75d24c15
yangbin
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//
// JTAppleCalendarLayout.swift
//
// Copyright (c) 2016-2017 JTAppleCalendar (https://github.com/patchthecode/JTAppleCalendar)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
/// Methods in this class are meant to be overridden and will be called by its collection view to gather layout information.
class JTAppleCalendarLayout: UICollectionViewLayout, JTAppleCalendarLayoutProtocol {
var allowsDateCellStretching = true
var firstContentOffsetWasSet = false
var lastSetCollectionViewSize: CGRect = .zero
var cellSize: CGSize = CGSize.zero
var shouldUseUserItemSizeInsteadOfDefault: Bool { return delegate.cellSize == 0 ? false: true }
var scrollDirection: UICollectionView.ScrollDirection = .horizontal
var maxMissCount: Int = 0
var cellCache: [Int: [(Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)]] = [:]
var headerCache: [Int: (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)] = [:]
var decorationCache: [IndexPath:UICollectionViewLayoutAttributes] = [:]
var sectionSize: [CGFloat] = []
var lastWrittenCellAttribute: (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)!
var stride: CGFloat = 0
var minimumInteritemSpacing: CGFloat = 0
var minimumLineSpacing: CGFloat = 0
var sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
var headerSizes: [AnyHashable:CGFloat] = [:]
var focusIndexPath: IndexPath?
var isCalendarLayoutLoaded: Bool { return !cellCache.isEmpty }
var layoutIsReadyToBePrepared: Bool { return !(!cellCache.isEmpty || delegate.calendarDataSource == nil) }
var monthMap: [Int: Int] = [:]
var numberOfRows: Int = 0
var strictBoundaryRulesShouldApply: Bool = false
var thereAreHeaders: Bool { return !headerSizes.isEmpty }
var thereAreDecorationViews = false
weak var delegate: JTAppleCalendarDelegateProtocol!
var currentHeader: (section: Int, size: CGSize)? // Tracks the current header size
var currentCell: (section: Int, width: CGFloat, height: CGFloat)? // Tracks the current cell size
var contentHeight: CGFloat = 0 // Content height of calendarView
var contentWidth: CGFloat = 0 // Content wifth of calendarView
var xCellOffset: CGFloat = 0
var yCellOffset: CGFloat = 0
var endSeparator: CGFloat = 0
var delayedExecutionClosure: [(() -> Void)] = []
func executeDelayedTasks() {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
let tasksToExecute = self.delayedExecutionClosure
self.delayedExecutionClosure.removeAll()
for aTaskToExecute in tasksToExecute {
aTaskToExecute()
}
}
}
var daysInSection: [Int: Int] = [:] // temporary caching
var monthInfo: [Month] = []
var reloadWasTriggered = false
var isDirty: Bool {
return updatedLayoutCellSize != cellSize
}
var updatedLayoutCellSize: CGSize {
guard let cachedConfiguration = delegate._cachedConfiguration else { return .zero }
// Default Item height and width
var height: CGFloat = collectionView!.bounds.size.height / CGFloat(cachedConfiguration.numberOfRows)
var width: CGFloat = collectionView!.bounds.size.width / CGFloat(maxNumberOfDaysInWeek)
if shouldUseUserItemSizeInsteadOfDefault { // If delegate item size was set
if scrollDirection == .horizontal {
width = delegate.cellSize
} else {
height = delegate.cellSize
}
}
return CGSize(width: width, height: height)
}
open override func register(_ nib: UINib?, forDecorationViewOfKind elementKind: String) {
super.register(nib, forDecorationViewOfKind: elementKind)
thereAreDecorationViews = true
}
open override func register(_ viewClass: AnyClass?, forDecorationViewOfKind elementKind: String) {
super.register(viewClass, forDecorationViewOfKind: elementKind)
thereAreDecorationViews = true
}
init(withDelegate delegate: JTAppleCalendarDelegateProtocol) {
super.init()
self.delegate = delegate
}
/// Tells the layout object to update the current layout.
open override func prepare() {
// set the last content size before the if statement which can possible return if layout is not yet ready to be prepared. Avoids inf loop
// with layout subviews
lastSetCollectionViewSize = collectionView!.frame
if !layoutIsReadyToBePrepared {
// Layoout may not be ready, but user might have reloaded with an anchor date
let requestedOffset = delegate.requestedContentOffset
if requestedOffset != .zero { collectionView!.setContentOffset(requestedOffset, animated: false) }
// execute any other delayed tasks
executeDelayedTasks()
return
}
setupDataFromDelegate()
if scrollDirection == .vertical {
configureVerticalLayout()
} else {
configureHorizontalLayout()
}
// Get rid of header data if dev didnt register headers.
// They were used for calculation but are not needed to be displayed
if !thereAreHeaders {
headerCache.removeAll()
}
// Set the first content offset only once. This will prevent scrolling animation on viewDidload.
if !firstContentOffsetWasSet {
firstContentOffsetWasSet = true
let firstContentOffset = delegate.requestedContentOffset
collectionView!.setContentOffset(firstContentOffset, animated: false)
}
daysInSection.removeAll() // Clear chache
reloadWasTriggered = false
executeDelayedTasks()
}
func setupDataFromDelegate() {
// get information from the delegate
headerSizes = delegate.sizesForMonthSection() // update first. Other variables below depend on it
strictBoundaryRulesShouldApply = thereAreHeaders || delegate._cachedConfiguration.hasStrictBoundaries
numberOfRows = delegate._cachedConfiguration.numberOfRows
monthMap = delegate.monthMap
allowsDateCellStretching = delegate.allowsDateCellStretching
monthInfo = delegate.monthInfo
scrollDirection = delegate.scrollDirection
maxMissCount = scrollDirection == .horizontal ? maxNumberOfRowsPerMonth : maxNumberOfDaysInWeek
minimumInteritemSpacing = delegate.minimumInteritemSpacing
minimumLineSpacing = delegate.minimumLineSpacing
sectionInset = delegate.sectionInset
cellSize = updatedLayoutCellSize
}
func indexPath(direction: SegmentDestination, of section:Int, item: Int) -> IndexPath? {
var retval: IndexPath?
switch direction {
case .next:
if let data = cellCache[section], !data.isEmpty, 0..<data.count ~= item + 1 {
retval = IndexPath(item: item + 1, section: section)
} else if let data = cellCache[section + 1], !data.isEmpty {
retval = IndexPath(item: 0, section: section + 1)
}
case .previous:
if let data = cellCache[section], !data.isEmpty, 0..<data.count ~= item - 1 {
retval = IndexPath(item: item - 1, section: section)
} else if let data = cellCache[section - 1], !data.isEmpty {
retval = IndexPath(item: data.count - 1, section: section - 1)
}
default:
break
}
return retval
}
func configureHorizontalLayout() {
var section = 0
var totalDayCounter = 0
var headerGuide = 0
let fullSection = numberOfRows * maxNumberOfDaysInWeek
var extra = 0
xCellOffset = sectionInset.left
endSeparator = sectionInset.left + sectionInset.right
for aMonth in monthInfo {
for numberOfDaysInCurrentSection in aMonth.sections {
// Generate and cache the headers
if let aHeaderAttr = determineToApplySupplementaryAttribs(0, section: section) {
headerCache[section] = aHeaderAttr
if strictBoundaryRulesShouldApply {
contentWidth += aHeaderAttr.4
yCellOffset = aHeaderAttr.5
}
}
// Generate and cache the cells
for item in 0..<numberOfDaysInCurrentSection {
guard let attribute = determineToApplyAttribs(item, section: section) else { continue }
if cellCache[section] == nil {
cellCache[section] = []
}
cellCache[section]!.append(attribute)
lastWrittenCellAttribute = attribute
xCellOffset += attribute.4
if strictBoundaryRulesShouldApply {
headerGuide += 1
if numberOfDaysInCurrentSection - 1 == item || headerGuide % maxNumberOfDaysInWeek == 0 {
// We are at the last item in the section
// && if we have headers
headerGuide = 0
xCellOffset = sectionInset.left
yCellOffset += attribute.5
}
} else {
totalDayCounter += 1
extra += 1
if totalDayCounter % fullSection == 0 { // If you have a full section
xCellOffset = sectionInset.left
yCellOffset = 0
contentWidth += attribute.4 * 7
stride = contentWidth
sectionSize.append(contentWidth)
} else {
if totalDayCounter >= delegate.totalDays {
contentWidth += attribute.4 * 7
sectionSize.append(contentWidth)
}
if totalDayCounter % maxNumberOfDaysInWeek == 0 {
xCellOffset = sectionInset.left
yCellOffset += attribute.5
}
}
}
}
// Save the content size for each section
contentWidth += endSeparator
if strictBoundaryRulesShouldApply {
sectionSize.append(contentWidth)
stride = sectionSize[section]
}
section += 1
}
}
contentHeight = self.collectionView!.bounds.size.height
}
func configureVerticalLayout() {
var section = 0
var totalDayCounter = 0
var headerGuide = 0
xCellOffset = sectionInset.left
yCellOffset = sectionInset.top
endSeparator = sectionInset.top + sectionInset.bottom
for aMonth in monthInfo {
for numberOfDaysInCurrentSection in aMonth.sections {
// Generate and cache the headers
if strictBoundaryRulesShouldApply {
if let aHeaderAttr = determineToApplySupplementaryAttribs(0, section: section) {
headerCache[section] = aHeaderAttr
yCellOffset += aHeaderAttr.5
contentHeight += aHeaderAttr.5
}
}
// Generate and cache the cells
for item in 0..<numberOfDaysInCurrentSection {
guard let attribute = determineToApplyAttribs(item, section: section) else { continue }
if cellCache[section] == nil {
cellCache[section] = []
}
cellCache[section]!.append(attribute)
lastWrittenCellAttribute = attribute
xCellOffset += attribute.4
if strictBoundaryRulesShouldApply {
headerGuide += 1
if headerGuide % maxNumberOfDaysInWeek == 0 || numberOfDaysInCurrentSection - 1 == item {
// We are at the last item in the
// section && if we have headers
headerGuide = 0
xCellOffset = sectionInset.left
yCellOffset += attribute.5
contentHeight += attribute.5
}
} else {
totalDayCounter += 1
if totalDayCounter % maxNumberOfDaysInWeek == 0 {
xCellOffset = sectionInset.left
yCellOffset += attribute.5
contentHeight += attribute.5
} else if totalDayCounter == delegate.totalDays {
contentHeight += attribute.5
}
}
}
// Save the content size for each section
contentHeight += endSeparator
yCellOffset += endSeparator
sectionSize.append(contentHeight)
section += 1
}
}
contentWidth = self.collectionView!.bounds.size.width
}
/// Returns the width and height of the collection view’s contents.
/// The width and height of the collection view’s contents.
open override var collectionViewContentSize: CGSize {
return CGSize(width: contentWidth, height: contentHeight)
}
override func invalidateLayout() {
super.invalidateLayout()
if isDirty && reloadWasTriggered {
clearCache()
}
}
override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
return
abs(lastSetCollectionViewSize.height - newBounds.height) > errorDelta ||
abs(lastSetCollectionViewSize.width - newBounds.width) > errorDelta
}
/// Returns the layout attributes for all of the cells
/// and views in the specified rectangle.
override open func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
let startSectionIndex = startIndexFrom(rectOrigin: rect.origin)
// keep looping until there were no interception rects
var attributes: [UICollectionViewLayoutAttributes] = []
var beganIntercepting = false
var missCount = 0
outterLoop: for sectionIndex in startSectionIndex..<cellCache.count {
if let validSection = cellCache[sectionIndex], !validSection.isEmpty {
if thereAreDecorationViews {
let attrib = layoutAttributesForDecorationView(ofKind: decorationViewID, at: IndexPath(item: 0, section: sectionIndex))!
attributes.append(attrib)
}
// Add header view attributes
if thereAreHeaders {
let data = headerCache[sectionIndex]!
if CGRect(x: data.2, y: data.3, width: data.4, height: data.5).intersects(rect) {
let attrib = layoutAttributesForSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader, at: IndexPath(item: data.0, section: data.1))
attributes.append(attrib!)
}
}
for val in validSection {
if CGRect(x: val.2, y: val.3, width: val.4, height: val.5).intersects(rect) {
missCount = 0
beganIntercepting = true
let attrib = layoutAttributesForItem(at: IndexPath(item: val.0, section: val.1))
attributes.append(attrib!)
} else {
missCount += 1
// If there are at least 8 misses in a row
// since intercepting began, then this
// section has no more interceptions.
// So break
if missCount > maxMissCount && beganIntercepting { break outterLoop }
}
}
}
}
return attributes
}
/// Returns the layout attributes for the item at the specified index
/// path. A layout attributes object containing the information to apply
/// to the item’s cell.
override open func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
// If this index is already cached, then return it else,
// apply a new layout attribut to it
if let alreadyCachedCellAttrib = cellAttributeFor(indexPath.item, section: indexPath.section) {
return alreadyCachedCellAttrib
}
return nil//deterimeToApplyAttribs(indexPath.item, section: indexPath.section)
}
func supplementaryAttributeFor(item: Int, section: Int, elementKind: String) -> UICollectionViewLayoutAttributes? {
var retval: UICollectionViewLayoutAttributes?
if let cachedData = headerCache[section] {
let attributes = UICollectionViewLayoutAttributes(forSupplementaryViewOfKind: elementKind, with: IndexPath(item: item, section: section))
attributes.frame = CGRect(x: cachedData.2, y: cachedData.3, width: cachedData.4, height: cachedData.5)
retval = attributes
}
return retval
}
func cachedValue(for item: Int, section: Int) -> (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)? {
if
let alreadyCachedCellAttrib = cellCache[section],
item < alreadyCachedCellAttrib.count,
item >= 0 {
return alreadyCachedCellAttrib[item]
}
return nil
}
func cellAttributeFor(_ item: Int, section: Int) -> UICollectionViewLayoutAttributes? {
guard let cachedValue = cachedValue(for: item, section: section) else { return nil }
let attrib = UICollectionViewLayoutAttributes(forCellWith: IndexPath(item: item, section: section))
attrib.frame = CGRect(x: cachedValue.2, y: cachedValue.3, width: cachedValue.4, height: cachedValue.5)
if minimumInteritemSpacing > -1, minimumLineSpacing > -1 {
var frame = attrib.frame.insetBy(dx: minimumInteritemSpacing, dy: minimumLineSpacing)
if frame == .null {
frame = attrib.frame.insetBy(dx: 0, dy: 0)
}
attrib.frame = frame
}
return attrib
}
func determineToApplyAttribs(_ item: Int, section: Int) -> (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)? {
let monthIndex = monthMap[section]!
let numberOfDays = numberOfDaysInSection(monthIndex)
// return nil on invalid range
if !(0...monthMap.count ~= section) || !(0...numberOfDays ~= item) { return nil }
let size = sizeForitemAtIndexPath(item, section: section)
let y = scrollDirection == .horizontal ? yCellOffset + sectionInset.top : yCellOffset
return (item, section, xCellOffset + stride, y, size.width, size.height)
}
func determineToApplySupplementaryAttribs(_ item: Int, section: Int) -> (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)? {
var retval: (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)?
let headerHeight = cachedHeaderHeightForSection(section)
switch scrollDirection {
case .horizontal:
let modifiedSize = sizeForitemAtIndexPath(item, section: section)
let width = (modifiedSize.width * 7)
retval = (item, section, contentWidth + sectionInset.left, sectionInset.top, width , headerHeight)
case .vertical:
// Use the calculaed header size and force the width
// of the header to take up 7 columns
// We cache the header here so we dont call the
// delegate so much
let modifiedSize = (width: collectionView!.frame.width, height: headerHeight)
retval = (item, section, sectionInset.left, yCellOffset , modifiedSize.width - (sectionInset.left + sectionInset.right), modifiedSize.height)
}
if retval?.4 == 0, retval?.5 == 0 {
return nil
}
return retval
}
open override func layoutAttributesForDecorationView(ofKind elementKind: String, at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
if let alreadyCachedVal = decorationCache[indexPath] { return alreadyCachedVal }
let retval = UICollectionViewLayoutAttributes(forDecorationViewOfKind: decorationViewID, with: indexPath)
decorationCache[indexPath] = retval
retval.frame = delegate.sizeOfDecorationView(indexPath: indexPath)
retval.zIndex = -1
return retval
}
/// Returns the layout attributes for the specified supplementary view.
open override func layoutAttributesForSupplementaryView(ofKind elementKind: String, at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
if let alreadyCachedHeaderAttrib = supplementaryAttributeFor(item: indexPath.item, section: indexPath.section, elementKind: elementKind) {
return alreadyCachedHeaderAttrib
}
return nil
}
func numberOfDaysInSection(_ index: Int) -> Int {
if let days = daysInSection[index] {
return days
}
let days = monthInfo[index].numberOfDaysInMonthGrid
daysInSection[index] = days
return days
}
func cachedHeaderHeightForSection(_ section: Int) -> CGFloat {
var retval: CGFloat = 0
// We look for most specific to less specific
// Section = specific dates
// Months = generic months
// Default = final resort
if let height = headerSizes[section] {
retval = height
} else {
let monthIndex = monthMap[section]!
let monthName = monthInfo[monthIndex].name
if let height = headerSizes[monthName] {
retval = height
} else if let height = headerSizes["default"] {
retval = height
}
}
return retval
}
func sizeForitemAtIndexPath(_ item: Int, section: Int) -> (width: CGFloat, height: CGFloat) {
if let cachedCell = currentCell,
cachedCell.section == section {
if !strictBoundaryRulesShouldApply, scrollDirection == .horizontal,
!cellCache.isEmpty {
if let x = cellCache[0]?[0] {
return (x.4, x.5)
} else {
return (0, 0)
}
} else {
return (cachedCell.width, cachedCell.height)
}
}
let width = cellSize.width - ((sectionInset.left / 7) + (sectionInset.right / 7))
var size: (width: CGFloat, height: CGFloat) = (width, cellSize.height)
if shouldUseUserItemSizeInsteadOfDefault {
if scrollDirection == .vertical {
size.height = cellSize.height
} else {
size.width = cellSize.width
let headerHeight = strictBoundaryRulesShouldApply ? cachedHeaderHeightForSection(section) : 0
let currentMonth = monthInfo[monthMap[section]!]
let recalculatedNumOfRows = allowsDateCellStretching ? CGFloat(currentMonth.maxNumberOfRowsForFull(developerSetRows: numberOfRows)) : CGFloat(maxNumberOfRowsPerMonth)
size.height = (collectionView!.frame.height - headerHeight - sectionInset.top - sectionInset.bottom) / recalculatedNumOfRows
currentCell = (section: section, width: size.width, height: size.height)
}
} else {
// Get header size if it already cached
let headerHeight = strictBoundaryRulesShouldApply ? cachedHeaderHeightForSection(section) : 0
var height: CGFloat = 0
let currentMonth = monthInfo[monthMap[section]!]
let numberOfRowsForSection: Int
if allowsDateCellStretching {
numberOfRowsForSection
= strictBoundaryRulesShouldApply ? currentMonth.maxNumberOfRowsForFull(developerSetRows: numberOfRows) : numberOfRows
} else {
numberOfRowsForSection = maxNumberOfRowsPerMonth
}
height = (collectionView!.frame.height - headerHeight - sectionInset.top - sectionInset.bottom) / CGFloat(numberOfRowsForSection)
size.height = height > 0 ? height : 0
currentCell = (section: section, width: size.width, height: size.height)
}
return size
}
func numberOfRowsForMonth(_ index: Int) -> Int {
let monthIndex = monthMap[index]!
return monthInfo[monthIndex].rows
}
func startIndexFrom(rectOrigin offset: CGPoint) -> Int {
let key = scrollDirection == .horizontal ? offset.x : offset.y
return startIndexBinarySearch(sectionSize, offset: key)
}
func sizeOfContentForSection(_ section: Int) -> CGFloat {
switch scrollDirection {
case .horizontal:
return cellCache[section]![0].4 * CGFloat(maxNumberOfDaysInWeek) + sectionInset.left + sectionInset.right
case .vertical:
let headerSizeOfSection = !headerCache.isEmpty ? headerCache[section]!.5 : 0
return cellCache[section]![0].5 * CGFloat(numberOfRowsForMonth(section)) + headerSizeOfSection
}
}
func sectionFromOffset(_ theOffSet: CGFloat) -> Int {
var val: Int = 0
for (index, sectionSizeValue) in sectionSize.enumerated() {
if abs(theOffSet - sectionSizeValue) < errorDelta {
continue
}
if theOffSet < sectionSizeValue {
val = index
break
}
}
return val
}
func startIndexBinarySearch<T: Comparable>(_ val: [T], offset: T) -> Int {
if val.count < 3 {
return 0
} // If the range is less than 2 just break here.
var midIndex: Int = 0
var startIndex = 0
var endIndex = val.count - 1
while startIndex < endIndex {
midIndex = startIndex + (endIndex - startIndex) / 2
if midIndex + 1 >= val.count || offset >= val[midIndex] &&
offset < val[midIndex + 1] || val[midIndex] == offset {
break
} else if val[midIndex] < offset {
startIndex = midIndex + 1
} else {
endIndex = midIndex
}
}
return midIndex
}
/// Returns an object initialized from data in a given unarchiver.
/// self, initialized using the data in decoder.
required public init?(coder aDecoder: NSCoder) {
delegate = (aDecoder.value(forKey: "delegate") as! JTAppleCalendarDelegateProtocol)
cellCache = aDecoder.value(forKey: "delegate") as! [Int : [(Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)]]
headerCache = aDecoder.value(forKey: "delegate") as! [Int : (Int, Int, CGFloat, CGFloat, CGFloat, CGFloat)]
headerSizes = aDecoder.value(forKey: "delegate") as! [AnyHashable:CGFloat]
super.init(coder: aDecoder)
}
// This function ignores decoration views //JT101 for setting proposal
func minimumVisibleIndexPaths() -> (cellIndex: IndexPath?, headerIndex: IndexPath?) {
let visibleItems: [UICollectionViewLayoutAttributes] = scrollDirection == .horizontal ? elementsAtRect(excludeHeaders: true) : elementsAtRect()
var cells: [IndexPath] = []
var headers: [IndexPath] = []
for item in visibleItems {
switch item.representedElementCategory {
case .cell:
cells.append(item.indexPath)
case .supplementaryView:
headers.append(item.indexPath)
case .decorationView:
break
}
}
return (cells.min(), headers.min())
}
func elementsAtRect(excludeHeaders: Bool? = false, from rect: CGRect? = nil) -> [UICollectionViewLayoutAttributes] {
let aRect = rect ?? CGRect(x: collectionView!.contentOffset.x + 1, y: collectionView!.contentOffset.y + 1, width: collectionView!.frame.width - 2, height: collectionView!.frame.height - 2)
guard let attributes = layoutAttributesForElements(in: aRect), !attributes.isEmpty else {
return []
}
if excludeHeaders == true {
return attributes.filter { $0.representedElementKind != UICollectionView.elementKindSectionHeader }
}
return attributes
}
func clearCache() {
headerCache.removeAll()
cellCache.removeAll()
sectionSize.removeAll()
decorationCache.removeAll()
currentHeader = nil
currentCell = nil
lastWrittenCellAttribute = nil
xCellOffset = 0
yCellOffset = 0
contentHeight = 0
contentWidth = 0
stride = 0
firstContentOffsetWasSet = false
}
}
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