metatext/View Controllers/TableViewController.swift

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Swift
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// Copyright © 2020 Metabolist. All rights reserved.
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import AVKit
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import Combine
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import SafariServices
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import SwiftUI
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import ViewModels
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// swiftlint:disable file_length
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class TableViewController: UITableViewController {
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var transitionViewTag = -1
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private let viewModel: CollectionViewModel
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private let identification: Identification
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private let loadingTableFooterView = LoadingTableFooterView()
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private let webfingerIndicatorView = WebfingerIndicatorView()
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private var cancellables = Set<AnyCancellable>()
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private var cellHeightCaches = [CGFloat: [CollectionItem: CGFloat]]()
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private lazy var dataSource: TableViewDataSource = {
.init(tableView: tableView, viewModelProvider: viewModel.viewModel(indexPath:))
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}()
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init(viewModel: CollectionViewModel, identification: Identification) {
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self.viewModel = viewModel
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self.identification = identification
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super.init(style: .plain)
}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = dataSource
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tableView.prefetchDataSource = self
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tableView.cellLayoutMarginsFollowReadableWidth = true
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tableView.tableFooterView = UIView()
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tableView.contentInset.bottom = Self.bottomInset
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view.addSubview(webfingerIndicatorView)
webfingerIndicatorView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
webfingerIndicatorView.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
webfingerIndicatorView.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor)
])
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setupViewModelBindings()
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}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
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viewModel.request(maxId: nil, minId: nil)
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}
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override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
updateAutoplayViews()
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
updateAutoplayViews()
}
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override func scrollViewDidScroll(_ scrollView: UIScrollView) {
guard scrollView.isDragging else { return }
let up = scrollView.panGestureRecognizer.translation(in: scrollView.superview).y > 0
for loadMoreView in visibleLoadMoreViews {
loadMoreView.directionChanged(up: up)
}
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updateAutoplayViews()
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}
override func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
for loadMoreView in visibleLoadMoreViews {
loadMoreView.finalizeDirectionChange()
}
}
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override func tableView(_ tableView: UITableView,
willDisplay cell: UITableViewCell,
forRowAt indexPath: IndexPath) {
guard let item = dataSource.itemIdentifier(for: indexPath) else { return }
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var heightCache = cellHeightCaches[tableView.frame.width] ?? [CollectionItem: CGFloat]()
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heightCache[item] = cell.frame.height
cellHeightCaches[tableView.frame.width] = heightCache
}
override func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
guard let item = dataSource.itemIdentifier(for: indexPath) else { return UITableView.automaticDimension }
return cellHeightCaches[tableView.frame.width]?[item] ?? UITableView.automaticDimension
}
override func tableView(_ tableView: UITableView, shouldHighlightRowAt indexPath: IndexPath) -> Bool {
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viewModel.canSelect(indexPath: indexPath)
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}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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tableView.deselectRow(at: indexPath, animated: true)
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viewModel.select(indexPath: indexPath)
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}
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override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
sizeTableHeaderFooterViews()
}
}
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extension TableViewController {
static let autoplayableAttachmentsView = PassthroughSubject<StatusAttachmentsView?, Never>()
static let autoplayableAttachmentsViewNotification =
Notification.Name("com.metabolist.metatext.attachment-view-became-autoplayable")
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func report(viewModel: ReportViewModel) {
let reportViewController = ReportViewController(viewModel: viewModel)
let navigationController = UINavigationController(rootViewController: reportViewController)
present(navigationController, animated: true)
}
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}
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extension TableViewController: UITableViewDataSourcePrefetching {
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func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
guard
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let maxId = viewModel.nextPageMaxId,
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let indexPath = indexPaths.last,
indexPath.section == dataSource.numberOfSections(in: tableView) - 1,
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indexPath.row == dataSource.tableView(tableView, numberOfRowsInSection: indexPath.section) - 1
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else { return }
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viewModel.request(maxId: maxId, minId: nil)
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}
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}
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extension TableViewController {
func sizeTableHeaderFooterViews() {
// https://useyourloaf.com/blog/variable-height-table-view-header/
if let headerView = tableView.tableHeaderView {
let size = headerView.systemLayoutSizeFitting(
CGSize(width: tableView.frame.width, height: .greatestFiniteMagnitude),
withHorizontalFittingPriority: .required,
verticalFittingPriority: .fittingSizeLevel)
if headerView.frame.size.height != size.height {
headerView.frame.size.height = size.height
tableView.tableHeaderView = headerView
tableView.layoutIfNeeded()
}
view.insertSubview(webfingerIndicatorView, aboveSubview: headerView)
}
if let footerView = tableView.tableFooterView {
let size = footerView.systemLayoutSizeFitting(
CGSize(width: tableView.frame.width, height: .greatestFiniteMagnitude),
withHorizontalFittingPriority: .required,
verticalFittingPriority: .fittingSizeLevel)
if footerView.frame.size.height != size.height {
footerView.frame.size.height = size.height
tableView.tableFooterView = footerView
tableView.layoutIfNeeded()
}
}
}
}
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extension TableViewController: AVPlayerViewControllerDelegate {
func playerViewController(
_ playerViewController: AVPlayerViewController,
willEndFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator) {
try? AVAudioSession.sharedInstance().setCategory(.ambient, mode: .default)
playerViewController.player?.isMuted = true
updateAutoplayViews()
}
}
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extension TableViewController: ZoomAnimatorDelegate {
func transitionWillStartWith(zoomAnimator: ZoomAnimator) {
view.layoutIfNeeded()
guard let imageViewController = (presentedViewController as? ImageNavigationController)?.currentViewController
else { return }
if imageViewController.playerView.tag != 0 {
transitionViewTag = imageViewController.playerView.tag
} else if imageViewController.imageView.tag != 0 {
transitionViewTag = imageViewController.imageView.tag
}
}
func transitionDidEndWith(zoomAnimator: ZoomAnimator) {
}
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func referenceView(for zoomAnimator: ZoomAnimator) -> UIView? {
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view.viewWithTag(transitionViewTag)
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}
func referenceViewFrameInTransitioningView(for zoomAnimator: ZoomAnimator) -> CGRect? {
guard let referenceView = referenceView(for: zoomAnimator) else { return nil }
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return parent?.view.convert(referenceView.frame, from: referenceView.superview)
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}
}
private extension TableViewController {
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static let bottomInset: CGFloat = .newStatusButtonDimension + .defaultSpacing * 4
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var visibleLoadMoreViews: [LoadMoreView] {
tableView.visibleCells.compactMap { $0.contentView as? LoadMoreView }
}
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func setupViewModelBindings() {
viewModel.title.sink { [weak self] in self?.navigationItem.title = $0 }.store(in: &cancellables)
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viewModel.titleLocalizationComponents.sink { [weak self] in
guard let key = $0.first else { return }
self?.navigationItem.title = String(
format: NSLocalizedString(key, comment: ""),
arguments: Array($0.suffix(from: 1)))
}
.store(in: &cancellables)
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viewModel.updates.sink { [weak self] in self?.update($0) }.store(in: &cancellables)
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viewModel.events.receive(on: DispatchQueue.main)
.sink { [weak self] in self?.handle(event: $0) }
.store(in: &cancellables)
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viewModel.expandAll.receive(on: DispatchQueue.main)
.sink { [weak self] in self?.set(expandAllState: $0) }
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.store(in: &cancellables)
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viewModel.loading.receive(on: RunLoop.main).sink { [weak self] in
guard let self = self else { return }
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self.tableView.tableFooterView = $0 ? self.loadingTableFooterView : UIView()
self.sizeTableHeaderFooterViews()
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}
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.store(in: &cancellables)
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viewModel.alertItems
.compactMap { $0 }
.sink { [weak self] in self?.present(alertItem: $0) }
.store(in: &cancellables)
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tableView.publisher(for: \.contentOffset)
.compactMap { [weak self] _ in self?.tableView.indexPathsForVisibleRows?.first }
.sink { [weak self] in self?.viewModel.viewedAtTop(indexPath: $0) }
.store(in: &cancellables)
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Self.autoplayableAttachmentsView
.removeDuplicates()
.sink {
let notification = Notification(
name: Self.autoplayableAttachmentsViewNotification,
object: $0,
userInfo: nil)
NotificationCenter.default.post(notification)
}
.store(in: &cancellables)
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}
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func update(_ update: CollectionUpdate) {
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var offsetFromNavigationBar: CGFloat?
if
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let itemId = update.maintainScrollPositionItemId,
let indexPath = dataSource.indexPath(itemId: itemId),
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let navigationBar = navigationController?.navigationBar {
let navigationBarMaxY = tableView.convert(navigationBar.bounds, from: navigationBar).maxY
offsetFromNavigationBar = tableView.rectForRow(at: indexPath).origin.y - navigationBarMaxY
}
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self.dataSource.apply(update.items.snapshot(), animatingDifferences: false) { [weak self] in
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guard let self = self else { return }
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if
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let itemId = update.maintainScrollPositionItemId,
let indexPath = self.dataSource.indexPath(itemId: itemId) {
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if self.viewModel.shouldAdjustContentInset {
self.tableView.contentInset.bottom = max(
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Self.bottomInset,
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self.tableView.frame.height
- self.tableView.contentSize.height
- self.tableView.safeAreaInsets.top
- self.tableView.safeAreaInsets.bottom)
+ self.tableView.rectForRow(at: indexPath).minY
}
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self.tableView.scrollToRow(at: indexPath, at: .top, animated: false)
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if let offsetFromNavigationBar = offsetFromNavigationBar {
self.tableView.contentOffset.y -= offsetFromNavigationBar
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}
}
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self.updateAutoplayViews()
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}
}
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func handle(event: CollectionItemEvent) {
switch event {
case .ignorableOutput:
break
case let .share(url):
share(url: url)
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case let .navigation(navigation):
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switch navigation {
case let .collection(collectionService):
show(TableViewController(
viewModel: CollectionItemsViewModel(
collectionService: collectionService,
identification: identification),
identification: identification),
sender: self)
case let .profile(profileService):
show(ProfileViewController(
viewModel: ProfileViewModel(
profileService: profileService,
identification: identification),
identification: identification),
sender: self)
case let .url(url):
present(SFSafariViewController(url: url), animated: true)
case .webfingerStart:
webfingerIndicatorView.startAnimating()
case .webfingerEnd:
webfingerIndicatorView.stopAnimating()
}
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case let .attachment(attachmentViewModel, statusViewModel):
present(attachmentViewModel: attachmentViewModel, statusViewModel: statusViewModel)
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case let .report(reportViewModel):
report(viewModel: reportViewModel)
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}
}
func present(attachmentViewModel: AttachmentViewModel, statusViewModel: StatusViewModel) {
switch attachmentViewModel.attachment.type {
case .audio, .video:
let playerViewController = AVPlayerViewController()
let player: AVPlayer
if attachmentViewModel.attachment.type == .video {
player = PlayerCache.shared.player(url: attachmentViewModel.attachment.url)
} else {
player = AVPlayer(url: attachmentViewModel.attachment.url)
}
playerViewController.delegate = self
playerViewController.player = player
present(playerViewController, animated: true) {
try? AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
player.isMuted = false
player.play()
}
case .image, .gifv:
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let imagePageViewController = ImagePageViewController(
initiallyVisible: attachmentViewModel,
statusViewModel: statusViewModel)
let imageNavigationController = ImageNavigationController(imagePageViewController: imagePageViewController)
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imageNavigationController.transitionController.fromDelegate = self
transitionViewTag = attachmentViewModel.tag
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present(imageNavigationController, animated: true)
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case .unknown:
break
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}
}
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func set(expandAllState: ExpandAllState) {
switch expandAllState {
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case .hidden:
navigationItem.rightBarButtonItem = nil
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case .expand:
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navigationItem.rightBarButtonItem = UIBarButtonItem(
title: NSLocalizedString("status.show-more", comment: ""),
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image: UIImage(systemName: "eye"),
primaryAction: UIAction { [weak self] _ in self?.viewModel.toggleExpandAll() })
case .collapse:
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navigationItem.rightBarButtonItem = UIBarButtonItem(
title: NSLocalizedString("status.show-less", comment: ""),
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image: UIImage(systemName: "eye.slash"),
primaryAction: UIAction { [weak self] _ in self?.viewModel.toggleExpandAll() })
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}
}
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func share(url: URL) {
let activityViewController = UIActivityViewController(activityItems: [url], applicationActivities: nil)
present(activityViewController, animated: true, completion: nil)
}
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func updateAutoplayViews() {
if let visibleView = navigationController?.visibleViewController?.view,
view.isDescendant(of: visibleView),
let superview = view.superview,
let attachmentsViewClosestToCenter = tableView.visibleCells
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.compactMap({ ($0.contentView as? StatusView)?.bodyView.attachmentsView })
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.filter(\.shouldAutoplay)
.min(by: {
abs(superview.convert($0.frame, from: $0.superview).midY - view.frame.midY)
< abs(superview.convert($1.frame, from: $1.superview).midY - view.frame.midY)
}) {
Self.autoplayableAttachmentsView.send(attachmentsViewClosestToCenter)
} else {
Self.autoplayableAttachmentsView.send(nil)
}
}
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}
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// swiftlint:enable file_length