cannot preview in this file

Question

実現したいこと

cannot preview in this fileと表示されConvasが表示されません。

Buildは成功しています。

また、警告は下記５つが出力されています。

・Run script build phase 'Create Symlinks to Header Folders' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase.

・Run script build phase 'Create Symlinks to Header Folders' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase.

・Run script build phase 'Create Symlinks to Header Folders' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase.

・Run script build phase 'Create Symlinks to Header Folders' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase.

・Run script build phase 'Create Symlinks to Header Folders' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase.

該当のソースコード

//
//  MessageAppApp.swift
//  MessageApp
//
//  Created by hashimo ryoya on 2023/04/13.
//

import SwiftUI
import FirebaseCore
// 追加
class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication,
                    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        FirebaseApp.configure()
        return true
    }
}

@main
struct MessageAppApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

//
//  ContentView.swift
//  MessageApp
//
//  Created by hashimo ryoya on 2023/04/13.
//

import SwiftUI
import FirebaseDatabase

struct ContentView: View {
    @State private var message: String = ""
    @State private var messages: [String] = []

    private let ref = Database.database().reference().child("messages")

    var body: some View {
        VStack {
            List(messages, id: \.self) { message in
                Text(message)
            }

            HStack {
                TextField("Message", text: $message)
                    .textFieldStyle(RoundedBorderTextFieldStyle())

                Button("Send") {
                    sendMessage()
                }
                .padding(.leading)
            }
            .padding()
        }
        .onAppear {
            observeMessages()
        }
    }

    private func observeMessages() {
        ref.observe(.value) { snapshot in
            var messages: [String] = []
            for child in snapshot.children {
                if let snapshot = child as? DataSnapshot,
                   let message = snapshot.value as? String {
                    messages.append(message)
                }
            }
            self.messages = messages.reversed()
        }
    }

    private func sendMessage() {
        ref.childByAutoId().setValue(message)
        message = ""
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

試したこと

Xcodeの再起動を行ったのですが解決しませんでした。

補足情報（FW/ツールのバージョンなど）

swift-driver version: 1.75.2
Xcode 14.3
Build version 14E222b

Comments

[KEMONO_PANTSU_k]

https://stackoverflow.com/questions/58416469/cannot-preview-in-this-file-active-scheme-does-not-build-this-file-swiftui-o

リンク先などを見ますと、
iCloud Driveディレクトリの中にあるとダメっぽいことがあるみたいですね。

[karirin3948]

回答ありがとうございます。
こちら再起動したところ解決しました。

Answer 1

再起動したところ解決しました。