我在firebase用户节点中搜索用户，当tableView中的心形按钮被选中时，我将所选用户uid添加到通知节点中。我想将当前用户的待处理好友请求显示为标记的accessoryView按钮。我在我的代码中设法得到了我想要的东西。但是当我使用searchController并搜索待定用户时，我的问题就出现了。当我研究或清除并取消searchBar时，未标记的用户accessoryView按钮显示为已标记。 gif version of my problem
我遗漏了一些我没有经历的事情，我需要帮助。
我搜索了这个主题，但仍然无法解决我的问题。
控制台输出：
Login successfully
UserUID: Bk6o3uUc3sX1W20PMdqbLQoTBWn2 - SenderTag: 0
UserUID: zfwYU7lpWHZwCf8O7wGaV2QMekz1 - SenderTag: 1
UserUID: e6G2axZQNNh9POI2Btkhvce0UXJ3 - SenderTag: 2
UserUID: dx96PxVpMoPqXPiUJEHJvtQmyJ82 - SenderTag: 3
UserUID: zfwYU7lpWHZwCf8O7wGaV2QMekz1 - Notification: true
import UIKit
import Firebase
class UserViewController: UITableViewController, UISearchBarDelegate, UISearchResultsUpdating {
let userView = UserView()
var ref: DatabaseReference!
var users = [User]()
var filterUsers = [User]()
let searchController = UISearchController(searchResultsController: nil)
override func loadView() {
// Do not call super!
self.view = userView
}
override func viewDidLoad() {
super.viewDidLoad()
// Delegate and DataSource for TableViewController
userView.delegate = self
userView.dataSource = self
fetchUsers()
setupSearchController()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
setupNavigationController()
}
// MARK: TableView Delegate
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "userCell", for: indexPath) as! UserCell
let user = searchController.isActive ? filterUsers[indexPath.row] : users[indexPath.row]
cell.textLabel?.text = user.name?.capitalized
cell.detailTextLabel?.text = user.email
cell.accessoryType = .detailDisclosureButton
cell.accessoryView = cell.beFriendButton
cell.beFriendButton.tag = indexPath.row
print("UserUID: \(user.uid!) - SenderTag: \(cell.beFriendButton.tag)")
observePendingStatus(userUID: user.uid!, sender: cell.beFriendButton)
cell.beFriendButton.addTarget(self, action: #selector(handleMarkAsFriend(sender:)), for: UIControlEvents.touchUpInside)
return cell
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchController.isActive ? filterUsers.count : users.count
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 72
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
}
// Setup UINavigationController
func setupNavigationController() {
// Hide backBarButtonTitle
navigationItem.backBarButtonItem = UIBarButtonItem(title:"", style:.plain, target:nil, action:nil)
// DismissView
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(dismissView))
navigationItem.hidesSearchBarWhenScrolling = false
tabBarController?.tabBar.isHidden = false
navigationController?.setNavigationBarHidden(false, animated: true)
navigationItem.hidesBackButton = false
navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.title = "Add Friends"
navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 34), NSAttributedStringKey.foregroundColor : UIColor.preferredColor(r: 0, b: 0, g: 0, a: 1)]
navigationController?.navigationBar.tintColor = UIColor.preferredColor(r: 255, b: 45, g: 85, a: 1)
}
@objc func dismissView() {
dismiss(animated: true, completion: nil)
}
// MARK: SearchController
func setupSearchController() {
// Search Bar for friend list
navigationItem.searchController = searchController
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
definesPresentationContext = true
searchController.hidesNavigationBarDuringPresentation = false
}
func updateSearchResults(for searchController: UISearchController) {
filterSearchController(searchBar: searchController.searchBar)
tableView.reloadData()
}
// MARK: Filter users in searchController
func filterSearchController(searchBar: UISearchBar) {
let searchText = searchBar.text ?? ""
filterUsers = users.filter { user in
let isMatchingSearchText = (user.name?.lowercased().contains(searchText.lowercased()))! || searchText.lowercased().count == 0
return isMatchingSearchText
}
tableView.reloadData()
}
// MARK: Fetch Users
func fetchUsers() {
ref = Database.database().reference()
let userRef = ref.child("users")
userRef.queryOrdered(byChild: "name").observe(DataEventType.childAdded, with: { (snapshot) in
guard let values = snapshot.value as? [String: AnyObject] else { return }
let user = User(dictionary: values)
user.uid = snapshot.key
self.users.append(user)
DispatchQueue.main.async(execute: {
self.tableView.reloadData()
})
}, withCancel: { (error) in
print(error.localizedDescription)
})
}
// MARK: Mark User
@objc func handleMarkAsFriend(sender: UIButton) {
var selectedUser = User()
selectedUser = searchController.isActive ? filterUsers[sender.tag] : users[sender.tag]
sender.isSelected = !sender.isSelected
guard let selectedUserUID = selectedUser.uid else { return }
if(sender.isSelected == true)
{
sender.tintColor = UIColor.preferredColor(r: 255, b: 45, g: 85, a: 1)
// Add user into notification node
sendFriendRequest(selectedUserUID: selectedUserUID)
print("SendFrientRequestTo: \(selectedUserUID) - ButtonTag: \(sender.tag)")
}
else
{
sender.tintColor = UIColor.preferredColor(r: 0, b: 0, g: 0, a: 1)
// Delete user from notification node
cancelFriendRequest(seletedUserUID: selectedUserUID)
print("CancelFriendRequest: \(selectedUserUID) - ButtonTag: \(sender.tag)")
}
}
// Mark: Send friend request
func sendFriendRequest(selectedUserUID: String) {
ref = Database.database().reference()
guard let fromID = Auth.auth().currentUser?.uid else { return}
let notificationRef = ref.child("notifications")
let timestamp = Int(Date().timeIntervalSince1970)
let values = ["timestamp" : timestamp, "pending": true] as [String : Any]
notificationRef.child(selectedUserUID).child(fromID).updateChildValues(values) { (error, databaseReference) in
if let error = error {
print(error.localizedDescription)
return
}
}
}
// Mark: Cancel friend request
func cancelFriendRequest(seletedUserUID: String) {
ref = Database.database().reference()
let notificationRef = ref.child("notifications")
guard let currentUserUID = Auth.auth().currentUser?.uid else { return }
notificationRef.child(seletedUserUID).child(currentUserUID).removeValue { (error, databaseReference) in
if let error = error {
print(error.localizedDescription)
}
}
}
// Mark: Observe Pending Status for friend request
func observePendingStatus(userUID: String, sender: UIButton) {
ref = Database.database().reference()
let notificationRef = ref.child("notifications")
guard let currentUserUID = Auth.auth().currentUser?.uid else { return }
notificationRef.child(userUID).child(currentUserUID).observe(DataEventType.value, with: { (snapshot) in
guard let values = snapshot.value as? [String: AnyObject] else { return }
let notification = NotificationModel(dictionary: values)
if let pending = notification.pending {
if pending {
print("UserUID: \(userUID) - Notification: \(pending)")
sender.isSelected = true
sender.tintColor = UIColor.preferredColor(r: 255, b: 45, g: 85, a: 1)
}
}
}, withCancel: { (error) in
print(error.localizedDescription)
})
}
}