我有一个控制器（A），其集合视图具有2个单元类。其中一个（B）包含另一个Collection View。在做了一些研究之后，我仍然无法弄清楚如何更新（B）中的细胞（A）或其他地方以获得我想要的东西。
问题
（B）按下按钮时没有正确重新加载：按钮所绑定的单元格仍然可见，即使它在委托方法中从（A）中的userFriendRequests数组中删除了。作为奖励，我滚动到（B）中的新单元表示＆＃34;索引超出范围＆＃34;在cell.user = userFriendRequests[indexPath.row]行。
我有什么
控制器（A）
protocol UserFriendRequestsDelegate: class {
func didPressConfirmFriendButton(_ friendId: String?)
}
/...
fileprivate var userFriendRequests = [User]()
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if userFriendRequests.isEmpty == false {
switch indexPath.section {
case 0:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: friendRequestCellId, for: indexPath) as! UserFriendRequests
cell.userFriendRequests = userFriendRequests
cell.delegate = self
return cell
case 1:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! UserFriendCell
let user = users[indexPath.row]
cell.user = user
return cell
default:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! UserFriendCell
return cell
}
}
/...
extension AddFriendsController: UserFriendRequestsDelegate {
internal func didPressConfirmFriendButton(_ friendId: String?) {
guard let uid = FIRAuth.auth()?.currentUser?.uid, let friendId = friendId else {
return
}
let userRef = FIRDatabase.database().reference().child("users_friends").child(uid).child(friendId)
let friendRef = FIRDatabase.database().reference().child("users_friends").child(friendId).child(uid)
let value = ["status": "friend"]
userRef.updateChildValues(value) { (error, ref) in
if error != nil {
return
}
friendRef.updateChildValues(value, withCompletionBlock: { (error, ref) in
if error != nil {
return
}
self.setUpRequestsStatusesToConfirmed(uid, friendId: friendId)
DispatchQueue.main.async(execute: {
let index = self.currentUserFriendRequests.index(of: friendId)
self.currentUserFriendRequests.remove(at: index!)
for user in self.userFriendRequests {
if user.id == friendId {
self.userFriendRequests.remove(at: self.userFriendRequests.index(of: user)!)
}
}
self.attemptReloadOfCollectionView()
})
})
}
}
PS：self.attemptReloadOfCollectionView()是一个简单地使计时器无效的函数，将其设置为0.1秒，然后在（A）的集合视图上调用reloadData()。
CollectionViewCell（B）
weak var delegate: UserFriendRequestsDelegate?
var userFriendRequests = [User]()
/...
@objc fileprivate func confirmFriendButtonPressed(_ sender: UIButton) {
delegate?.didPressConfirmFriendButton(friendId)
}
/...
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userFriendRequests.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: friendRequestCellId, for: indexPath) as! FriendRequestCell
cell.user = userFriendRequests[indexPath.row]
return cell
}
/...
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
guard let firstName = userFriendRequests[indexPath.row].first_name, let lastName = userFriendRequests[indexPath.row].last_name, let id = userFriendRequests[indexPath.row].id else {
return
}
nameLabel.text = firstName + " " + lastName
friendId = id
confirmButton.addTarget(self, action: #selector(confirmFriendButtonPressed(_:)), for: .touchUpInside)
}
我想要实现的目标
更新（B）当从（A）中的User数组中移除userFriendRequests时，此User由他的id通过（B）通过一行。
任何有关如何解决这个问题的好主意？
提前感谢您的帮助！