105 lines
3.7 KiB
Swift
105 lines
3.7 KiB
Swift
//
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// SegmentedPageViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 9/13/19.
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// Copyright © 2019 Shadowfacts. All rights reserved.
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//
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import UIKit
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class SegmentedPageViewController: UIPageViewController, UIPageViewControllerDelegate {
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let titles: [String]
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let pageControllers: [UIViewController]
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private(set) var currentIndex: Int!
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var segmentedControl: UISegmentedControl!
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init(titles: [String], pageControllers: [UIViewController]) {
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self.titles = titles
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self.pageControllers = pageControllers
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super.init(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
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self.delegate = self
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}
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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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view.backgroundColor = .systemBackground
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segmentedControl = UISegmentedControl(items: titles)
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segmentedControl.addTarget(self, action: #selector(segmentedControlChanged), for: .valueChanged)
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navigationItem.titleView = segmentedControl
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segmentedControl.selectedSegmentIndex = 0
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selectPage(at: 0, animated: false)
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addKeyCommand(MenuController.prevSubTabCommand)
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addKeyCommand(MenuController.nextSubTabCommand)
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// disable the transparent nav bar because it gets messy with multiple pages at different scroll positions
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if let nav = navigationController {
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let appearance = UINavigationBarAppearance()
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appearance.configureWithDefaultBackground()
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nav.navigationBar.scrollEdgeAppearance = appearance
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}
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}
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func selectPage(at index: Int, animated: Bool) {
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let direction: UIPageViewController.NavigationDirection = currentIndex == nil ? .forward : index - currentIndex > 0 ? .forward : .reverse
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setViewControllers([pageControllers[index]], direction: direction, animated: animated)
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navigationItem.title = pageControllers[index].title
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currentIndex = index
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segmentedControl.selectedSegmentIndex = index
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}
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@objc func segmentedControlChanged() {
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selectPage(at: segmentedControl.selectedSegmentIndex, animated: true)
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UIImpactFeedbackGenerator(style: .light).impactOccurred()
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}
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// MARK: - Page View Controller Delegate
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func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
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currentIndex = pageControllers.firstIndex(of: viewControllers!.first!)!
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segmentedControl.selectedSegmentIndex = currentIndex
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navigationItem.title = viewControllers!.first!.title
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}
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}
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extension SegmentedPageViewController: TabBarScrollableViewController {
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func tabBarScrollToTop() {
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if let scrollableVC = pageControllers[currentIndex] as? TabBarScrollableViewController {
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scrollableVC.tabBarScrollToTop()
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}
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}
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}
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extension SegmentedPageViewController: TabbedPageViewController {
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func selectNextPage() {
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guard currentIndex < pageControllers.count - 1 else { return }
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selectPage(at: currentIndex + 1, animated: true)
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}
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func selectPrevPage() {
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guard currentIndex > 0 else { return }
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selectPage(at: currentIndex - 1, animated: true)
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}
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}
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extension SegmentedPageViewController: BackgroundableViewController {
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func sceneDidEnterBackground() {
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if let current = pageControllers[currentIndex] as? BackgroundableViewController {
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current.sceneDidEnterBackground()
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}
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}
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}
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