116 lines
4.5 KiB
Swift
116 lines
4.5 KiB
Swift
// Copyright © 2021 Metabolist. All rights reserved.
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import Combine
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import UIKit
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import ViewModels
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final class TimelinesViewController: UIPageViewController {
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private let segmentedControl = UISegmentedControl()
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private let timelineViewControllers: [TableViewController]
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private let viewModel: NavigationViewModel
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private let rootViewModel: RootViewModel
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private var cancellables = Set<AnyCancellable>()
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init(viewModel: NavigationViewModel, rootViewModel: RootViewModel) {
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self.viewModel = viewModel
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self.rootViewModel = rootViewModel
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var timelineViewControllers = [TableViewController]()
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for (index, timeline) in viewModel.timelines.enumerated() {
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timelineViewControllers.append(
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TableViewController(
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viewModel: viewModel.viewModel(timeline: timeline),
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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,
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navigationOrientation: .horizontal,
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options: [.interPageSpacing: CGFloat.defaultSpacing])
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if let firstViewController = timelineViewControllers.first {
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setViewControllers([firstViewController], direction: .forward, animated: false)
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}
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tabBarItem = UITabBarItem(
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title: NSLocalizedString("main-navigation.timelines", comment: ""),
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image: UIImage(systemName: "newspaper"),
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selectedImage: nil)
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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dataSource = self
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delegate = self
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navigationItem.titleView = segmentedControl
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segmentedControl.selectedSegmentIndex = 0
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segmentedControl.addAction(
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UIAction { [weak self] _ in
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guard let self = self,
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let currentViewController = self.viewControllers?.first as? TableViewController,
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let currentIndex = self.timelineViewControllers.firstIndex(of: currentViewController),
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self.segmentedControl.selectedSegmentIndex != currentIndex
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else { return }
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self.setViewControllers(
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[self.timelineViewControllers[self.segmentedControl.selectedSegmentIndex]],
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direction: self.segmentedControl.selectedSegmentIndex > currentIndex ? .forward : .reverse,
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animated: !UIAccessibility.isReduceMotionEnabled)
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},
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for: .valueChanged)
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}
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}
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extension TimelinesViewController: UIPageViewControllerDataSource {
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func pageViewController(_ pageViewController: UIPageViewController,
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viewControllerAfter viewController: UIViewController) -> UIViewController? {
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guard
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let timelineViewController = viewController as? TableViewController,
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let index = timelineViewControllers.firstIndex(of: timelineViewController),
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index + 1 < timelineViewControllers.count
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else { return nil }
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return timelineViewControllers[index + 1]
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}
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func pageViewController(_ pageViewController: UIPageViewController,
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viewControllerBefore viewController: UIViewController) -> UIViewController? {
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guard
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let timelineViewController = viewController as? TableViewController,
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let index = timelineViewControllers.firstIndex(of: timelineViewController),
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index > 0
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else { return nil }
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return timelineViewControllers[index - 1]
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}
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}
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extension TimelinesViewController: UIPageViewControllerDelegate {
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func pageViewController(_ pageViewController: UIPageViewController,
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didFinishAnimating finished: Bool,
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previousViewControllers: [UIViewController],
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transitionCompleted completed: Bool) {
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guard let viewController = viewControllers?.first as? TableViewController,
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let index = timelineViewControllers.firstIndex(of: viewController)
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else { return }
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segmentedControl.selectedSegmentIndex = index
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}
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}
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extension TimelinesViewController: ScrollableToTop {
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func scrollToTop(animated: Bool) {
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(viewControllers?.first as? TableViewController)?.scrollToTop(animated: animated)
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}
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}
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