NetNewsWire/iOS/Article/PreloadedWebView.swift

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//
// PreloadedWebView.swift
// NetNewsWire-iOS
//
// Created by Maurice Parker on 2/25/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import Foundation
import WebKit
class PreloadedWebView: WKWebView {
private var isReady: Bool = false
private var readyCompletion: (() -> Void)?
init(articleIconSchemeHandler: ArticleIconSchemeHandler) {
let preferences = WKPreferences()
preferences.javaScriptCanOpenWindowsAutomatically = false
preferences.javaScriptEnabled = true
let configuration = WKWebViewConfiguration()
configuration.preferences = preferences
configuration.setValue(true, forKey: "allowUniversalAccessFromFileURLs")
configuration.allowsInlineMediaPlayback = true
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configuration.mediaTypesRequiringUserActionForPlayback = .audio
configuration.setURLSchemeHandler(articleIconSchemeHandler, forURLScheme: ArticleRenderer.imageIconScheme)
super.init(frame: .zero, configuration: configuration)
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
func preload() {
navigationDelegate = self
loadFileURL(ArticleRenderer.blank.url, allowingReadAccessTo: ArticleRenderer.blank.baseURL)
}
func ready(completion: @escaping () -> Void) {
if isReady {
completeRequest(completion: completion)
} else {
readyCompletion = completion
}
}
}
// MARK: WKScriptMessageHandler
extension PreloadedWebView: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
isReady = true
if let completion = readyCompletion {
completeRequest(completion: completion)
readyCompletion = nil
}
}
}
// MARK: Private
private extension PreloadedWebView {
func completeRequest(completion: @escaping () -> Void) {
isReady = false
navigationDelegate = nil
completion()
}
}