83 lines
3.0 KiB
Swift
83 lines
3.0 KiB
Swift
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// Copyright © 2021 Metabolist. All rights reserved.
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import Combine
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import UIKit
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import WebKit
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final class InstancePickerViewController: UIViewController {
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private let selectionAction: (InstancePickerViewController, String) -> Void
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private let webView: WKWebView
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private let backButton: UIBarButtonItem
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private let forwardButton: UIBarButtonItem
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private var cancellables = Set<AnyCancellable>()
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init(selectionAction: @escaping (InstancePickerViewController, String) -> Void) {
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let webView = WKWebView()
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webView.allowsBackForwardNavigationGestures = true
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self.webView = webView
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self.selectionAction = selectionAction
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backButton = UIBarButtonItem(title: nil, image: UIImage(systemName: "chevron.backward"),
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primaryAction: UIAction { _ in webView.goBack() })
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forwardButton = UIBarButtonItem(title: nil, image: UIImage(systemName: "chevron.forward"),
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primaryAction: UIAction { _ in webView.goForward() })
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super.init(nibName: nil, bundle: nil)
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func loadView() {
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view = webView
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webView.navigationDelegate = self
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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navigationItem.leftBarButtonItem = UIBarButtonItem(
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systemItem: .done,
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primaryAction: UIAction { [weak self] _ in self?.presentingViewController?.dismiss(animated: true) })
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navigationItem.rightBarButtonItems = [forwardButton, backButton]
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webView.publisher(for: \.canGoBack)
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.sink { [weak self] in self?.backButton.isEnabled = $0 }
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.store(in: &cancellables)
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webView.publisher(for: \.canGoForward)
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.sink { [weak self] in self?.forwardButton.isEnabled = $0 }
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.store(in: &cancellables)
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webView.publisher(for: \.title)
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.sink { [weak self] in self?.navigationItem.title = $0 }
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.store(in: &cancellables)
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webView.load(.init(url: Self.url))
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}
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}
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extension InstancePickerViewController: WKNavigationDelegate {
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func webView(_ webView: WKWebView,
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decidePolicyFor navigationAction: WKNavigationAction,
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preferences: WKWebpagePreferences,
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decisionHandler: @escaping (WKNavigationActionPolicy, WKWebpagePreferences) -> Void) {
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if webView.url?.host == "joinmastodon.org",
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let url = navigationAction.request.url,
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let host = url.host,
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host != "joinmastodon.org",
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url.pathComponents == ["/", "about"] {
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decisionHandler(.cancel, preferences)
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selectionAction(self, host)
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} else {
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decisionHandler(.allow, preferences)
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}
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}
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}
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private extension InstancePickerViewController {
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static let url = URL(string: "https://joinmastodon.org/communities")!
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}
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