通过 UDP 发送命令的 SwiftUI 代码
我想要的是
我需要设置这个：
var hostUDP: NWEndpoint.Host = "192.168.0.205" //Line I want to fill with dispositive.ip
var portUDP: NWEndpoint.Port = 3489 //Line I want to fill with dispositive.port
到决定性结构中的价值观。我知道我不能在视图之外执行此操作，但我也无法在视图内部执行此操作。
错误
Cannot convert value of type 'String' to specified type 'NWEndpoint.Host'
在线var IP: NWEndpoint.Host = dispositive.ip
代码
这是我的代码：
import SwiftUI
import Foundation
import Network
var connection: NWConnection?
var hostUDP: NWEndpoint.Host = "192.168.0.205"
var portUDP: NWEndpoint.Port = 3489
struct CommunicationsView: View {
var dispositive: Dispositive
@State var confirm = false
@State var command: String = ""
var body: some View {
VStack {
HStack{
VStack{
HStack{
Button(action: {
var IP: NWEndpoint.Host = dispositive.ip
self.connectToUDP(hostUDP, portUDP, message:"<ARRIBA1>")
}) {
Text("Y+")
}
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
HStack{
Button(action: {
self.connectToUDP(hostUDP, portUDP, message:"<IZQUIERDA1>")
}) {
Text("X-")
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
Button(action: {
self.connectToUDP(hostUDP, portUDP, message:"<PARAR>")
}) {
Text("STOP")
.font(.subheadline)
.bold()
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
Button(action: {
self.connectToUDP(hostUDP, portUDP, message:"<DERECHA1>")
}) {
Text("X+")
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
}
HStack{
Button(action: {
self.connectToUDP(hostUDP, portUDP, message:"<ABAJO1>")
}) {
Text("Y-")
}
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
}
.padding()
Divider()
.padding()
.frame(height: 200)
VStack{
HStack{
Button(action: {
self.connectToUDP(hostUDP, portUDP, message:"<SUBIR>")
}) {
Text("Z+")
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
}
HStack{
Button(action: {
self.connectToUDP(hostUDP, portUDP, message:"<BAJAR>")
}) {
Text("Z-")
}
.padding()
.background(
Capsule()
.stroke(Color.blue, lineWidth: 1.5)
)
}
}
.padding()
}
VStack(alignment: .leading) {
Text("Terminal input")
.font(.callout)
.bold()
HStack{
TextField("Enter new command to send...", text: $command)
.textFieldStyle(RoundedBorderTextFieldStyle())
Button(action: {
self.confirm = true
}) {
Text("Enviar")
}
.actionSheet(isPresented: $confirm){
ActionSheet(
title: Text("Send custom message"),
message: Text("Are you Sure?"),
buttons: [
.cancel(Text("Cancel")),
.destructive(Text("Yes"), action: {
print("Sound the Alarm")
self.connectToUDP(hostUDP, portUDP, message:command)
})
]
)
}
}
}.padding()
}
}
func connectToUDP(_ hostUDP: NWEndpoint.Host, _ portUDP: NWEndpoint.Port, message: String) {
// Transmited message:
let messageToUDP = message
connection = NWConnection(host: hostUDP, port: portUDP, using: .udp)
connection?.stateUpdateHandler = { (newState) in
print("This is stateUpdateHandler:")
switch (newState) {
case .ready:
print("State: Ready\n")
self.sendUDP(messageToUDP)
self.receiveUDP()
case .setup:
print("State: Setup\n")
case .cancelled:
print("State: Cancelled\n")
case .preparing:
print("State: Preparing\n")
default:
print("ERROR! State not defined!\n")
}
}
connection?.start(queue: .global())
}
func sendUDP(_ content: String) {
let contentToSendUDP = content.data(using: String.Encoding.utf8)
connection?.send(content: contentToSendUDP, completion: NWConnection.SendCompletion.contentProcessed(({ (NWError) in
if (NWError == nil) {
print("Data was sent to UDP")
} else {
print("ERROR! Error when data (Type: Data) sending. NWError: \n \(NWError!)")
}
})))
}
func receiveUDP() {
connection?.receiveMessage { (data, context, isComplete, error) in
if (isComplete) {
print("Receive is complete")
if (data != nil) {
let backToString = String(decoding: data!, as: UTF8.self)
print("Received message: \(backToString)")
} else {
print("Data == nil")
}
}
}
}
}
struct CommunicationsView_Previews: PreviewProvider {
static var previews: some View {
CommunicationsView(dispositive: Dispositive(id: 1, name: "Nombre", description: "Descripción", color: .blue, banner: Image(""), ip: "192.168.0.84", port: 8888, control: 1, avatar: Image("user"), favorite: true)).previewLayout(.fixed(width: 400, height: 320))
}
}
决定性的
决定性结构：
struct Dispositive {
var id: Int
var name: String
var description: String
var color: Color
var banner: Image
var ip: String
var port: Int
var control: Int
var avatar: Image
var favorite: Bool
}