I have made a small MVP test app with firebase. I have also made a ViewController that searches for users. But now i have to load up every user in the firebase project once the searchcontroller is clicked. And this is not very scalable. (the searchcontroller displays both the usernames of the users, and also the profile photo.
I have it so the user must type atleast two words before the searchcontroller starts showing content in the tableview. So maybe a solution is to only load the usernames upon clicked, and then only loading the profilepicture when the current user is displayed? If so , how can i achieve this?
class FollowUsersTableViewController: UIViewController{
@IBOutlet var tableView: UITableView!
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()
//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()
}
func loadProfileData() {
databaseRef.child("profile").queryOrdered(byChild: "username").observe(.childAdded, with: { (snapshot) in
print(snapshot)
let userObj = Mapper<UserModel>().map(JSONObject: snapshot.value!)
userObj?.uid = snapshot.key
guard snapshot.key != self.loggedInUser?.uid else { return }
self.usersArray.append(userObj!)
})
}
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 searchController.searchBar.text!.count >= 2 ?
filteredUsers.count : 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! FollowTableViewCell
let user = filteredUsers[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.filteredUsers[indexPath.row])
}
}
// MARK: - search methods
extension FollowUsersTableViewController:UISearchResultsUpdating,
UISearchControllerDelegate {
func updateSearchResults(for searchController: UISearchController) {
searchController.searchResultsController?.view.isHidden = false
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()))
}
}
}
}
You can use queryStartingAtValue :
func searchQueryUsers(text: String, completion: @escaping (_ userNames: [String]) -> Void) {
var userNames: [String] = []
databaseRef.child("profile").queryOrdered(byChild: "username").queryStarting(atValue: text).observeSingleEvent(of: .value, with: { snapshot in
for item in snapshot.children {
guard let item = item as? DataSnapshot else {
break
}
//"name" is a key for name in FirebaseDatabese model
if let dict = item.value as? [String: Any], let name = dict["name"] as? String {
userNames.append(name)
}
}
completion(userNames)
})
}
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