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//
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// ChatLayout
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// ContainerCollectionReusableView.swift
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// https://github.com/ekazaev/ChatLayout
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//
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// Created by Eugene Kazaev in 2020-2023.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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/// A container `UICollectionReusableView` that constraints its contained view to its margins.
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public final class ContainerCollectionReusableView<CustomView: UIView>: UICollectionReusableView {
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/// Default reuse identifier is set with the class name.
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public static var reuseIdentifier: String {
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String(describing: self)
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}
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/// Contained view.
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public lazy var customView = CustomView(frame: bounds)
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/// An instance of `ContainerCollectionViewCellDelegate`
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public weak var delegate: ContainerCollectionViewCellDelegate?
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/// Initializes and returns a newly allocated view object with the specified frame rectangle.
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/// - Parameter frame: The frame rectangle for the view, measured in points. The origin of the frame is relative
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/// to the superview in which you plan to add it.
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override init(frame: CGRect) {
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super.init(frame: frame)
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setupSubviews()
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}
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@available(*, unavailable, message: "Use init(frame:) instead")
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/// This constructor is unavailable.
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public required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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/// Performs any clean up necessary to prepare the view for use again.
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public override func prepareForReuse() {
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super.prepareForReuse()
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delegate?.prepareForReuse()
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}
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/// Gives the cell a chance to modify the attributes provided by the layout object.
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/// - Parameter layoutAttributes: The attributes provided by the layout object. These attributes represent the values that the layout intends to apply to the cell.
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/// - Returns: Modified `UICollectionViewLayoutAttributes`
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public override func preferredLayoutAttributesFitting(_ layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes {
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guard let chatLayoutAttributes = layoutAttributes as? ChatLayoutAttributes else {
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return super.preferredLayoutAttributesFitting(layoutAttributes)
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}
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delegate?.apply(chatLayoutAttributes)
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let resultingLayoutAttributes: ChatLayoutAttributes
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if let preferredLayoutAttributes = delegate?.preferredLayoutAttributesFitting(chatLayoutAttributes) {
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resultingLayoutAttributes = preferredLayoutAttributes
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} else if let chatLayoutAttributes = super.preferredLayoutAttributesFitting(chatLayoutAttributes) as? ChatLayoutAttributes {
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delegate?.modifyPreferredLayoutAttributesFitting(chatLayoutAttributes)
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resultingLayoutAttributes = chatLayoutAttributes
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} else {
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resultingLayoutAttributes = chatLayoutAttributes
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}
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return resultingLayoutAttributes
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}
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/// Applies the specified layout attributes to the view.
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/// - Parameter layoutAttributes: The layout attributes to apply.
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public override func apply(_ layoutAttributes: UICollectionViewLayoutAttributes) {
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guard let chatLayoutAttributes = layoutAttributes as? ChatLayoutAttributes else {
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return
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}
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super.apply(layoutAttributes)
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delegate?.apply(chatLayoutAttributes)
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}
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private func setupSubviews() {
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addSubview(customView)
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insetsLayoutMarginsFromSafeArea = false
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layoutMargins = .zero
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customView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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customView.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
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customView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor),
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customView.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
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customView.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor)
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])
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}
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}
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