我一直在研究一个使用两个UICollectionView的项目，那就是MainViewController，其中全屏单元格可以水平滚动，另一个可以放在全屏幕单元格上并垂直滚动。我有一个功能，可以添加和删除单元格。当用户点击并使用下面的代码删除MainViewController的其中一个页面时，仍会保留添加单元格时增长的内存。我做错了吗？我的所有代表都是弱引用，我的单元格都没有自引用闭包。我做错了什么，谢谢你的帮助
这是完整的项目
https://github.com/TheRedCamaro30/Leaky-Nested-UICollectionViews
添加或删除Cell Delegate
func addCell(){
self.mainCollectionView.performBatchUpdates({
guard let last = arr.last else{
return
}
arr.append(last + 1)
let lastIndex = IndexPath(item: last, section: 0)
self.mainCollectionView.insertItems(at: [lastIndex])
}) { (completed) in
print("Batch updates completed, performed successfully: \(completed)")
}
}
func removeCell() {
self.mainCollectionView.performBatchUpdates({
arr.popLast()
self.mainCollectionView.deleteItems(at: [IndexPath(item: arr.count - 1, section: 0)])
}) { (competed) in
print("Perform batch updates completed")
}
}
全尺寸细胞群
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: FullPageCell.reuseIdentifier, for: indexPath) as? FullPageCell else{
assertionFailure("Fatal Error FullPageCell not dequed")
return UICollectionViewCell()
}
cell.backgroundColor = UIColor.green
cell.cellTappedDelegate = self
return cell
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
if let cell = cell as? FullPageCell{
cell.setUpCollectionView()
}
}
SubCollectionView坐在整页细胞群中
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: SmallCell.reuseIdentifier, for: indexPath) as? SmallCell else{
assertionFailure("Fatal Error FullPageCell not dequed")
return UICollectionViewCell()
}
cell.backgroundColor = UIColor.yellow
cell.imageView.image = self.image
return cell
}
设置CollectionView
func setUpCollectionView(){
let view = self.contentView
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 1
layout.minimumInteritemSpacing = 1
layout.scrollDirection = .vertical
layout.itemSize = CGSize(width: (view.bounds.width - 2)/3, height: (view.bounds.width - 2)/3)
collectionView = UICollectionView(frame:view.bounds, collectionViewLayout: layout)
collectionView.dataSource = self
collectionView.delegate = self
collectionView.register(SmallCell.self, forCellWithReuseIdentifier: SmallCell.reuseIdentifier)
collectionView.backgroundColor = UIColor.white
self.collectionView.isPagingEnabled = true
view.addSubview(collectionView)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true
collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0).isActive = true
collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0).isActive = true
}
要插入，删除或移动单个部分或项目，您必须执行以下步骤：
- 更新数据源对象中的数据。
- 调用集合视图的相应方法以插入或删除节或项。
只需用以下代码替换removeCell方法即可。
func removeCell() {
self.mainCollectionView.performBatchUpdates({
arr.popLast()
self.mainCollectionView.deleteItems(at: [IndexPath(item: arr.count - 1, section: 0)])
}) { (competed) in
print("Perform batch updates completed")
//If it is not worked then reload collectionview
//self.mainCollectionView.reloadData()
}
}
请参考以下参考资料。