metatext/View Controllers/TimelinesViewController.swift

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// Copyright © 2021 Metabolist. All rights reserved.
import Combine
import UIKit
import ViewModels
final class TimelinesViewController: UIPageViewController {
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private let segmentedControl = UISegmentedControl()
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private let announcementsButton = UIBarButtonItem()
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private let timelineViewControllers: [TableViewController]
private let viewModel: NavigationViewModel
private let rootViewModel: RootViewModel
private var cancellables = Set<AnyCancellable>()
init(viewModel: NavigationViewModel, rootViewModel: RootViewModel) {
self.viewModel = viewModel
self.rootViewModel = rootViewModel
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var timelineViewControllers = [TableViewController]()
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for (index, timeline) in viewModel.timelines.enumerated() {
timelineViewControllers.append(
TableViewController(
viewModel: viewModel.viewModel(timeline: timeline),
rootViewModel: rootViewModel))
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segmentedControl.insertSegment(withTitle: timeline.title, at: index, animated: false)
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}
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self.timelineViewControllers = timelineViewControllers
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super.init(transitionStyle: .scroll,
navigationOrientation: .horizontal,
options: [.interPageSpacing: CGFloat.defaultSpacing])
if let firstViewController = timelineViewControllers.first {
setViewControllers([firstViewController], direction: .forward, animated: false)
}
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tabBarItem = UITabBarItem(
title: NSLocalizedString("main-navigation.timelines", comment: ""),
image: UIImage(systemName: "newspaper"),
selectedImage: nil)
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let announcementsAction = UIAction(
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title: NSLocalizedString("main-navigation.announcements", comment: ""),
image: UIImage(systemName: "megaphone")) { [weak self] _ in
guard let self = self else { return }
let announcementsViewController = TableViewController(viewModel: viewModel.announcementsViewModel(),
rootViewModel: rootViewModel)
self.navigationController?.pushViewController(announcementsViewController, animated: true)
}
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announcementsButton.primaryAction = announcementsAction
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viewModel.$announcementCount
.sink { [weak self] in
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if $0.unread > 0 {
announcementsAction.image = UIImage(systemName: "\($0.unread).circle.fill")
?? UIImage(systemName: "megaphone.fill")
self?.announcementsButton.primaryAction = announcementsAction
self?.announcementsButton.tintColor = .systemRed
} else {
announcementsAction.image = UIImage(systemName: "megaphone")
self?.announcementsButton.primaryAction = announcementsAction
self?.announcementsButton.tintColor = nil
}
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self?.navigationItem.rightBarButtonItem = $0.total > 0 ? self?.announcementsButton : nil
}
.store(in: &cancellables)
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}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
delegate = self
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navigationItem.titleView = segmentedControl
segmentedControl.selectedSegmentIndex = 0
segmentedControl.addAction(
UIAction { [weak self] _ in
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guard let self = self,
let currentViewController = self.viewControllers?.first as? TableViewController,
let currentIndex = self.timelineViewControllers.firstIndex(of: currentViewController),
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self.segmentedControl.selectedSegmentIndex != currentIndex
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else { return }
self.setViewControllers(
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[self.timelineViewControllers[self.segmentedControl.selectedSegmentIndex]],
direction: self.segmentedControl.selectedSegmentIndex > currentIndex ? .forward : .reverse,
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animated: !UIAccessibility.isReduceMotionEnabled)
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},
for: .valueChanged)
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}
}
extension TimelinesViewController: UIPageViewControllerDataSource {
func pageViewController(_ pageViewController: UIPageViewController,
viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard
let timelineViewController = viewController as? TableViewController,
let index = timelineViewControllers.firstIndex(of: timelineViewController),
index + 1 < timelineViewControllers.count
else { return nil }
return timelineViewControllers[index + 1]
}
func pageViewController(_ pageViewController: UIPageViewController,
viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard
let timelineViewController = viewController as? TableViewController,
let index = timelineViewControllers.firstIndex(of: timelineViewController),
index > 0
else { return nil }
return timelineViewControllers[index - 1]
}
}
extension TimelinesViewController: UIPageViewControllerDelegate {
func pageViewController(_ pageViewController: UIPageViewController,
didFinishAnimating finished: Bool,
previousViewControllers: [UIViewController],
transitionCompleted completed: Bool) {
guard let viewController = viewControllers?.first as? TableViewController,
let index = timelineViewControllers.firstIndex(of: viewController)
else { return }
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segmentedControl.selectedSegmentIndex = index
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}
}
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extension TimelinesViewController: ScrollableToTop {
func scrollToTop(animated: Bool) {
(viewControllers?.first as? TableViewController)?.scrollToTop(animated: animated)
}
}
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extension TimelinesViewController: NavigationHandling {
func handle(navigation: Navigation) {
(viewControllers?.first as? TableViewController)?.handle(navigation: navigation)
}
}