はじめに

URLからWebサイトのタイトルを取得することがあり、実装したので記録しておきます。

サンプルアプリ

実装

ContentView

import SwiftUI

struct ContentView: View {
    @StateObject var viewModel = ViewModel()
    var body: some View {
        VStack(spacing: 20) {
            TextField("URLを入力してください", text: $viewModel.url, axis: .vertical)
                .textFieldStyle(.roundedBorder)

            Text(viewModel.title)
        }
        .padding(20)
    }
}

ViewModel

import Combine
import Foundation

final class ViewModel: ObservableObject {
    @Published var url: String = ""

    @Published var title: String = ""

    private var cancellables = Set<AnyCancellable>()

    init() {
        $url.sink { [weak self] _ in
            guard let self else { return }
            self.fetchURLTitle()
        }
        .store(in: &cancellables)
    }

    private func fetchURLTitle() {
        guard let url = URL(string: url) else { return }
        URLSession.shared.dataTaskPublisher(for: url)
            .map { data, _ in String(data: data, encoding: .utf8) }
            .compactMap { $0 }
            .replaceError(with: "")
            .receive(on: DispatchQueue.global())
            .map { html in
                guard let range = html.range(of: "<title>.*?</title>", options: .regularExpression, range: nil, locale: nil) else { return "" }
                return html[range].replacingOccurrences(of: "</?title>", with: "", options: .regularExpression, range: nil)
            }
            .receive(on: DispatchQueue.main)
            .sink { [weak self] title in
                guard let self else { return }
                self.title = title
            }
            .store(in: &cancellables)
    }
}

おわり

次はOGPも取得してみたいです