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‎Package.swift

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// swift-tools-version:5.3
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// The swift-tools-version declares the minimum version of Swift required to build this package.
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import PackageDescription
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let package = Package(
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name: "ListKit",
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platforms: [
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.iOS(.v13)
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],
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products: [
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.library(
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name: "ListKit",
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targets: ["ListKit"]),
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],
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dependencies: [
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],
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targets: [
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.target(
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name: "ListKit",
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dependencies: []),
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.testTarget(
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name: "ListKitTests",
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dependencies: ["ListKit"]),
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]
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)

‎Sources/ListKit/Builders/GroupBuilder.swift

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//
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// GroupBuilder.swift
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// ListKit
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//
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// Created by burt on 2021/09/12.
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//
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import UIKit
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public struct GroupBuilderResult {
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public let group: NSCollectionLayoutGroup
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public let items: [NSCollectionLayoutItem]
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}
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@resultBuilder
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public struct GroupBuilder {
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public static func buildBlock(_ components: NSCollectionLayoutGroupConvertible...) -> GroupBuilderResult {
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precondition(components.count == 1, "Section contains only one Group!")
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guard let group = components.first else {
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fatalError("Section must have only one root Group!")
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}
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return GroupBuilderResult(group: group.toNSCollectionLayoutGroup(), items: group.items)
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}
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public static func buildFinalResult(_ component: GroupBuilderResult) -> GroupBuilderResult {
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return component
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}
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/// support if block
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public static func buildOptional(_ component: [NSCollectionLayoutGroupConvertible]?) -> [GroupBuilderResult] {
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return component?.compactMap { GroupBuilderResult(group: $0.toNSCollectionLayoutGroup(), items: $0.items) } ?? []
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}
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/// support if-else block (if)
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public static func buildEither(first component: GroupBuilderResult) -> GroupBuilderResult {
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return component
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}
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/// support if-else block (else)
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public static func buildEither(second component: GroupBuilderResult) -> GroupBuilderResult {
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return component
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}
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/// GroupBuilder does not support for-in loop
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}

‎Sources/ListKit/Builders/ItemBuilder.swift

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//
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// ItemBuilder.swift
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// ListKit
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//
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// Created by burt on 2021/09/12.
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//
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import UIKit
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@resultBuilder
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public struct ItemBuilder {
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public static func buildBlock(_ components: NSCollectionLayoutItemsConvertible...) -> [NSCollectionLayoutItem] {
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return components.flatMap { $0.toNSCollectionLayoutItems() }
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}
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public static func buildFinalResult(_ component: [NSCollectionLayoutItem]) -> [NSCollectionLayoutItem] {
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return component
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}
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/// support if block
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public static func buildOptional(_ component: [NSCollectionLayoutItemsConvertible]?) -> [NSCollectionLayoutItem] {
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return component?.flatMap { $0.toNSCollectionLayoutItems() } ?? []
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}
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/// support if-else block (if)
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public static func buildEither(first component: [NSCollectionLayoutItemsConvertible]) -> [NSCollectionLayoutItem] {
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return component.flatMap { $0.toNSCollectionLayoutItems() }
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}
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/// support if-else block (else)
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public static func buildEither(second component: [NSCollectionLayoutItemsConvertible]) -> [NSCollectionLayoutItem] {
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return component.flatMap { $0.toNSCollectionLayoutItems() }
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}
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/// support for-in loop
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public static func buildArray(_ components: [NSCollectionLayoutItemsConvertible]) -> [NSCollectionLayoutItem] {
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return components.flatMap { $0.toNSCollectionLayoutItems() }
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}
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}

‎Sources/ListKit/Builders/SectionBuilder.swift

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//
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// SectionBuilder.swift
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// ListKit
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//
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// Created by burt on 2021/09/12.
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//
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import UIKit
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public class SectionBuilderResult: NSObject {
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public let sections: [Section]
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public let nsSections: [NSCollectionLayoutSection]
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public init(sections: [Section], nsSections: [NSCollectionLayoutSection]) {
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self.sections = sections
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self.nsSections = nsSections
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}
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}
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@resultBuilder
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public struct SectionBuilder {
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public static func buildBlock(_ components: NSCollectionLayoutSectionConvertible...) -> [SectionBuilderResult] {
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return components.compactMap { SectionBuilderResult(sections: $0.sections, nsSections: $0.toNSCollectionLayoutSections()) }
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}
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public static func buildFinalResult(_ component: [SectionBuilderResult]) -> [SectionBuilderResult] {
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return component
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}
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/// support if block
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public static func buildOptional(_ component: [SectionBuilderResult]?) -> [SectionBuilderResult] {
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return component ?? []
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}
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/// support if-else block (if)
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public static func buildEither(first component: [SectionBuilderResult]) -> [SectionBuilderResult] {
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return component
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}
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/// support if-else block (else)
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public static func buildEither(second component: [SectionBuilderResult]) -> [SectionBuilderResult] {
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return component
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}
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/// support for-in loop
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public static func buildArray(_ components: [[SectionBuilderResult]]) -> [SectionBuilderResult] {
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let result = components.flatMap { $0 }
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return result
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}
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}

‎Sources/ListKit/Cell/ListKitCell.swift

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//
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// ListKitCell.swift
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// ListKit
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//
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// Created by burt on 2021/09/11.
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//
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import UIKit
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internal class ListKitCell: UICollectionViewCell {
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}
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extension ListKitCell {
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static var className: String {
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return String(reflecting: Self.self)
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}
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internal override var reuseIdentifier: String? {
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return Self.className
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}
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}

‎Sources/ListKit/Cell/ListKitReusableView.swift

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//
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// ListKitReusableView.swift
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// ListKit
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//
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// Created by burt on 2021/09/15.
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//
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import UIKit
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internal class ListKitReusableView: UICollectionReusableView {
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}
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extension ListKitReusableView {
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static var className: String {
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return String(reflecting: Self.self)
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}
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internal override var reuseIdentifier: String? {
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return Self.className
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}
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}

‎Sources/ListKit/DataSource/DataSource.swift

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//
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// DataSource.swift
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// ListKit
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//
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// Created by burt on 2021/09/11.
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//
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import UIKit
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public protocol DataSource {
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var layout: ComposeLayout? { get set }
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var collectionView: UICollectionView? { get set }
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}

‎Sources/ListKit/DataSource/DiffableDataSource.swift

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//
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// DiffableDataSource.swift
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// ListKit
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//
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// Created by burt on 2021/09/16.
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//
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import UIKit
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public class DiffableDataSource: DataSource {
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public var layout: ComposeLayout?
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public weak var collectionView: UICollectionView?
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private var dataSource: UICollectionViewDiffableDataSource<Section, AnyComponent>?
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public init() {
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}
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func applySnapshot(animated: Bool) {
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guard let collectionView = collectionView else { return }
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if self.dataSource == nil {
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self.dataSource = UICollectionViewDiffableDataSource<Section, AnyComponent>(collectionView: collectionView) { [weak self] collectionView, indexPath, section in
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ListKitCell.className, for: indexPath)
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if let wrapper = self?.layout?.sections[indexPath.section].components[indexPath.item], let contentView = wrapper.component.contentView() as? UIView {
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cell.contentView.viewWithTag(Int.max)?.removeFromSuperview()
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contentView.tag = Int.max
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cell.contentView.addSubview(contentView)
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contentView.translatesAutoresizingMaskIntoConstraints = false
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let constraints = [
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cell.contentView.topAnchor.constraint(equalTo: contentView.topAnchor),
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cell.contentView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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cell.contentView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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cell.contentView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor)
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]
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NSLayoutConstraint.activate(constraints)
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wrapper.component.render(in: contentView)
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}
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return cell
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}
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self.dataSource?.supplementaryViewProvider = { (collectionView, kind, indexPath) in
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let view = collectionView.dequeueReusableSupplementaryView(ofKind: ListKitReusableView.className, withReuseIdentifier: ListKitReusableView.className, for: indexPath)
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if let anySupplementaryComponent = SupplementaryComponentManager.shared[kind], let contentView = anySupplementaryComponent.contentView() as? UIView {
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view.viewWithTag(Int.max)?.removeFromSuperview()
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contentView.tag = Int.max
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view.addSubview(contentView)
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contentView.translatesAutoresizingMaskIntoConstraints = false
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let constraints = [
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view.topAnchor.constraint(equalTo: contentView.topAnchor),
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view.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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view.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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view.trailingAnchor.constraint(equalTo: contentView.trailingAnchor)
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]
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NSLayoutConstraint.activate(constraints)
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anySupplementaryComponent.render(in: contentView)
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}
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return view
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}
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collectionView.dataSource = dataSource
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}
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updateSnapshot(animated: animated)
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}
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func updateSnapshot(animated: Bool) {
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guard let layout = layout else { return }
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var snapshot = NSDiffableDataSourceSnapshot<Section, AnyComponent>()
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snapshot.appendSections(layout.sections)
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for section in layout.sections {
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snapshot.appendItems(section.components.map { $0.component }, toSection: section)
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}
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dataSource?.apply(snapshot, animatingDifferences: true)
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}
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}

‎Sources/ListKit/DataSource/PlainDataSource.swift

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//
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// ListKitPlainDataSource.swift
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// ListKit
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//
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// Created by burt on 2021/09/11.
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//
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import UIKit
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public class PlainDataSource: NSObject, DataSource, UICollectionViewDataSource {
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public var layout: ComposeLayout?
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public weak var collectionView: UICollectionView?
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public func numberOfSections(in collectionView: UICollectionView) -> Int {
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guard let layout = layout else { return 0 }
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return layout.sections.count
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}
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public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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guard let layout = layout else { return 0 }
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return layout.sections[section].components.count
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}
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public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ListKitCell.className, for: indexPath)
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if let wrapper = layout?.sections[indexPath.section].components[indexPath.item], let contentView = wrapper.component.contentView() as? UIView {
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cell.contentView.viewWithTag(Int.max)?.removeFromSuperview()
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contentView.tag = Int.max
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cell.contentView.addSubview(contentView)
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contentView.translatesAutoresizingMaskIntoConstraints = false
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let constraints = [
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cell.contentView.topAnchor.constraint(equalTo: contentView.topAnchor),
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cell.contentView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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cell.contentView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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cell.contentView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor)
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]
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NSLayoutConstraint.activate(constraints)
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wrapper.component.render(in: contentView)
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}
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return cell
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}
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public func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
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let view = collectionView.dequeueReusableSupplementaryView(ofKind: ListKitReusableView.className, withReuseIdentifier: ListKitReusableView.className, for: indexPath)
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if let anySupplementaryComponent = SupplementaryComponentManager.shared[kind], let contentView = anySupplementaryComponent.contentView() as? UIView {
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view.viewWithTag(Int.max)?.removeFromSuperview()
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contentView.tag = Int.max
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view.addSubview(contentView)
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contentView.translatesAutoresizingMaskIntoConstraints = false
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let constraints = [
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view.topAnchor.constraint(equalTo: contentView.topAnchor),
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view.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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view.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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view.trailingAnchor.constraint(equalTo: contentView.trailingAnchor)
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]
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NSLayoutConstraint.activate(constraints)
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anySupplementaryComponent.render(in: contentView)
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}
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return view
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}
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}

‎Sources/ListKit/Extensions/NSObjectExtensions.swift

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//
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// NSObjectExtensions.swift
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// ListKit
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//
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// Created by burt on 2021/09/12.
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//
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import Foundation
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extension NSObject {
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private static let componentAssociation = AnyObjectAssociation()
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var anyComponent: AnyObject? {
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get {
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return NSObject.componentAssociation[self]
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}
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set {
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NSObject.componentAssociation[self] = newValue
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}
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}
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}

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