Swift 尝试删除多个（以编程方式添加的）单元格后CollectionView崩溃
我有一个UICollectionView，它有一个非常简单的数据源。它只是一个以编程方式更新的字符串数组。使用此UICollectionView，我可以点击选择多个单元格，然后可以使用删除按钮删除所有选定的单元格。非常简单，只是我有时会遇到一个致命错误：索引超出范围 通过点击另一个名为“所有嗜好”的集合视图中的单元格，可以通过编程方式添加单元格。在“所有嗜好”CV中点击和选择的任何单元格都可以添加到“我的嗜好”中。我通过将点击单元格的值附加到控制“我的嗜好”CV的数组中来完成此操作 问题Swift 尝试删除多个（以编程方式添加的）单元格后CollectionView崩溃,swift,crash,uicollectionview,uicollectionviewcell,Swift,Crash,Uicollectionview,Uicollectionviewcell,我有一个UICollectionView，它有一个非常简单的数据源。它只是一个以编程方式更新的字符串数组。使用此UICollectionView，我可以点击选择多个单元格，然后可以使用删除按钮删除所有选定的单元格。非常简单，只是我有时会遇到一个致命错误：索引超出范围 通过点击另一个名为“所有嗜好”的集合视图中的单元格，可以通过编程方式添加单元格。在“所有嗜好”CV中点击和选择的任何单元格都可以添加到“我的嗜好”中。我通过将点击单元格的值附加到控制“我的嗜好”CV的数组中来完成此操作 问题 根据我
let allHobbiesArray = ["Skiing", "Jogging", "Bicycling", "Basketball", "Cricket", "Being a Couch Potato", "Skiing", "Jogging", "Bicycling", "Basketball", "Cricket", "Being a Couch Potato", "Skiing", "Jogging", "Bicycling", "Basketball", "Cricket", "Being a Couch Potato", "Skiing", "Jogging", "Bicycling", "Basketball", "Cricket", "Being a Couch Potato"]
var myHobbiesArray = [String]()
var allSelected = [IndexPath]()
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == allHobbiesCV {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ALL", for: indexPath) as! AllHobbiesCell
cell.allHobbiesLabel.text = allHobbiesArray[indexPath.row]
return cell
}
else {
let cell = myHobbiesCV.dequeueReusableCell(withReuseIdentifier: "MY", for: indexPath) as! MyHobbiesCell
cell.myHobbiesLabel.text = myHobbiesArray[indexPath.row]
return cell
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == allHobbiesCV {
return allHobbiesArray.count
}
else {
return myHobbiesArray.count
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if collectionView == allHobbiesCV {
let cell = allHobbiesCV.cellForItem(at: indexPath) as! AllHobbiesCell
myHobbiesArray.append(allHobbiesArray[indexPath.row])
myHobbiesCV.reloadData()
for i in 0..<allSelected.count {
self.myHobbiesCV.selectItem(at: allSelected[i], animated: false, scrollPosition: [])
}
}
else {
let cell = myHobbiesCV.cellForItem(at: indexPath) as! MyHobbiesCell
cell.backgroundColor = UIColor.red // Red background to show that it's selected
// Store all of the selected cells in allSelected
allSelected = self.myHobbiesCV.indexPathsForSelectedItems!
}
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
if collectionView == allHobbiesCV {
let cell = allHobbiesCV.cellForItem(at: indexPath) as! AllHobbiesCell
cell.backgroundColor = UIColor.yellow
}
else {
let cell = myHobbiesCV.cellForItem(at: indexPath) as! MyHobbiesCell
cell.backgroundColor = UIColor.yellow
// update allSelected after deselect
allSelected = self.myHobbiesCV.indexPathsForSelectedItems!
}
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == allHobbiesCV {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ALL", for: indexPath) as! AllHobbiesCell
cell.allHobbiesLabel.text = allHobbiesArray[indexPath.row]
return cell
}
else {
let cell = myHobbiesCV.dequeueReusableCell(withReuseIdentifier: "MY", for: indexPath) as! MyHobbiesCell
cell.myHobbiesLabel.text = myHobbiesArray[indexPath.row]
return cell
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == allHobbiesCV {
return allHobbiesArray.count
}
else {
return myHobbiesArray.count
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if collectionView == allHobbiesCV {
let cell = allHobbiesCV.cellForItem(at: indexPath) as! AllHobbiesCell
myHobbiesArray.append(allHobbiesArray[indexPath.row])
myHobbiesCV.reloadData()
for i in 0..<allSelected.count {
self.myHobbiesCV.selectItem(at: allSelected[i], animated: false, scrollPosition: [])
}
}
else {
let cell = myHobbiesCV.cellForItem(at: indexPath) as! MyHobbiesCell
cell.backgroundColor = UIColor.red // Red background to show that it's selected
// Store all of the selected cells in allSelected
allSelected = self.myHobbiesCV.indexPathsForSelectedItems!
}
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
if collectionView == allHobbiesCV {
let cell = allHobbiesCV.cellForItem(at: indexPath) as! AllHobbiesCell
cell.backgroundColor = UIColor.yellow
}
else {
let cell = myHobbiesCV.cellForItem(at: indexPath) as! MyHobbiesCell
cell.backgroundColor = UIColor.yellow
// update allSelected after deselect
allSelected = self.myHobbiesCV.indexPathsForSelectedItems!
}
}
allSelectedmyHobbiesArray@IBAction func deleteButtonPressed(_ sender: UIButton) {
let indices = allSelected.map{ $0.item }
myHobbiesArray = myHobbiesArray.enumerated().flatMap { indices.contains($0.0) ? nil : $0.1 }
self.myHobbiesCV.deleteItems(at: allSelected)
}
我想你有几个问题。每次删除时，您都在调用
reloadData（）performbatchUpdateperformBatchUpdatesdeleteItems（at:）performbatchUpdatemyHobbiesArraydeleteItems（at:）allSelectedPerformBatchUpdateself.myHobbiesCV.deleteItems（at:allSelected）[2,3][0,1,2,3][0，1，2]