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 StatusAttachmentsView: UIView {
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private let containerStackView = UIStackView()
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private let leftStackView = UIStackView()
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private let rightStackView = UIStackView()
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private var aspectRatioConstraint: NSLayoutConstraint?
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var attachmentViewModels = [AttachmentViewModel]() {
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didSet {
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for stackView in [leftStackView, rightStackView] {
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for view in stackView.arrangedSubviews {
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stackView.removeArrangedSubview(view)
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view.removeFromSuperview()
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}
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}
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let attachmentCount = attachmentViewModels.count
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rightStackView.isHidden = attachmentCount == 1
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for (index, viewModel) in attachmentViewModels.enumerated() {
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let attachmentView = StatusAttachmentView(viewModel: viewModel)
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if attachmentCount == 2 && index == 1
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|| attachmentCount == 3 && index != 0
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|| attachmentCount > 3 && index % 2 != 0 {
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rightStackView.addArrangedSubview(attachmentView)
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} else {
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leftStackView.addArrangedSubview(attachmentView)
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}
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}
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let newAspectRatio: CGFloat
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if attachmentViewModels.count == 1, let aspectRatio = attachmentViewModels.first?.aspectRatio {
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newAspectRatio = max(CGFloat(aspectRatio), 16 / 9)
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} else {
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newAspectRatio = 16 / 9
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}
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aspectRatioConstraint?.isActive = false
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aspectRatioConstraint = widthAnchor.constraint(equalTo: heightAnchor, multiplier: newAspectRatio)
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aspectRatioConstraint?.priority = .justBelowMax
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aspectRatioConstraint?.isActive = true
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}
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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initializationActions()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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initializationActions()
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}
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}
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private extension StatusAttachmentsView {
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func initializationActions() {
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backgroundColor = .clear
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layoutMargins = .zero
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clipsToBounds = true
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layer.cornerRadius = .defaultCornerRadius
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addSubview(containerStackView)
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containerStackView.translatesAutoresizingMaskIntoConstraints = false
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containerStackView.distribution = .fillEqually
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containerStackView.spacing = .compactSpacing
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leftStackView.distribution = .fillEqually
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leftStackView.spacing = .compactSpacing
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leftStackView.axis = .vertical
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rightStackView.distribution = .fillEqually
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rightStackView.spacing = .compactSpacing
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rightStackView.axis = .vertical
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containerStackView.addArrangedSubview(leftStackView)
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containerStackView.addArrangedSubview(rightStackView)
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NSLayoutConstraint.activate([
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containerStackView.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
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containerStackView.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor),
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containerStackView.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
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containerStackView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor)
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])
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}
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}
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