SwiftUI异步重定向输出，如控制台输出（实时）

Question

我是 SwiftUI 学习者。尝试在 MacOS 上运行一个简单的功能，该标准输出就像控制台一样在视图中显示。使用下面的代码，一旦执行完成，它就会在视图上打印输出。无论如何，我可以将输出重定向到实时查看吗？请帮我。提前致谢！

struct MainView : View {
    @State var Log : String = ""
    var body: some View {
        VStack {
            Form {
                Section {
                    Text("\(Log)")
                }
                .onAppear {
                    DispatchQueue.global(qos: .background).async {
                       Task {
                            let output = await self.runCodeAsync()
                            DispatchQueue.main.async {
                                Log.append(output)
                            }
                        }
                    }
                }
            }
        }
    }

    func runCodeAsync() async -> (String) {
        
        let task = Process()
        task.executableURL = URL(fileURLWithPath: "/sbin/ping")
        task.arguments = [ "-c", "3", "127.0.0.1" ]

        let outputPipe = Pipe()
        task.standardOutput = outputPipe
        await task.launch()    //Xcode Warning: no 'async' operations occur within 'await' expression

        let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
        let output = String(decoding: outputData, as: UTF8.self)

        return await output    //Xcode Warning: no 'async' operations occur within 'await' expression
    }
}

Answer 1

试试下面的代码，不要使用异步：

EDIT-1：

struct MainView: View {
    @State var log: String = "testing"
    
    var body: some View {
        Text(log)
            .onAppear {
               runCode()
            }
            .frame(width: 444, height: 444)
    }
    
    func runCode() {
        let task = Process()
        task.executableURL = URL(fileURLWithPath: "/sbin/ping")
        task.arguments = [ "-c", "3", "127.0.0.1" ]
        let outputPipe = Pipe()
        task.standardOutput = outputPipe
        let outputHandle = outputPipe.fileHandleForReading
        outputHandle.readabilityHandler = { pipe in
            if let ouput = String(data: pipe.availableData, encoding: .utf8) {
                if !ouput.isEmpty {
                    log += " " + ouput
                    print("----> ouput: \(ouput)")
                }
            } else {
                print("Error decoding data: \(pipe.availableData)")
            }
        }
        task.launch()
    }
}