我的应用程序中有一个搜索字段，用户可以在其中搜索其他用户。但是我有三个问题:
目前，搜索仅适用于用户名大写的用户。例如，当我搜索“Ma”时，显示的唯一用户是“Makelele”，因为他的用户名的第一个字母是大写字母。例如，“mattgilbert”根本没有显示，即使我应该在桌面 View 上。
当用户出现在 TableView 中时，即使我取消了搜索，用户仍然在 TableView 中。
我拥有它，因此仅当用户输入至少 2 个单词时才开始搜索用户，但是如果用户在搜索字段中输入的单词超过该数量，则用户将消失在表格 View 中。我必须搜索更多字母才能让用户再次出现。
如果有人能帮助我解决这个问题，那就意义重大了，因为我在这个搜索上花了很多时间。我希望它尽可能具有成本效益，同时可扩展(因此为什么我在数据库运行查询之前至少输入这两个字母)
这是我的代码:
class FollowUsersTableViewController: UIViewController {
@IBOutlet var tableView: UITableView!
var isSearching = false
private var viewIsHiddenObserver: NSKeyValueObservation?
let searchController = UISearchController(searchResultsController: nil)
var usersArray = [UserModel]()
var filteredUsers = [UserModel]()
var loggedInUser: User?
//
var databaseRef = Database.database().reference()
//usikker på den koden over
override func viewDidLoad() {
super.viewDidLoad()
searchController.searchBar.delegate = self
//large title
self.title = "Discover"
if #available(iOS 11.0, *) {
self.navigationController?.navigationBar.prefersLargeTitles = true
} else {
// Fallback on earlier versions
}
self.tableView?.delegate = self
self.tableView?.dataSource = self
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
self.searchController.delegate = self;
definesPresentationContext = true
tableView.tableHeaderView = searchController.searchBar
//self.loadProfileData()
//self.searchBar(searchController.searchBar, textDidChange: searchController.searchBar.text)
}
func searchUsers(text: String) {
if text.count >= 2 {
self.usersArray = [] //clear the array each time
let endingText = text + "\u{f8ff}"
databaseRef.child("profile").queryOrdered(byChild: "username")
.queryStarting(atValue: text)
.queryEnding(atValue: endingText)
.observeSingleEvent(of: .value, with: { snapshot in
for child in snapshot.children {
let childSnap = child as! DataSnapshot
print(childSnap)
let userObj = Mapper<UserModel>().map(JSONObject: childSnap.value!)
userObj?.uid = childSnap.key
if childSnap.key != self.loggedInUser?.uid { //ignore this user
self.usersArray.append(userObj!)
}
}
self.tableView.reloadData()
})
}
} //may need an else statement here to clear the array when there is no text
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let dest = segue.destination as! UserProfileViewController
let obj = sender as! UserModel
let dict = ["uid": obj.uid!, "username": obj.username!, "photoURL": obj.photoURL, "bio": obj.bio]
dest.selectedUser = dict as [String : Any]
}
}
// MARK: - tableview methods
extension FollowUsersTableViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return isSearching ? filteredUsers.count : usersArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! FollowTableViewCell
let user = isSearching ? filteredUsers[indexPath.row] : usersArray[indexPath.row]
cell.title?.text = user.username
if let url = URL(string: user.photoURL ?? "") {
cell.userImage?.sd_setImage(with: url, placeholderImage: #imageLiteral(resourceName: "user_male"), options: .progressiveDownload, completed: nil)
cell.userImage.sd_setIndicatorStyle(.gray)
cell.userImage.sd_showActivityIndicatorView()
}
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.performSegue(withIdentifier: "user", sender: isSearching ? self.filteredUsers[indexPath.row] : self.usersArray[indexPath.row])
}
}
// MARK: - search methods
extension FollowUsersTableViewController:UISearchResultsUpdating, UISearchControllerDelegate, UISearchBarDelegate {
func updateSearchResults(for searchController: UISearchController) {
searchController.searchResultsController?.view.isHidden = false
self.searchUsers(text: self.searchController.searchBar.text!)
filterContent(searchText: self.searchController.searchBar.text!)
self.tableView.reloadData()
}
func filterContent(searchText:String){
if searchText.count >= 2{
self.filteredUsers = self.usersArray.filter{ user in
return(user.username!.lowercased().contains(searchText.lowercased()))
}
}
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
isSearching = true
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
isSearching = false
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
isSearching = false
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
isSearching = false
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
self.filteredUsers = self.usersArray.filter{ user in
return(user.username!.lowercased().contains(searchText.lowercased()))
}
if(filteredUsers.count == 0){
isSearching = false
} else {
isSearching = true
}
self.tableView.reloadData()
}
}
编辑:更新代码
class FollowUsersTableViewController: UIViewController {
@IBOutlet var tableView: UITableView!
var isSearching = false
private var viewIsHiddenObserver: NSKeyValueObservation?
let searchController = UISearchController(searchResultsController: nil)
var usersArray = [UserModel]()
var loggedInUser: User?
//
var databaseRef = Database.database().reference()
//usikker på den koden over
override func viewDidLoad() {
super.viewDidLoad()
searchController.searchBar.delegate = self
//large title
self.title = "Discover"
if #available(iOS 11.0, *) {
self.navigationController?.navigationBar.prefersLargeTitles = true
} else {
// Fallback on earlier versions
}
self.tableView?.delegate = self
self.tableView?.dataSource = self
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
self.searchController.delegate = self;
definesPresentationContext = true
tableView.tableHeaderView = searchController.searchBar
//self.loadProfileData()
//self.searchBar(searchController.searchBar, textDidChange: searchController.searchBar.text)
}
func searchUsers(text: String) {
if text.count >= 2 {
self.usersArray = [] //clear the array each time
let endingText = text + "\u{f8ff}"
databaseRef.child("profile").queryOrdered(byChild: "username")
.queryStarting(atValue: text)
.queryEnding(atValue: endingText)
.observeSingleEvent(of: .value, with: { snapshot in
for child in snapshot.children {
let childSnap = child as! DataSnapshot
print(childSnap)
let userObj = Mapper<UserModel>().map(JSONObject: childSnap.value!)
userObj?.uid = childSnap.key
if childSnap.key != self.loggedInUser?.uid { //ignore this user
self.usersArray.append(userObj!)
}
}
self.tableView.reloadData()
})
}
} //may need an else statement here to clear the array when there is no text
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let dest = segue.destination as! UserProfileViewController
let obj = sender as! UserModel
let dict = ["uid": obj.uid!, "username": obj.username!, "photoURL": obj.photoURL, "bio": obj.bio]
dest.selectedUser = dict as [String : Any]
}
}
// MARK: - tableview methods
extension FollowUsersTableViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return usersArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! FollowTableViewCell
let user = usersArray[indexPath.row]
cell.title?.text = user.username
if let url = URL(string: user.photoURL ?? "") {
cell.userImage?.sd_setImage(with: url, placeholderImage: #imageLiteral(resourceName: "user_male"), options: .progressiveDownload, completed: nil)
cell.userImage.sd_setIndicatorStyle(.gray)
cell.userImage.sd_showActivityIndicatorView()
}
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.performSegue(withIdentifier: "user", sender: self.usersArray[indexPath.row])
}
}
// MARK: - search methods
extension FollowUsersTableViewController:UISearchResultsUpdating, UISearchControllerDelegate, UISearchBarDelegate {
func updateSearchResults(for searchController: UISearchController) {
searchController.searchResultsController?.view.isHidden = false
self.searchUsers(text: self.searchController.searchBar.text!)
//filterContent(searchText: self.searchController.searchBar.text!)
self.tableView.reloadData()
}
/*
func filterContent(searchText:String){
if searchText.count >= 2{
self.filteredUsers = self.usersArray.filter{ user in
return(user.username!.lowercased().contains(searchText.lowercased()))
}
}
}
*/
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
isSearching = true
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
isSearching = false
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
isSearching = false
self.usersArray = []
self.tableView.reloadData()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
isSearching = false
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
self.usersArray.filter{ user in
return(user.username!.lowercased().contains(searchText.lowercased()))
}
if(usersArray.count == 0){
isSearching = false
} else {
isSearching = true
}
self.tableView.reloadData()
}
}
最佳答案
请尝试一下，它可能对您有帮助。
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
let filteredArray = usersArray.filter { ($0["username"] as! String).range(of: searchText!, options: [.diacriticInsensitive, .caseInsensitive]) != nil }
}
也许对你有帮助，谢谢
关于swift - 搜索字段和表格 View - 仅显示用户名大写的用户，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54146388/