metatext/View Controllers/TimelinesViewController.swift
2021-01-30 14:34:58 -08:00

109 lines
4.3 KiB
Swift

// Copyright © 2021 Metabolist. All rights reserved.
import Combine
import UIKit
import ViewModels
final class TimelinesViewController: UIPageViewController {
private let segmentedControl = UISegmentedControl()
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
var timelineViewControllers = [TableViewController]()
for (index, timeline) in viewModel.timelines.enumerated() {
timelineViewControllers.append(
TableViewController(
viewModel: viewModel.viewModel(timeline: timeline),
rootViewModel: rootViewModel))
segmentedControl.insertSegment(withTitle: timeline.title, at: index, animated: false)
}
self.timelineViewControllers = timelineViewControllers
super.init(transitionStyle: .scroll,
navigationOrientation: .horizontal,
options: [.interPageSpacing: CGFloat.defaultSpacing])
if let firstViewController = timelineViewControllers.first {
setViewControllers([firstViewController], direction: .forward, animated: false)
}
tabBarItem = UITabBarItem(
title: NSLocalizedString("main-navigation.timelines", comment: ""),
image: UIImage(systemName: "newspaper"),
selectedImage: nil)
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
delegate = self
navigationItem.titleView = segmentedControl
segmentedControl.selectedSegmentIndex = 0
segmentedControl.addAction(
UIAction { [weak self] _ in
guard let self = self,
let currentViewController = self.viewControllers?.first as? TableViewController,
let currentIndex = self.timelineViewControllers.firstIndex(of: currentViewController),
self.segmentedControl.selectedSegmentIndex != currentIndex
else { return }
self.setViewControllers(
[self.timelineViewControllers[self.segmentedControl.selectedSegmentIndex]],
direction: self.segmentedControl.selectedSegmentIndex > currentIndex ? .forward : .reverse,
animated: !UIAccessibility.isReduceMotionEnabled)
},
for: .valueChanged)
}
}
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 }
segmentedControl.selectedSegmentIndex = index
}
}