如何从特定的 UICollectionViewCell 中删除 firebase 子节点 - Swift
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【中文标题】如何从特定的 UICollectionViewCell 中删除 firebase 子节点 - Swift【英文标题】：How to remove a firebase child node from a specific UICollectionViewCell - Swift 【发布时间】：2018-10-31 17:49:35 【问题描述】：我有一个UICollectionView which looks like this image 并有以下data structure in Firebase。
我希望用户能够从收藏视图中删除单个帖子，然后从 firebase 中删除。我在其他 *** 帖子上看到说 我必须使用 firebase 中的 .removeValue，但 不知道如何获取对随机子项的引用才能删除它.
如何访问每个帖子的 autoId 值，例如“LPmNrvzu-aXsw_u-rEF”，以便从 Firebase 中删除该子节点？
这是我用来从 Firebase 加载所有用户帖子的路径：
@objc func observeUserPosts()
let uid = Auth.auth().currentUser?.uid
let postsRef = Database.database().reference().child("posts").queryOrdered(byChild: "author/userid")
postsRef.queryEqual(toValue: uid!).observe(.value) (snapshot) in
这是我加载所有 UICollectionView 代码的扩展
//extension - UICollectionView for user's posts
extension ProfileViewController: UICollectionViewDataSource,UICollectionViewDelegate
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
return postsuser.count
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
let cell: PostsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "postsCell", for: indexPath) as! PostsCollectionViewCell
cell.set(post: postsuser[indexPath.row])
cell.deletePostButton.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
cell.deletePostButton.tag = indexPath.row
return cell
@objc func buttonAction(sender: UIButton)
Database.database().reference().child("posts").queryOrdered(byChild: "author/userid").observe(.value) (snapshot) in
if let posts = snapshot.value as? [String: AnyObject]
for (key, _) in posts
// NOW HOW DO I REFERENCE THE CELL THAT THE USER CLICKS TO DELETE?
// postsuser[sender.tag]
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
let vc = storyboard?.instantiateViewController(withIdentifier: "profileUsersSelectedPostViewController") as? ProfileUsersSelectedPostViewController
self.navigationController?.pushViewController(vc!, animated: true)
vc?.selectedpostsuser = postsuser[indexPath.row]
【问题讨论】：
【参考方案1】：这就是我设法解决我提出的问题的方法......希望它有所帮助:)
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
let cell: PostsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "postsCell", for: indexPath) as! PostsCollectionViewCell
cell.set(post: postsuser[indexPath.row])
cell.deletePostButton.addTarget(self, action: #selector(buttonAction(sender:)), for: .touchUpInside)
cell.deletePostButton.tag = indexPath.row
return cell
@objc func buttonAction(sender: UIButton)
ProgressHUD.show("Un momento", interaction: true)
let uid = Auth.auth().currentUser?.uid
Database.database().reference().child("posts").queryOrdered(byChild: "author/userid").queryEqual(toValue: uid!).observe(.value) (snapshot) in
if let posts = snapshot.value as? [String: AnyObject]
if let posts = snapshot.value as? [String: AnyObject]
for (key, postReference) in posts
if let post = postReference as? [String: Any], let timestamp = post["timestamp"] as? TimeInterval, timestamp == self.postsuser[sender.tag].timestampDouble
Database.database().reference().child("posts").child(key).removeValue(completionBlock: (error, _) in
DispatchQueue.main.async
ProgressHUD.showSuccess("Tu imagen ha sido borrada...")
self.postsuser.remove(at: sender.tag)
self.postsCollectionView.reloadData()
self.refresher.endRefreshing()
)
【讨论】：
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