我有2个集合视图部分,当第一次加载此VC时,两个部分(室内和室外)最初将只显示3个项目.
但是在用户按下“更多”按钮后,室内或室外的每个部分都会展开并显示所有可用项目,如下图所示
我试图制作代码,但有时它似乎可以扩展,有时它不会扩展(仍显示3项).
这是主控制器中的代码：
class FacilitiesVC: UIViewController {
@IBOutlet weak var collectionView: UICollectionView!
var facilitiesCategoryData = [[String:Any]]()
var outdoorFacilitiesIsExpanded = false
var indoorFacilitiesIsExpanded = false
override func viewDidLoad() {
super.viewDidLoad()
getIndoorOutdoorFacilitiesData()
}
}
extension FacilitiesVC {
// MARK: - Helper Methods
func getIndoorOutdoorFacilitiesData() {
let facilitiesData = FacilitiesCategoryLibrary.fetchFacilitiesCategory()
var indoorFacilities = [FacilitiesCategory]()
var outdoorFacilities = [FacilitiesCategory]()
// distinguishing between indoor and outdoor data
for facData in facilitiesData {
if facData.type == "Indoor Facility" {
indoorFacilities.append(facData)
} else {
outdoorFacilities.append(facData)
}
}
facilitiesCategoryData = [
["title": "Indoor Facilities", "info": indoorFacilities],
["title": "Outdoor Facilities", "info": outdoorFacilities]
]
}
}
extension FacilitiesVC: UICollectionViewDataSource {
// MARK: - UICollectionViewDataSource
func numberOfSections(in collectionView: UICollectionView) -> Int {
return facilitiesCategoryData.count
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if section == 0 {
if indoorFacilitiesIsExpanded {
let category = facilitiesCategoryData[section]
let infoList = category["info"] as! [FacilitiesCategory]
return infoList.count
} else {
return 3
}
} else {
if outdoorFacilitiesIsExpanded {
let category = facilitiesCategoryData[section]
let infoList = category["info"] as! [FacilitiesCategory]
return infoList.count
} else {
return 3
}
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: StoryBoard.facilitiesCategoryCellIdentifier, for: indexPath) as! FacilitiesCell
let category = facilitiesCategoryData[indexPath.section]
let infoList = category["info"] as! [FacilitiesCategory]
cell.facilitiesCategoryData = infoList[indexPath.item]
return cell
}
// for section header view
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let sectionHeaderView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: StoryBoard.facilitiesSectionHeaderIdentifier, for: indexPath) as! FacilitiesSectionHeader
let category = facilitiesCategoryData[indexPath.section]
sectionHeaderView.categoryData = category
sectionHeaderView.sectionHeaderDelegate = self
return sectionHeaderView
}
}
extension FacilitiesVC: FacilitiesSectionHeaderDelegate {
func didPressButton(_ facilities: String, isExpanded: Bool) {
if facilities == "Indoor Facilities" {
indoorFacilitiesIsExpanded = isExpanded
} else if facilities == "Outdoor Facilities" {
outdoorFacilitiesIsExpanded = isExpanded
}
collectionView.reloadData()
}
}
这是集合视图部分标题中的代码
import UIKit
protocol FacilitiesSectionHeaderDelegate: class {
func didPressButton(_ facilities: String, isExpanded: Bool)
}
class FacilitiesSectionHeader: UICollectionReusableView {
@IBOutlet weak var titleLabel: UILabel!
weak var sectionHeaderDelegate: FacilitiesSectionHeaderDelegate?
var collectionIsExpanded = false
var facilitiesType = ""
var categoryData: [String:Any]! {
didSet {
titleLabel.text = categoryData["title"] as? String
facilitiesType = categoryData["title"] as! String
}
}
@IBAction func moreButtonDidPressed(_ sender: Any) {
collectionIsExpanded = !collectionIsExpanded
sectionHeaderDelegate?.didPressButton(facilitiesType, isExpanded: collectionIsExpanded)
}
}
也许我在这行代码中收集numberOfItemsInSection中的错误
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if section == 0 {
if indoorFacilitiesIsExpanded {
let category = facilitiesCategoryData[section]
let infoList = category["info"] as! [FacilitiesCategory]
return infoList.count
} else {
return 3
}
} else {
if outdoorFacilitiesIsExpanded {
let category = facilitiesCategoryData[section]
let infoList = category["info"] as! [FacilitiesCategory]
return infoList.count
} else {
return 3
}
}
}
我认为该section参数与indexPath.section相同,但似乎有所不同,但我不知道如何从collection numberOfItemsInSection方法访问indexPath.section
怎么解决这个问题？
最佳答案 您必须在viewForSupplementaryElementOfKind中分配当前状态
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let sectionHeaderView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: StoryBoard.facilitiesSectionHeaderIdentifier, for: indexPath) as! FacilitiesSectionHeader
let category = facilitiesCategoryData[indexPath.section]
sectionHeaderView.categoryData = category
sectionHeaderView.sectionHeaderDelegate = self
if(indexPath.section == 0)
{
sectionHeaderView.collectionIsExpanded = indoorFacilitiesIsExpanded
}
else
{
sectionHeaderView.collectionIsExpanded = outdoorFacilitiesIsExpanded
}
return sectionHeaderView
}
在FacilitiesSectionHeader内部,你可以根据它进行翻转
@IBAction func moreButtonDidPressed(_ sender: Any) {
collectionIsExpanded = !collectionIsExpanded
sectionHeaderDelegate?.didPressButton(facilitiesType, isExpanded: collectionIsExpanded)
}
