encoding: .utf8)
print(text!)
}
}
}
func send(content: Data) {
connection.send(content: content, completion: .contentProcessed({ (error) in
if let error = error {
print("Send error: \(error)")
}
}))
}
}
//This is the server PHP code:
$socket = socket_create(AF_INET, SOCK_DGRAM, 0);
socket_bind($socket, "<secret>", 0000);
while (true) {
socket_recvfrom($socket, $buffer, 100, 0, $rip, $rport);
echo "Received ". $buffer. " from ". $rip . $rport . "\n";
socket_sendto($socket, "hi", 2, 0, $rip, $rport);
}
</code></pre>
<p>我希望应用程序在服务器通过监听套接字数据发送“hi”消息时打印“hi”。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>尝试实现其他 stateUpdateHandler 枚举案例，请参阅此处的文档
<a href="https://developer.apple.com/documentation/network/nwconnection/state" rel="noreferrer noopener nofollow">https://developer.apple.com/documentation/network/nwconnection/state</a> </p>
<p>如果您想拥有一个可靠的 UDP 网络库，而不仅仅是学习基础知识，您可以使用 CocoaAsyncSocket 而无需重新发明轮子:
<a href="https://github.com/robbiehanson/CocoaAsyncSocket" rel="noreferrer noopener nofollow">https://github.com/robbiehanson/CocoaAsyncSocket</a> </p></p>
<p style="font-size: 20px;">关于ios - 如何在 Swift iOS 中监听来自服务器的网络数据？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/54160429/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/54160429/
</a>
</p>
页:
[1]