Kurdtvs-Live-Kurdish-TV-Kur.../Mastodon/Scene/PublicTimeline/PublicTimelineViewControlle...

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Swift
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//
// PublicTimelineViewController.swift
// Mastodon
//
// Created by sxiaojian on 2021/1/27.
//
import AVKit
import Combine
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import CoreData
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import CoreDataStack
import GameplayKit
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import os.log
import UIKit
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final class PublicTimelineViewController: UIViewController, NeedsDependency, TimelinePostTableViewCellDelegate {
weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
var disposeBag = Set<AnyCancellable>()
var viewModel: PublicTimelineViewModel!
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let refreshControl = UIRefreshControl()
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lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.register(TimelinePostTableViewCell.self, forCellReuseIdentifier: String(describing: TimelinePostTableViewCell.self))
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tableView.register(TimelineMiddleLoaderTableViewCell.self, forCellReuseIdentifier: String(describing: TimelineMiddleLoaderTableViewCell.self))
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tableView.register(TimelineBottomLoaderTableViewCell.self, forCellReuseIdentifier: String(describing: TimelineBottomLoaderTableViewCell.self))
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tableView.rowHeight = UITableView.automaticDimension
tableView.separatorStyle = .none
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tableView.backgroundColor = .clear
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return tableView
}()
deinit {
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os_log("%{public}s[%{public}ld], %{public}s", (#file as NSString).lastPathComponent, #line, #function)
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}
}
extension PublicTimelineViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = Asset.Colors.Background.systemBackground.color
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tableView.refreshControl = refreshControl
refreshControl.addTarget(self, action: #selector(PublicTimelineViewController.refreshControlValueChanged(_:)), for: .valueChanged)
// bind refresh control
viewModel.isFetchingLatestTimeline
.receive(on: DispatchQueue.main)
.sink { [weak self] isFetching in
guard let self = self else { return }
if !isFetching {
UIView.animate(withDuration: 0.5) { [weak self] in
guard let self = self else { return }
self.refreshControl.endRefreshing()
}
}
}
.store(in: &disposeBag)
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tableView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(tableView)
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NSLayoutConstraint.activate([
tableView.topAnchor.constraint(equalTo: view.topAnchor),
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
])
viewModel.tableView = tableView
viewModel.contentOffsetAdjustableTimelineViewControllerDelegate = self
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tableView.delegate = self
viewModel.setupDiffableDataSource(
for: tableView,
dependency: self,
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timelinePostTableViewCellDelegate: self,
timelineMiddleLoaderTableViewCellDelegate: self
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)
}
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}
// MARK: - UIScrollViewDelegate
extension PublicTimelineViewController {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
handleScrollViewDidScroll(scrollView)
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}
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}
// MARK: - Selector
extension PublicTimelineViewController {
@objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
guard viewModel.stateMachine.enter(PublicTimelineViewModel.State.Loading.self) else {
sender.endRefreshing()
return
}
}
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}
// MARK: - UITableViewDelegate
extension PublicTimelineViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
guard let diffableDataSource = viewModel.diffableDataSource else { return 100 }
guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return 100 }
guard let frame = viewModel.cellFrameCache.object(forKey: NSNumber(value: item.hashValue))?.cgRectValue else {
return 200
}
return ceil(frame.height)
}
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func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {}
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func tableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
guard let diffableDataSource = viewModel.diffableDataSource else { return }
guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
let key = item.hashValue
let frame = cell.frame
viewModel.cellFrameCache.setObject(NSValue(cgRect: frame), forKey: NSNumber(value: key))
}
}
// MARK: - ContentOffsetAdjustableTimelineViewControllerDelegate
extension PublicTimelineViewController: ContentOffsetAdjustableTimelineViewControllerDelegate {
func navigationBar() -> UINavigationBar? {
return navigationController?.navigationBar
}
}
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// MARK: - LoadMoreConfigurableTableViewContainer
extension PublicTimelineViewController: LoadMoreConfigurableTableViewContainer {
typealias BottomLoaderTableViewCell = TimelineBottomLoaderTableViewCell
typealias LoadingState = PublicTimelineViewModel.State.LoadingMore
var loadMoreConfigurableTableView: UITableView { return tableView }
var loadMoreConfigurableStateMachine: GKStateMachine { return viewModel.stateMachine }
}
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// MARK: - TimelineMiddleLoaderTableViewCellDelegate
extension PublicTimelineViewController: TimelineMiddleLoaderTableViewCellDelegate {
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func configure(cell: TimelineMiddleLoaderTableViewCell, upperTimelineTootID: String?, timelineIndexobjectID: NSManagedObjectID?) {
guard let upperTimelineTootID = upperTimelineTootID else {return}
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viewModel.loadMiddleSateMachineList
.receive(on: DispatchQueue.main)
.sink { [weak self] ids in
guard let _ = self else { return }
if let stateMachine = ids[upperTimelineTootID] {
guard let state = stateMachine.currentState else {
assertionFailure()
return
}
// make success state same as loading due to snapshot updating delay
let isLoading = state is PublicTimelineViewModel.LoadMiddleState.Loading || state is PublicTimelineViewModel.LoadMiddleState.Success
cell.loadMoreButton.isHidden = isLoading
if isLoading {
cell.activityIndicatorView.startAnimating()
} else {
cell.activityIndicatorView.stopAnimating()
}
} else {
cell.loadMoreButton.isHidden = false
cell.activityIndicatorView.stopAnimating()
}
}
.store(in: &cell.disposeBag)
var dict = viewModel.loadMiddleSateMachineList.value
if let _ = dict[upperTimelineTootID] {
// do nothing
} else {
let stateMachine = GKStateMachine(states: [
PublicTimelineViewModel.LoadMiddleState.Initial(viewModel: viewModel, upperTimelineTootID: upperTimelineTootID),
PublicTimelineViewModel.LoadMiddleState.Loading(viewModel: viewModel, upperTimelineTootID: upperTimelineTootID),
PublicTimelineViewModel.LoadMiddleState.Fail(viewModel: viewModel, upperTimelineTootID: upperTimelineTootID),
PublicTimelineViewModel.LoadMiddleState.Success(viewModel: viewModel, upperTimelineTootID: upperTimelineTootID),
])
stateMachine.enter(PublicTimelineViewModel.LoadMiddleState.Initial.self)
dict[upperTimelineTootID] = stateMachine
viewModel.loadMiddleSateMachineList.value = dict
}
}
func timelineMiddleLoaderTableViewCell(_ cell: TimelineMiddleLoaderTableViewCell, loadMoreButtonDidPressed button: UIButton) {
guard let diffableDataSource = viewModel.diffableDataSource else { return }
guard let indexPath = tableView.indexPath(for: cell) else { return }
guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
switch item {
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case .publicMiddleLoader(let upper):
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guard let stateMachine = viewModel.loadMiddleSateMachineList.value[upper] else {
assertionFailure()
return
}
stateMachine.enter(PublicTimelineViewModel.LoadMiddleState.Loading.self)
default:
assertionFailure()
}
}
}