2019-09-21 17:37:21 +02:00
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//
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2020-01-01 00:55:39 +01:00
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// WebViewProvider.swift
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2019-09-21 17:37:21 +02:00
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 9/21/19.
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// Copyright © 2019 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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/// WKWebView has an awful behavior of a flash to white on first load when in dark mode.
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/// Keep a queue of WebViews where we've already done a trivial load so that by the time we need them in the UI, they're past the flash-to-shite part of their lifecycle.
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2020-01-01 00:55:39 +01:00
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class WebViewProvider: NSObject, WKNavigationDelegate {
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2019-09-21 17:37:21 +02:00
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2020-01-27 20:58:32 +01:00
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let articleIconSchemeHandler: ArticleIconSchemeHandler
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2019-11-07 21:29:16 +01:00
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2019-09-21 17:37:21 +02:00
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private let minimumQueueDepth = 3
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private let maximumQueueDepth = 6
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2020-01-30 01:39:40 +01:00
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private var queue = UIView()
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2019-09-21 17:37:21 +02:00
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private var waitingForFirstLoad = true
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private var waitingCompletionHandler: ((WKWebView) -> ())?
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2020-01-30 01:39:40 +01:00
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init(coordinator: SceneCoordinator, viewController: UIViewController) {
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2020-01-27 20:58:32 +01:00
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articleIconSchemeHandler = ArticleIconSchemeHandler(coordinator: coordinator)
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super.init()
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2020-01-30 20:53:27 +01:00
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viewController.view.insertSubview(queue, at: 0)
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2020-01-27 20:58:32 +01:00
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replenishQueueIfNeeded()
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}
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2019-09-21 17:37:21 +02:00
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func dequeueWebView(completion: @escaping (WKWebView) -> ()) {
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if waitingForFirstLoad {
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waitingCompletionHandler = completion
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} else {
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completeRequest(completion: completion)
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}
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}
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func enqueueWebView(_ webView: WKWebView) {
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2020-01-30 01:39:40 +01:00
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guard queue.subviews.count < maximumQueueDepth else {
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2019-09-21 17:37:21 +02:00
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return
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}
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webView.navigationDelegate = self
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2020-01-30 01:39:40 +01:00
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queue.insertSubview(webView, at: 0)
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2019-09-21 17:37:21 +02:00
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2020-01-27 04:29:58 +01:00
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webView.loadFileURL(ArticleRenderer.page.url, allowingReadAccessTo: ArticleRenderer.page.baseURL)
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2019-09-21 17:37:21 +02:00
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}
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// MARK: WKNavigationDelegate
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func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
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if waitingForFirstLoad {
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waitingForFirstLoad = false
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if let completion = waitingCompletionHandler {
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completeRequest(completion: completion)
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waitingCompletionHandler = nil
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}
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}
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}
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// MARK: Private
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private func replenishQueueIfNeeded() {
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2020-01-30 01:39:40 +01:00
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while queue.subviews.count < minimumQueueDepth {
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2019-09-21 22:59:51 +02:00
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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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2019-10-14 02:41:34 +02:00
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configuration.setValue(true, forKey: "allowUniversalAccessFromFileURLs")
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2019-09-21 22:59:51 +02:00
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configuration.allowsInlineMediaPlayback = true
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configuration.mediaTypesRequiringUserActionForPlayback = .video
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2019-11-07 21:29:16 +01:00
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configuration.setURLSchemeHandler(articleIconSchemeHandler, forURLScheme: ArticleRenderer.imageIconScheme)
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2019-09-21 22:59:51 +02:00
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let webView = WKWebView(frame: .zero, configuration: configuration)
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2019-09-21 17:37:21 +02:00
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enqueueWebView(webView)
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}
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}
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private func completeRequest(completion: @escaping (WKWebView) -> ()) {
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2020-01-30 01:39:40 +01:00
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if let webView = queue.subviews.last as? WKWebView {
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webView.removeFromSuperview()
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2019-09-21 17:37:21 +02:00
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webView.navigationDelegate = nil
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replenishQueueIfNeeded()
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completion(webView)
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return
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}
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assertionFailure("Creating WKWebView in \(#function); queue has run dry.")
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let webView = WKWebView(frame: .zero)
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completion(webView)
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}
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}
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