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//
// WebViewController.swift
// AltStoreCore
//
// Created by Riley Testut on 10/31/23.
// Copyright © 2023 Riley Testut. All rights reserved.
//
import UIKit
import WebKit
import Combine
public protocol WebViewControllerDelegate: NSObject
{
func webViewControllerDidFinish(_ webViewController: WebViewController)
}
public class WebViewController: UIViewController
{
//MARK: Public Properties
public weak var delegate: WebViewControllerDelegate?
// WKWebView used to display webpages
public private(set) var webView: WKWebView!
public private(set) lazy var backButton: UIBarButtonItem = UIBarButtonItem(image: UIImage(systemName: "chevron.backward"), style: .plain, target: self, action: #selector(WebViewController.goBack(_:)))
public private(set) lazy var forwardButton: UIBarButtonItem = UIBarButtonItem(image: UIImage(systemName: "chevron.forward"), style: .plain, target: self, action: #selector(WebViewController.goForward(_:)))
public private(set) lazy var shareButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(WebViewController.shareLink(_:)))
public private(set) lazy var reloadButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .refresh, target: self, action: #selector(WebViewController.refresh(_:)))
public private(set) lazy var stopLoadingButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .stop, target: self, action: #selector(WebViewController.refresh(_:)))
public private(set) lazy var doneButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(WebViewController.dismissWebViewController(_:)))
//MARK: Private Properties
private let progressView = UIProgressView()
private lazy var refreshButton: UIBarButtonItem = self.reloadButton
private let initialReqest: URLRequest?
private var ignoreUpdateProgress: Bool = false
private var cancellables: Set<AnyCancellable> = []
public required init(request: URLRequest?, configuration: WKWebViewConfiguration = WKWebViewConfiguration())
{
self.initialReqest = request
super.init(nibName: nil, bundle: nil)
self.webView = WKWebView(frame: CGRectZero, configuration: configuration)
self.webView.allowsBackForwardNavigationGestures = true
self.progressView.progressViewStyle = .bar
self.progressView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.progressView.progress = 0.5
self.progressView.alpha = 0.0
self.progressView.isHidden = true
}
public convenience init(url: URL?, configuration: WKWebViewConfiguration = WKWebViewConfiguration())
{
if let url
{
let request = URLRequest(url: url)
self.init(request: request, configuration: configuration)
}
else
{
self.init(request: nil, configuration: configuration)
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
//MARK: UIViewController
public override func loadView()
{
self.preparePipeline()
if let request = self.initialReqest
{
self.webView.load(request)
}
self.view = self.webView
}
public override func viewDidLoad()
{
super.viewDidLoad()
self.navigationController?.isModalInPresentation = true
self.navigationController?.view.tintColor = .altPrimary
if let navigationBar = self.navigationController?.navigationBar
{
navigationBar.scrollEdgeAppearance = navigationBar.standardAppearance
}
if let toolbar = self.navigationController?.toolbar, #available(iOS 15, *)
{
toolbar.scrollEdgeAppearance = toolbar.standardAppearance
}
}
public override func viewIsAppearing(_ animated: Bool)
{
super.viewIsAppearing(animated)
if self.webView.estimatedProgress < 1.0
{
self.transitionCoordinator?.animate(alongsideTransition: { context in
self.showProgressBar(animated: true)
}) { context in
if context.isCancelled
{
self.hideProgressBar(animated: false)
}
}
}
self.navigationController?.setToolbarHidden(false, animated: false)
self.update()
}
public override func viewWillDisappear(_ animated: Bool)
{
super.viewWillDisappear(animated)
var shouldHideToolbarItems = true
if let toolbarItems = self.navigationController?.topViewController?.toolbarItems
{
if toolbarItems.count > 0
{
shouldHideToolbarItems = false
}
}
if shouldHideToolbarItems
{
self.navigationController?.setToolbarHidden(true, animated: false)
}
self.transitionCoordinator?.animate(alongsideTransition: { context in
self.hideProgressBar(animated: true)
}) { (context) in
if context.isCancelled && self.webView.estimatedProgress < 1.0
{
self.showProgressBar(animated: false)
}
}
}
public override func didMove(toParent parent: UIViewController?)
{
super.didMove(toParent: parent)
if parent == nil
{
self.webView.stopLoading()
}
}
deinit
{
self.webView.stopLoading()
}
}
private extension WebViewController
{
func preparePipeline()
{
self.webView.publisher(for: \.title, options: [.initial, .new])
.sink { [weak self] title in
self?.title = title
}
.store(in: &self.cancellables)
self.webView.publisher(for: \.estimatedProgress, options: [.new])
.sink { [weak self] progress in
self?.updateProgress(progress)
}
.store(in: &self.cancellables)
Publishers.Merge3(
self.webView.publisher(for: \.isLoading, options: [.new]),
self.webView.publisher(for: \.canGoBack, options: [.new]),
self.webView.publisher(for: \.canGoForward, options: [.new])
)
.sink { [weak self] _ in
self?.update()
}
.store(in: &self.cancellables)
}
func update()
{
if self.webView.isLoading
{
self.refreshButton = self.stopLoadingButton
}
else
{
self.refreshButton = self.reloadButton
}
self.backButton.isEnabled = self.webView.canGoBack
self.forwardButton.isEnabled = self.webView.canGoForward
self.navigationItem.leftBarButtonItem = self.doneButton
self.navigationItem.rightBarButtonItem = self.refreshButton
self.toolbarItems = [self.backButton, .fixedSpace(70), self.forwardButton, .flexibleSpace(), self.shareButton]
}
func updateProgress(_ progress: Double)
{
if self.progressView.isHidden
{
self.showProgressBar(animated: true)
}
if self.ignoreUpdateProgress
{
self.ignoreUpdateProgress = false
self.hideProgressBar(animated: true)
}
else if progress < Double(self.progressView.progress)
{
// If progress is less than self.progressView.progress, another webpage began to load before the first one completed
// In this case, we set the progress back to 0.0, and then wait until the next updateProgress, because it results in a much better animation
self.progressView.setProgress(0.0, animated: false)
}
else
{
UIView.animate(withDuration: 0.4, animations: {
self.progressView.setProgress(Float(progress), animated: true)
}, completion: { (finished) in
if progress == 1.0
{
// This delay serves two purposes. One, it keeps the progress bar on screen just a bit longer so it doesn't appear to disappear too quickly.
// Two, it allows us to prevent the progress bar from disappearing if the user actually started loading another webpage before the current one finished loading.
DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
if self.webView.estimatedProgress == 1.0
{
self.hideProgressBar(animated: true)
}
}
}
})
}
}
func showProgressBar(animated: Bool)
{
let navigationBarBounds = self.navigationController?.navigationBar.bounds ?? .zero
self.progressView.frame = CGRect(x: 0, y: navigationBarBounds.height - self.progressView.bounds.height, width: navigationBarBounds.width, height: self.progressView.bounds.height)
self.navigationController?.navigationBar.addSubview(self.progressView)
self.progressView.setProgress(Float(self.webView.estimatedProgress), animated: false)
self.progressView.isHidden = false
if animated
{
UIView.animate(withDuration: 0.4) {
self.progressView.alpha = 1.0
}
}
else
{
self.progressView.alpha = 1.0
}
}
func hideProgressBar(animated: Bool)
{
if animated
{
UIView.animate(withDuration: 0.4, animations: {
self.progressView.alpha = 0.0
}, completion: { (finished) in
self.progressView.setProgress(0.0, animated: false)
self.progressView.isHidden = true
self.progressView.removeFromSuperview()
})
}
else
{
self.progressView.alpha = 0.0
// Completion
self.progressView.setProgress(0.0, animated: false)
self.progressView.isHidden = true
self.progressView.removeFromSuperview()
}
}
}
@objc
private extension WebViewController
{
func goBack(_ sender: UIBarButtonItem)
{
self.webView.goBack()
}
func goForward(_ sender: UIBarButtonItem)
{
self.webView.goForward()
}
func refresh(_ sender: UIBarButtonItem)
{
if self.webView.isLoading
{
self.ignoreUpdateProgress = true
self.webView.stopLoading()
}
else
{
if let initialRequest = self.initialReqest, self.webView.url == nil && self.webView.backForwardList.backList.count == 0
{
self.webView.load(initialRequest)
}
else
{
self.webView.reload()
}
}
}
func shareLink(_ sender: UIBarButtonItem)
{
let url = self.webView.url ?? (NSURL() as URL)
let activityViewController = UIActivityViewController(activityItems: [url], applicationActivities: nil)
activityViewController.modalPresentationStyle = .popover
activityViewController.popoverPresentationController?.barButtonItem = sender
self.present(activityViewController, animated: true)
}
func dismissWebViewController(_ sender: UIBarButtonItem)
{
self.delegate?.webViewControllerDidFinish(self)
self.parent?.dismiss(animated: true)
}
}
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