我有一个ViewController，上面有多个UICollectionViews。最初，我从两个（myFavoritesCollectionView和allDealsCollectionView）开始，该应用程序充分运行。但是，当我添加其他应用程序时，该应用程序开始崩溃。
我设置了一个异常断点并收到错误消息：
2019-04-28 21：00：44.802033-0500 DiscountDays_ [67279：13374922] ***-[UICollectionView _dequeueReusableViewOfKind：withIdentifier：forIndexPath：viewCategory：]，/ BuildRoot / Library / Caches / com.apple中的声明失败.xbs / Sources / UIKitCore_Sim / UIKit-3698.103.12 / UICollectionView.m：5417
它突出显示了这一行：
let cell2 = collectionView.dequeueReusableCell(withReuseIdentifier: "hello", for: indexPath) as? FastFoodCollectionViewCell
下面是我的UIViewController上的扩展名：
extension ViewController:UICollectionViewDelegate,UICollectionViewDataSource{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == self.myFavoritesCollectionView{
print(myEmptyArray.count)
return self.myEmptyArray.count
}
else if collectionView == self.fastFoodCollectionView{
return self.fastFoodArray.count
}
else if collectionView == self.DessertsCollectionView{
return self.dessertsArray.count
}
else if collectionView == self.sitDownRestrauntsCollectionView{
return self.sitDownArray.count
}
else if collectionView == self.otherThanFoodCollectionView{
return self.otherArray.count
}
else {
print(allDiscounts.list.count)
return allDiscounts.list.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == myFavoritesCollectionView{
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: "theLikes", for: indexPath) as? myLikesCollectionViewCell
cell1?.companyLikedImage.image = UIImage(named: allDiscounts.list[myEmptyArray[indexPath.row]].imageName)
cell1?.companyLikedName.text = allDiscounts.list[myEmptyArray[indexPath.row]].businessName
cell1?.layer.cornerRadius = 11
print("collectionviewlikes")
return cell1!
}
else if collectionView == fastFoodCollectionView{
let cell2 = collectionView.dequeueReusableCell(withReuseIdentifier: "hello", for: indexPath) as? FastFoodCollectionViewCell
cell2?.fastCompanyLikedImage.image = UIImage(named: allDiscounts.list[fastFoodArray[indexPath.row]].imageName)
cell2?.fastCompanyLikedName.text = allDiscounts.list[fastFoodArray[indexPath.row]].businessName
cell2?.layer.cornerRadius = 11
print("collectionviewfast")
return cell2!
}
else if collectionView.isEqual(DessertsCollectionView) {
let cell3 = collectionView.dequeueReusableCell(withReuseIdentifier: "theDesserts", for: indexPath) as? DessertsCollectionViewCell
cell3?.dessertsCompanyLikedImage.image = UIImage(named: allDiscounts.list[dessertsArray[indexPath.row]].imageName)
cell3?.dessertsCompanyLikedName.text = allDiscounts.list[dessertsArray[indexPath.row]].businessName
cell3?.layer.cornerRadius = 11
print("collectionviewdesserts")
return cell3!
}
else if collectionView == sitDownRestrauntsCollectionView {
let cell4 = collectionView.dequeueReusableCell(withReuseIdentifier: "theSits", for: indexPath) as? sitDownCollectionViewCell
cell4?.sitCompanyLikedImage.image = UIImage(named: allDiscounts.list[sitDownArray[indexPath.row]].imageName)
cell4?.sitCompanyLikedName.text = allDiscounts.list[sitDownArray[indexPath.row]].businessName
cell4?.layer.cornerRadius = 11
print("collectionviewsit")
return cell4!
}
else if collectionView == otherThanFoodCollectionView {
let cell5 = collectionView.dequeueReusableCell(withReuseIdentifier: "theOthers", for: indexPath) as? OtherCollectionViewCell
cell5?.otherCompanyLikedImage.image = UIImage(named: allDiscounts.list[otherArray[indexPath.row]].imageName)
cell5?.otherCompanyLikedName.text = allDiscounts.list[otherArray[indexPath.row]].businessName
cell5?.layer.cornerRadius = 11
print("collectionviewother")
return cell5!
}
else {
let cell6 = collectionView.dequeueReusableCell(withReuseIdentifier: "allDeals", for: indexPath) as? allDealsCollectionViewCell
cell6?.companyLikedImage1.image = UIImage(named: allDiscounts.list[indexPath.row].imageName)
cell6?.companyLikedName1.text = allDiscounts.list[indexPath.row].businessName
cell6?.layer.cornerRadius = 11
print("collectionviewall")
return cell6!
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if collectionView == self.myFavoritesCollectionView {
// handle tap events
ViewController.searchStruct.buttonTag = myEmptyArray[indexPath.row]
performSegue(withIdentifier: "gotocompany1", sender: self)
}
else if collectionView == self.fastFoodCollectionView {
ViewController.searchStruct.buttonTag = fastFoodArray[indexPath.row]
performSegue(withIdentifier: "gotocompany1", sender: self)
}
else if collectionView == self.DessertsCollectionView {
ViewController.searchStruct.buttonTag = dessertsArray[indexPath.row]
performSegue(withIdentifier: "gotocompany1", sender: self)
}
else if collectionView == self.sitDownRestrauntsCollectionView {
ViewController.searchStruct.buttonTag = sitDownArray[indexPath.row]
performSegue(withIdentifier: "gotocompany1", sender: self)
}
else if collectionView == self.otherThanFoodCollectionView {
ViewController.searchStruct.buttonTag = otherArray[indexPath.row]
performSegue(withIdentifier: "gotocompany1", sender: self)
}
else {
ViewController.searchStruct.buttonTag = indexPath.row
performSegue(withIdentifier: "gotocompany1", sender: self)
}
}
}
理想情况下，如果代码正常运行，将有一个UIViewController，其中有6个UICollectionViews，它们会水平滚动并显示不同的项目。