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‎.gitignore

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# Xcode
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#
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# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
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# Mac OS X Finder and whatnot
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.DS_Store
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## Build generated
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build/
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DerivedData/
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## Various settings
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*.pbxuser
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!default.pbxuser
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*.mode1v3
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!default.mode1v3
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*.mode2v3
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!default.mode2v3
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*.perspectivev3
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!default.perspectivev3
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xcuserdata/
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## Other
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*.moved-aside
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*.xcuserstate
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*.xccheckout
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## Obj-C/Swift specific
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*.hmap
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*.ipa
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*.dSYM.zip
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*.dSYM
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#CocoaPods
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iOS Example/Pods/
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‎SwiftyCollectionViewFlowLayout.xcworkspace/contents.xcworkspacedata

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‎SwiftyCollectionViewFlowLayout.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>IDEDidComputeMac32BitWarning</key>
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<true/>
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</dict>
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</plist>

‎SwiftyCollectionViewFlowLayout/Sources/Model.swift

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//
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// Model.swift
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// SwiftyCollectionViewFlowLayout
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//
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// Created by dfsx6 on 2023/1/31.
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//
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import Foundation
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import UIKit
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internal class BaseSectionModel {
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var headerLayoutAttributes: UICollectionViewLayoutAttributes?
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var footerLayoutAttributes: UICollectionViewLayoutAttributes?
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var itemLayoutAttributes: [UICollectionViewLayoutAttributes] = []
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var sectionInset: UIEdgeInsets = .zero
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var lineSpacing: CGFloat = .zero
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var interitemSpacing: CGFloat = .zero
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var sectionInsetContainHeader: Bool = false
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var sectionInsetContainFooter: Bool = false
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var sectionType: SwiftyCollectionViewSectionType = .normal
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}
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extension BaseSectionModel {
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/// 当前Section中所有Item的总长度
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internal func allItemsLength(scrollDirection: UICollectionView.ScrollDirection) -> CGFloat {
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var length: CGFloat = .zero
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if scrollDirection == .vertical {
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if !itemLayoutAttributes.isEmpty {
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let allItemFrame = itemLayoutAttributes.reduce(itemLayoutAttributes.first!.frame) { partialResult, attr in
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return partialResult.union(attr.frame)
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}
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length += allItemFrame.height
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}
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} else {
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if !itemLayoutAttributes.isEmpty {
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let allItemFrame = itemLayoutAttributes.reduce(itemLayoutAttributes.first!.frame) { partialResult, attr in
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return partialResult.union(attr.frame)
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}
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length += allItemFrame.width
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}
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}
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return length
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}
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/// 当前Section总长度
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internal func totalLength(scrollDirection: UICollectionView.ScrollDirection) -> CGFloat {
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var length: CGFloat = .zero
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if scrollDirection == .vertical {
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//
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length += sectionInset.top
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// header
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if let headerAttr = headerLayoutAttributes {
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length += headerAttr.frame.height
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}
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// items
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length += allItemsLength(scrollDirection: scrollDirection)
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//
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length += sectionInset.bottom
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// footer
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if let footerAttr = footerLayoutAttributes {
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length += footerAttr.frame.height
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}
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} else if scrollDirection == .horizontal {
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//
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length += sectionInset.left
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// header
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if let headerAttr = headerLayoutAttributes {
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length += headerAttr.frame.width
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}
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// items
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length += allItemsLength(scrollDirection: scrollDirection)
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//
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length += sectionInset.right
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// footer
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if let footerAttr = footerLayoutAttributes {
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length += footerAttr.frame.width
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}
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}
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return length
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}
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// 当前Section的Body之前的长度(header + sectionInset.top)
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internal func bodyBeforeLength(scrollDirection: UICollectionView.ScrollDirection) -> CGFloat {
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var length: CGFloat = .zero
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if scrollDirection == .vertical {
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//
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length += sectionInset.top
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// header
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if let headerAttr = headerLayoutAttributes {
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length += headerAttr.frame.height
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}
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} else if scrollDirection == .horizontal {
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//
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length += sectionInset.left
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// header
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if let headerAttr = headerLayoutAttributes {
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length += headerAttr.frame.width
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}
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}
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return length
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}
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/// 当前Section的Footer之前的长度(header + sectionInset.top + body + sectionInset.bottom)
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internal func footerBeforeLength(scrollDirection: UICollectionView.ScrollDirection) -> CGFloat {
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var length: CGFloat = .zero
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if scrollDirection == .vertical {
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//
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length += sectionInset.top
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// header
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if let headerAttr = headerLayoutAttributes {
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length += headerAttr.frame.height
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}
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// items
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length += allItemsLength(scrollDirection: scrollDirection)
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//
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length += sectionInset.bottom
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} else if scrollDirection == .horizontal {
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//
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length += sectionInset.left
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// header
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if let headerAttr = headerLayoutAttributes {
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length += headerAttr.frame.width
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}
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// items
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length += allItemsLength(scrollDirection: scrollDirection)
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//
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length += sectionInset.right
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}
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return length
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}
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}
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internal class NormalSectionModel: BaseSectionModel {
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}
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internal class WaterFlowSectionModel: BaseSectionModel {
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var bodyColumnLengths: [CGFloat] = []
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// /// 当前Section的Body总长度
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// var maxBodyLength: CGFloat {
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// var maxLength: CGFloat = .zero
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// for length in bodyColumnLengths.values {
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// if !length.isLessThanOrEqualTo(maxLength) {
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// maxLength = length
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// }
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// }
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// return maxLength
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// }
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}
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internal class TagListSectionModel: BaseSectionModel {
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}

‎SwiftyCollectionViewFlowLayout/Sources/SwiftyCollectionViewDelegateFlowLayout.swift

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//
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// SwiftyCollectionViewDelegateFlowLayout.swift
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// SwiftyCollectionViewFlowLayout
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//
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// Created by dfsx6 on 2023/1/9.
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//
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import Foundation
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import UIKit
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public protocol SwiftyCollectionViewDelegateFlowLayout: UICollectionViewDelegateFlowLayout {
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/// SectionType
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func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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sectionType section: Int) -> SwiftyCollectionViewSectionType
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func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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sectionInsetContainHeader section: Int) -> Bool
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func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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sectionInsetContainFooter section: Int) -> Bool
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/// The collection view calls this method when the collectionView contentSize change.
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func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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contentSizeDidChange size: CGSize)
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}
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extension SwiftyCollectionViewDelegateFlowLayout {
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public func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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sectionInsetContainHeader section: Int) -> Bool {
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return false
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}
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public func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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sectionInsetContainFooter section: Int) -> Bool {
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return false
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}
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public func collectionView(_ collectionView: UICollectionView,
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layout collectionViewLayout: SwiftyCollectionViewFlowLayout,
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contentSizeDidChange size: CGSize) { }
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}

‎SwiftyCollectionViewFlowLayout/Sources/SwiftyCollectionViewFlowLayout+Normal.swift

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//
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// SwiftyCollectionViewFlowLayout+Normal.swift
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// SwiftyCollectionViewFlowLayout
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//
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// Created by dfsx6 on 2023/2/1.
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//
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import Foundation
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import UIKit
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extension SwiftyCollectionViewFlowLayout {
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internal func _layoutNormalAttributesForItem(at indexPath: IndexPath) {
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guard let _ = collectionView else { return }
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guard let sectionModel = sectionModels[indexPath.section] else { return }
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guard let cellAttr = super.layoutAttributesForItem(at: indexPath)?.copy() as? UICollectionViewLayoutAttributes else { return }
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// Use system item frame
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// Update Section Model
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sectionModel.itemLayoutAttributes.append(cellAttr)
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}
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}

‎SwiftyCollectionViewFlowLayout/Sources/SwiftyCollectionViewFlowLayout+Supplementary.swift

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//
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// SwiftyCollectionViewFlowLayout+Supplementary.swift
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// SwiftyCollectionViewFlowLayout
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//
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// Created by dfsx6 on 2023/2/1.
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//
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import Foundation
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import UIKit
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extension SwiftyCollectionViewFlowLayout {
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internal func _layoutAttributesForSupplementaryView(ofKind elementKind: String, at indexPath: IndexPath) {
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guard let collectionView = collectionView else { return }
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guard let sectionModel = sectionModels[indexPath.section] else { return }
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let supplementaryViewAttr = UICollectionViewLayoutAttributes(forSupplementaryViewOfKind: elementKind, with: indexPath)
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if elementKind == UICollectionView.elementKindSectionHeader {
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// Header
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let headerSize = mDelegate?.collectionView?(collectionView,
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layout: self,
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referenceSizeForHeaderInSection: indexPath.section) ?? .zero
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var header_x: CGFloat = .zero
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var header_y: CGFloat = .zero
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var header_width: CGFloat = .zero
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var header_height: CGFloat = .zero
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if scrollDirection == .vertical {
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header_x = .zero
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header_y = .zero
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header_width = collectionView.frame.width
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header_height = headerSize.height
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} else if scrollDirection == .horizontal {
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header_x = .zero
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header_y = .zero
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header_width = headerSize.width
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header_height = collectionView.frame.height
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}
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supplementaryViewAttr.frame = CGRect(x: header_x,
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y: header_y,
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width: header_width,
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height: header_height)
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sectionModel.headerLayoutAttributes = supplementaryViewAttr
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} else if elementKind == UICollectionView.elementKindSectionFooter {
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// Footer
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let footerSize = mDelegate?.collectionView?(collectionView,
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layout: self,
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referenceSizeForFooterInSection: indexPath.section) ?? .zero
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var footer_x: CGFloat = .zero
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var footer_y: CGFloat = .zero
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var footer_width: CGFloat = .zero
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var footer_height: CGFloat = .zero
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if scrollDirection == .vertical {
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footer_x = .zero
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footer_y = .zero
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footer_width = collectionView.frame.width
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footer_height = footerSize.height
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} else if scrollDirection == .horizontal {
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footer_x = .zero
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footer_y = .zero
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footer_width = footerSize.width
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footer_height = collectionView.frame.height
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}
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supplementaryViewAttr.frame = CGRect(x: footer_x,
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y: footer_y,
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width: footer_width,
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height: footer_height)
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sectionModel.footerLayoutAttributes = supplementaryViewAttr
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}
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}
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}

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