metatext/Views/UIKit/AttachmentView.swift

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Swift
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// Copyright © 2020 Metabolist. All rights reserved.
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import AVKit
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import BlurHash
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import Combine
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import SDWebImage
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import UIKit
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import ViewModels
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final class AttachmentView: UIView {
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let playerView = PlayerView()
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let imageView = SDAnimatedImageView()
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let removeButton = UIButton(type: .close)
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let uncaptionedLabel = CapsuleLabel()
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let selectionButton = UIButton()
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var playing: Bool = false {
didSet {
if playing {
play()
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imageView.tag = 0
playerView.tag = viewModel.tag
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} else {
stop()
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imageView.tag = viewModel.tag
playerView.tag = 0
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}
}
}
private let viewModel: AttachmentViewModel
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private let parentViewModel: AttachmentsRenderingViewModel
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private var playerCancellable: AnyCancellable?
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init(viewModel: AttachmentViewModel, parentViewModel: AttachmentsRenderingViewModel) {
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self.viewModel = viewModel
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self.parentViewModel = parentViewModel
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super.init(frame: .zero)
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initialSetup()
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
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override func layoutSubviews() {
super.layoutSubviews()
if let focus = viewModel.attachment.meta?.focus {
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let viewsAndMediaSizes: [(UIView, CGSize?)] = [
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(imageView, imageView.image?.size),
(playerView, playerView.player?.currentItem?.presentationSize)]
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for (view, mediaSize) in viewsAndMediaSizes {
guard let size = mediaSize else { continue }
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view.setContentsRect(focus: focus, mediaSize: size)
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}
}
}
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}
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extension AttachmentView {
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func play() {
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let player = PlayerCache.shared.player(url: viewModel.attachment.url.url)
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playerCancellable = NotificationCenter.default.publisher(
for: .AVPlayerItemDidPlayToEndTime,
object: player.currentItem)
.sink { _ in
player.currentItem?.seek(to: .zero) { success in
guard success else { return }
player.play()
}
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}
player.isMuted = true
player.play()
playerView.player = player
playerView.isHidden = false
}
func stop() {
if let item = playerView.player?.currentItem {
let imageGenerator = AVAssetImageGenerator(asset: item.asset)
imageGenerator.requestedTimeToleranceAfter = .zero
imageGenerator.requestedTimeToleranceBefore = .zero
if let image = try? imageGenerator.copyCGImage(at: item.currentTime(), actualTime: nil) {
imageView.image = .init(cgImage: image)
}
}
playerView.player = nil
playerView.isHidden = true
}
func selectAttachment() {
parentViewModel.attachmentSelected(viewModel: viewModel)
}
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}
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private extension AttachmentView {
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// swiftlint:disable:next function_body_length
func initialSetup() {
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addSubview(imageView)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
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imageView.autoPlayAnimatedImage = false
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imageView.tag = viewModel.tag
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let blurEffect = UIBlurEffect(style: .systemUltraThinMaterial)
let playView = UIVisualEffectView(effect: blurEffect)
let playVibrancyView = UIVisualEffectView(effect: UIVibrancyEffect(blurEffect: blurEffect))
let playImageView = UIImageView(
image: UIImage(systemName: "play.circle",
withConfiguration: UIImage.SymbolConfiguration(textStyle: .largeTitle)))
playImageView.translatesAutoresizingMaskIntoConstraints = false
playVibrancyView.translatesAutoresizingMaskIntoConstraints = false
playVibrancyView.contentView.addSubview(playImageView)
playView.contentView.addSubview(playVibrancyView)
addSubview(playView)
playView.translatesAutoresizingMaskIntoConstraints = false
playView.clipsToBounds = true
playView.layer.cornerRadius = .defaultCornerRadius
playView.isHidden = viewModel.attachment.type == .image
addSubview(playerView)
playerView.translatesAutoresizingMaskIntoConstraints = false
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playerView.videoGravity = .resizeAspectFill
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playerView.isHidden = true
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addSubview(selectionButton)
selectionButton.translatesAutoresizingMaskIntoConstraints = false
selectionButton.setBackgroundImage(.highlightedButtonBackground, for: .highlighted)
selectionButton.addAction(
UIAction { [weak self] _ in self?.selectAttachment() },
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for: .touchUpInside)
selectionButton.accessibilityLabel = NSLocalizedString("compose.attachment.edit", comment: "")
if let description = viewModel.attachment.description, !description.isEmpty {
selectionButton.accessibilityLabel?.appendWithSeparator(description)
}
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addSubview(removeButton)
removeButton.translatesAutoresizingMaskIntoConstraints = false
removeButton.showsMenuAsPrimaryAction = true
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removeButton.accessibilityLabel = NSLocalizedString("compose.attachment.remove", comment: "")
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removeButton.menu = UIMenu(
children: [
UIAction(
title: NSLocalizedString("remove", comment: ""),
image: UIImage(systemName: "trash"),
attributes: .destructive) { [weak self] _ in
guard let self = self else { return }
self.parentViewModel.removeAttachment(viewModel: self.viewModel)
}])
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addSubview(uncaptionedLabel)
uncaptionedLabel.translatesAutoresizingMaskIntoConstraints = false
uncaptionedLabel.text = NSLocalizedString("compose.attachment.uncaptioned", comment: "")
uncaptionedLabel.isHidden = !(parentViewModel.canRemoveAttachments
&& (viewModel.attachment.description?.isEmpty ?? true))
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switch viewModel.attachment.type {
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case .image, .video, .gifv:
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let placeholderImage: UIImage?
if let blurHash = viewModel.attachment.blurhash {
placeholderImage = UIImage(blurHash: blurHash, size: .blurHashSize)
} else {
placeholderImage = nil
}
imageView.sd_setImage(
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with: viewModel.attachment.previewUrl?.url,
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placeholderImage: placeholderImage) { [weak self] _, _, _, _ in
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self?.layoutSubviews()
}
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case .audio:
playImageView.image = UIImage(systemName: "waveform.circle",
withConfiguration: UIImage.SymbolConfiguration(textStyle: .largeTitle))
backgroundColor = .secondarySystemBackground
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case .unknown:
playImageView.image = UIImage(systemName: "link",
withConfiguration: UIImage.SymbolConfiguration(textStyle: .largeTitle))
backgroundColor = .secondarySystemBackground
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}
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NSLayoutConstraint.activate([
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imageView.leadingAnchor.constraint(equalTo: leadingAnchor),
imageView.trailingAnchor.constraint(equalTo: trailingAnchor),
imageView.topAnchor.constraint(equalTo: topAnchor),
imageView.bottomAnchor.constraint(equalTo: bottomAnchor),
playerView.leadingAnchor.constraint(equalTo: leadingAnchor),
playerView.trailingAnchor.constraint(equalTo: trailingAnchor),
playerView.topAnchor.constraint(equalTo: topAnchor),
playerView.bottomAnchor.constraint(equalTo: bottomAnchor),
playImageView.centerXAnchor.constraint(equalTo: playView.contentView.centerXAnchor),
playImageView.centerYAnchor.constraint(equalTo: playView.contentView.centerYAnchor),
playVibrancyView.leadingAnchor.constraint(equalTo: playView.leadingAnchor),
playVibrancyView.topAnchor.constraint(equalTo: playView.topAnchor),
playVibrancyView.trailingAnchor.constraint(equalTo: playView.trailingAnchor),
playVibrancyView.bottomAnchor.constraint(equalTo: playView.bottomAnchor),
playView.centerXAnchor.constraint(equalTo: centerXAnchor),
playView.centerYAnchor.constraint(equalTo: centerYAnchor),
playView.trailingAnchor.constraint(
equalTo: playImageView.trailingAnchor, constant: .compactSpacing),
playView.bottomAnchor.constraint(
equalTo: playImageView.bottomAnchor, constant: .compactSpacing),
playImageView.topAnchor.constraint(
equalTo: playView.topAnchor, constant: .compactSpacing),
playImageView.leadingAnchor.constraint(
equalTo: playView.leadingAnchor, constant: .compactSpacing),
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selectionButton.leadingAnchor.constraint(equalTo: leadingAnchor),
selectionButton.trailingAnchor.constraint(equalTo: trailingAnchor),
selectionButton.topAnchor.constraint(equalTo: topAnchor),
selectionButton.bottomAnchor.constraint(equalTo: bottomAnchor),
removeButton.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
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removeButton.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor),
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uncaptionedLabel.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
uncaptionedLabel.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor)
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])
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var accessibilityLabel = viewModel.attachment.type.accessibilityName
if let description = viewModel.attachment.description {
accessibilityLabel.appendWithSeparator(description)
}
self.accessibilityLabel = accessibilityLabel
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}
}