[英]How do I create an AWS server that could recieve data continously from an IOS(swift) app?
[英]How do i listen for network data from the server in Swift iOS?
我正在创建一个应用程序,用于在iOS和Swift中测试网络框架。 但是,如何创建代码,以便可以像侦听器一样从服务器接收数据? 我正在使用UDP连接。
我已经尝试使用“ receive”或“ receiveMessage”方法,但是我无法弄清楚如何一直收听。 它仅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。
//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 = { [weak self] (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);
}
我希望应用程序在服务器通过侦听套接字数据发送“ hi”消息时打印“ hi”。
尝试实现其他stateUpdateHandler枚举实例,请参见此处的文档https://developer.apple.com/documentation/network/nwconnection/state
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,则可以使用CocoaAsyncSocket而不必重新发明轮子: https : //github.com/robbiehanson/CocoaAsyncSocket
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