82 lines
2.2 KiB
Swift
82 lines
2.2 KiB
Swift
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//
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// PreloadedWebView.swift
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 2/25/20.
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// Copyright © 2020 Ranchero Software. All rights reserved.
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//
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import Foundation
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import WebKit
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class PreloadedWebView: WKWebView {
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private struct MessageName {
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static let domContentLoaded = "domContentLoaded"
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}
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private var isReady: Bool = false
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private var readyCompletion: ((PreloadedWebView) -> Void)?
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init(articleIconSchemeHandler: ArticleIconSchemeHandler) {
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let preferences = WKPreferences()
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preferences.javaScriptCanOpenWindowsAutomatically = false
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preferences.javaScriptEnabled = true
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let configuration = WKWebViewConfiguration()
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configuration.preferences = preferences
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configuration.setValue(true, forKey: "allowUniversalAccessFromFileURLs")
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configuration.allowsInlineMediaPlayback = true
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configuration.mediaTypesRequiringUserActionForPlayback = .video
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configuration.setURLSchemeHandler(articleIconSchemeHandler, forURLScheme: ArticleRenderer.imageIconScheme)
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super.init(frame: .zero, configuration: configuration)
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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}
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func preload() {
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configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.domContentLoaded)
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loadFileURL(ArticleRenderer.page.url, allowingReadAccessTo: ArticleRenderer.page.baseURL)
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}
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func ready(completion: @escaping (PreloadedWebView) -> Void) {
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if isReady {
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completeRequest(completion: completion)
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} else {
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readyCompletion = completion
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}
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}
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}
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// MARK: WKScriptMessageHandler
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extension PreloadedWebView: WKScriptMessageHandler {
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func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
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if message.name == MessageName.domContentLoaded {
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isReady = true
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if let completion = readyCompletion {
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completeRequest(completion: completion)
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readyCompletion = nil
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}
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}
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}
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}
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// MARK: Private
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private extension PreloadedWebView {
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func completeRequest(completion: @escaping (PreloadedWebView) -> Void) {
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isReady = false
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configuration.userContentController.removeScriptMessageHandler(forName: MessageName.domContentLoaded)
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completion(self)
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}
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}
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