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281 lines
12 KiB
Swift
281 lines
12 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import AVFoundation
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import BlurHash
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import Mastodon
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import SDWebImage
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import UIKit
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import ViewModels
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enum ImageError: Error {
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case unableToLoad
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}
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extension ImageError: LocalizedError {
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var errorDescription: String? {
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switch self {
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case .unableToLoad:
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return NSLocalizedString("image-error.unable-to-load", comment: "")
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}
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}
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}
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final class ImageViewController: UIViewController {
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let scrollView = UIScrollView()
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let imageView = SDAnimatedImageView()
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let playerView = PlayerView()
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private let viewModel: AttachmentViewModel?
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private let imageURL: URL?
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private let contentView = UIView()
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private let descriptionBackgroundView = UIVisualEffectView(effect: UIBlurEffect(style: .systemChromeMaterial))
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private let descriptionTextView = UITextView()
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init(viewModel: AttachmentViewModel? = nil, imageURL: URL? = nil) {
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self.viewModel = viewModel
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self.imageURL = imageURL
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super.init(nibName: nil, bundle: 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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// swiftlint:disable:next function_body_length
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override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = .secondarySystemBackground
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view.addSubview(scrollView)
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scrollView.delegate = self
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scrollView.translatesAutoresizingMaskIntoConstraints = false
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scrollView.showsHorizontalScrollIndicator = false
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scrollView.showsVerticalScrollIndicator = false
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scrollView.maximumZoomScale = Self.maximumZoomScale
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let doubleTapGestureRecognizer = UITapGestureRecognizer(
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target: self,
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action: #selector(handleDoubleTap(gestureRecognizer:)))
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doubleTapGestureRecognizer.numberOfTapsRequired = 2
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scrollView.addGestureRecognizer(doubleTapGestureRecognizer)
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contentView.translatesAutoresizingMaskIntoConstraints = false
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scrollView.addSubview(contentView)
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contentView.addSubview(imageView)
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imageView.translatesAutoresizingMaskIntoConstraints = false
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imageView.contentMode = .scaleAspectFit
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imageView.sd_imageIndicator = SDWebImageActivityIndicator.large
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imageView.autoPlayAnimatedImage = false
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contentView.addSubview(playerView)
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playerView.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(descriptionBackgroundView)
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descriptionBackgroundView.translatesAutoresizingMaskIntoConstraints = false
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descriptionBackgroundView.isHidden = viewModel?.attachment.description == nil
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|| viewModel?.attachment.description == ""
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descriptionBackgroundView.contentView.addSubview(descriptionTextView)
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descriptionTextView.translatesAutoresizingMaskIntoConstraints = false
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descriptionTextView.backgroundColor = .clear
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descriptionTextView.font = .preferredFont(forTextStyle: .caption1)
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descriptionTextView.adjustsFontForContentSizeCategory = true
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descriptionTextView.text = viewModel?.attachment.description
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descriptionTextView.isScrollEnabled = false
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descriptionTextView.isEditable = false
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NSLayoutConstraint.activate([
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scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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scrollView.topAnchor.constraint(equalTo: view.topAnchor),
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scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
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contentView.topAnchor.constraint(equalTo: scrollView.topAnchor),
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contentView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),
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contentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
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contentView.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor),
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contentView.centerYAnchor.constraint(equalTo: scrollView.centerYAnchor),
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imageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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imageView.topAnchor.constraint(equalTo: contentView.topAnchor),
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imageView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
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imageView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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playerView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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playerView.topAnchor.constraint(equalTo: contentView.topAnchor),
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playerView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
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playerView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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descriptionBackgroundView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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descriptionBackgroundView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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descriptionBackgroundView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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descriptionTextView.leadingAnchor.constraint(
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equalTo: descriptionBackgroundView.layoutMarginsGuide.leadingAnchor),
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descriptionTextView.topAnchor.constraint(equalTo: descriptionBackgroundView.topAnchor),
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descriptionTextView.trailingAnchor.constraint(
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equalTo: descriptionBackgroundView.layoutMarginsGuide.trailingAnchor),
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descriptionTextView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
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])
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if let viewModel = viewModel {
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switch viewModel.attachment.type {
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case .image:
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imageView.tag = viewModel.tag
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playerView.isHidden = true
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let placeholderImage: UIImage?
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let cachedImageKey = viewModel.attachment.previewUrl?.absoluteString
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let cachedImage = SDImageCache.shared.imageFromCache(forKey: cachedImageKey)
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if cachedImage != nil {
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placeholderImage = cachedImage
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} else if let blurHash = viewModel.attachment.blurhash {
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placeholderImage = UIImage(blurHash: blurHash, size: .blurHashSize)
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} else {
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placeholderImage = nil
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}
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imageView.sd_setImage(with: viewModel.attachment.url,
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placeholderImage: placeholderImage) { _, error, _, _ in
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if error != nil {
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let alertItem = AlertItem(error: ImageError.unableToLoad)
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self.present(alertItem: alertItem)
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}
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}
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case .gifv:
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playerView.tag = viewModel.tag
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imageView.isHidden = true
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let player = PlayerCache.shared.player(url: viewModel.attachment.url)
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player.isMuted = true
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playerView.player = player
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player.play()
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default: break
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}
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var accessibilityLabel = viewModel.attachment.type.accessibilityName
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if let description = viewModel.attachment.description {
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accessibilityLabel.appendWithSeparator(description)
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}
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} else if let imageURL = imageURL {
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imageView.tag = imageURL.hashValue
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playerView.isHidden = true
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imageView.sd_setImage(with: imageURL)
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}
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contentView.accessibilityLabel = viewModel?.attachment.type.accessibilityName
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?? Attachment.AttachmentType.image.accessibilityName
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contentView.isAccessibilityElement = true
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}
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}
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extension ImageViewController {
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func toggleDescriptionVisibility() {
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UIView.animate(withDuration: .shortAnimationDuration) {
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self.descriptionBackgroundView.alpha = self.descriptionBackgroundView.alpha > 0 ? 0 : 1
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}
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}
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func presentActivityViewController() {
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if let image = imageView.image {
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let activityViewController = UIActivityViewController(activityItems: [image], applicationActivities: [])
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if UIDevice.current.userInterfaceIdiom == .pad {
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activityViewController.popoverPresentationController?
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.barButtonItem = parent?.navigationItem.rightBarButtonItem
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}
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present(activityViewController, animated: true)
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} else if let asset = playerView.player?.currentItem?.asset as? AVURLAsset {
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asset.exportWithoutAudioTrack { result in
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DispatchQueue.main.async {
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switch result {
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case let .success(url):
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let activityViewController = UIActivityViewController(
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activityItems: [url],
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applicationActivities: [])
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if UIDevice.current.userInterfaceIdiom == .pad {
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activityViewController.popoverPresentationController?
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.barButtonItem = self.parent?.navigationItem.rightBarButtonItem
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}
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activityViewController.completionWithItemsHandler = { _, _, _, _ in
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try? FileManager.default.removeItem(at: url.deletingLastPathComponent())
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}
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self.present(activityViewController, animated: true)
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case .failure:
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let alertController = UIAlertController(
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title: nil,
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message: NSLocalizedString("attachment.unable-to-export-media", comment: ""),
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preferredStyle: .alert)
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let okAction = UIAlertAction(
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title: NSLocalizedString("ok", comment: ""),
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style: .default) { _ in }
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alertController.addAction(okAction)
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self.present(alertController, animated: true)
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}
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}
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}
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}
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}
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}
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extension ImageViewController: UIScrollViewDelegate {
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func viewForZooming(in scrollView: UIScrollView) -> UIView? {
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contentView
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}
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// https://stackoverflow.com/a/40480610/2484482
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func scrollViewDidZoom(_ scrollView: UIScrollView) {
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if scrollView.zoomScale > 1,
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let contentSize = imageView.image?.size ?? playerView.player?.currentItem?.presentationSize {
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let ratio = min(contentView.frame.width / contentSize.width, contentView.frame.height / contentSize.height)
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let newWidth = contentSize.width * ratio
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let newHeight = contentSize.height * ratio
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let horizontalInset = 0.5 * (newWidth * scrollView.zoomScale > contentView.frame.width
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? (newWidth - contentView.frame.width)
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: (scrollView.frame.width - scrollView.contentSize.width))
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let verticalInset = 0.5 * (newHeight * scrollView.zoomScale > contentView.frame.height
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? (newHeight - contentView.frame.height)
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: (scrollView.frame.height - scrollView.contentSize.height))
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scrollView.contentInset = .init(
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top: verticalInset,
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left: horizontalInset,
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bottom: verticalInset,
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right: horizontalInset)
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} else {
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scrollView.contentInset = .zero
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}
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}
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}
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private extension ImageViewController {
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static let maximumZoomScale: CGFloat = 4
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@objc func handleDoubleTap(gestureRecognizer: UITapGestureRecognizer) {
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if scrollView.zoomScale == scrollView.minimumZoomScale {
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let width = contentView.frame.size.width / scrollView.maximumZoomScale
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let height = contentView.frame.size.height / scrollView.maximumZoomScale
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let center = scrollView.convert(gestureRecognizer.location(in: gestureRecognizer.view), from: contentView)
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scrollView.zoom(
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to: CGRect(x: center.x - (width / 2), y: center.y - (height / 2), width: width, height: height),
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animated: true)
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} else {
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scrollView.setZoomScale(scrollView.minimumZoomScale, animated: true)
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}
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}
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}
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