92 lines
3.3 KiB
Swift
92 lines
3.3 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import UIKit
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import ViewModels
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final class ImagePageViewController: UIPageViewController {
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let imageViewControllers: [ImageViewController]
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init(initiallyVisible: AttachmentViewModel, statusViewModel: StatusViewModel) {
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imageViewControllers = statusViewModel.attachmentViewModels.map { ImageViewController(viewModel: $0) }
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super.init(
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transitionStyle: .scroll,
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navigationOrientation: .horizontal,
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options: [.interPageSpacing: CGFloat.defaultSpacing])
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let index = statusViewModel.attachmentViewModels.firstIndex {
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$0.attachment.id == initiallyVisible.attachment.id
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}
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setViewControllers([imageViewControllers[index ?? 0]], direction: .forward, animated: false)
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}
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init(imageURL: URL) {
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imageViewControllers = [ImageViewController(imageURL: imageURL)]
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super.init(
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transitionStyle: .scroll,
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navigationOrientation: .horizontal,
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options: [.interPageSpacing: CGFloat.defaultSpacing])
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setViewControllers(imageViewControllers, direction: .forward, animated: false)
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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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view.backgroundColor = .secondarySystemBackground
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view.subviews.compactMap { $0 as? UIScrollView }.first?.bounces = imageViewControllers.count > 1
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navigationItem.leftBarButtonItem = .init(
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systemItem: .close,
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primaryAction: UIAction { [weak self] _ in self?.presentingViewController?.dismiss(animated: true) })
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navigationController?.barHideOnTapGestureRecognizer.addTarget(
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self,
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action: #selector(toggleDescriptionVisibility))
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}
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override var prefersStatusBarHidden: Bool { navigationController?.isNavigationBarHidden ?? false }
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override var prefersHomeIndicatorAutoHidden: Bool { navigationController?.isNavigationBarHidden ?? false }
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}
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extension ImagePageViewController {
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@objc func toggleDescriptionVisibility() {
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for controller in imageViewControllers {
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controller.toggleDescriptionVisibility()
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}
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}
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}
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extension ImagePageViewController: 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 imageViewController = viewController as? ImageViewController,
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let index = imageViewControllers.firstIndex(of: imageViewController),
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index + 1 < imageViewControllers.count
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else { return nil }
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return imageViewControllers[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 imageViewController = viewController as? ImageViewController,
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let index = imageViewControllers.firstIndex(of: imageViewController),
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index > 0
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else { return nil }
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return imageViewControllers[index - 1]
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}
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}
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