Having trouble with custom cell not appearing and not showing data from firebase database - not sure which one is the problem, but I only get a bunch of non-custom cells in the tableview instead of caption and description.
I have tried to see the data threw print and nothing appearing, something wrong with my code? debugger not showing anything special.
import UIKit
import FirebaseDatabase
class SearchViewController: UIViewController, UISearchBarDelegate {
#IBOutlet weak var tableView: UITableView!
//part of load posts
var posts = [Post]()
func loadPosts(){
var posts = [Post]()
Database.database().reference().child("Posts").observe(.childAdded) {(snapshot: DataSnapshot) in
if let dict = snapshot.value as? [String: Any] {
let captionText = dict["caption"] as! String
let descriptionText = dict["description"] as! String
let photoUrlString = dict["photoUrl"] as! String
let tagsText = dict["tags"] as! String
let post = Post(captionText: captionText, descriptionText: descriptionText, photoUrlString: photoUrlString, tagsText: tagsText)
posts.append(post)
print(self.posts)
self.tableView.reloadData()
}
}
}
//part of SearchBar
let searchBar = UISearchBar()
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.endEditing(true)
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searchBar.endEditing(true)
}
override func viewDidLoad() {
super.viewDidLoad()
createSearchBar()
tableView.dataSource = self
tableView.delegate = self
loadPosts()
}
func createSearchBar(){
searchBar.showsCancelButton = false
searchBar.placeholder = "Enter Here"
searchBar.delegate = self
self.navigationItem.titleView = searchBar
}
}
//part of tableView
extension SearchViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier:"searchCell", for: indexPath)
as! CustomTableViewCell
cell.titleField?.text = posts[indexPath.row].caption
//cell.descriptionField?.text = posts.description
cell.tagsField?.text = posts[indexPath.row].tags
return cell
}
}
You have two data arrays named "posts." The outer, object scope one, never gets set. Remove the inner one.
Related
This question already has answers here:
Class 'ViewController' has no initializers in swift
(8 answers)
Closed last month.
import UIKit
import CoreData
class TableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var titleArray = [String]()
var idArray = [UUID()]
var chosenTitle = ""
var chosenTitleID : UUID
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.topItem?.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.add, target: self, action: #selector(addButtonClicked))
tableView.delegate = self
tableView.dataSource = self
getData()
}
func getData() {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Places")
request.returnsObjectsAsFaults = false
do {
let results = try context.fetch(request)
if results.count > 0 {
self.titleArray.removeAll(keepingCapacity: false)
self.idArray.removeAll(keepingCapacity: false)
for result in results as! [NSManagedObject] {
if let title = result.value(forKey: "title") as? String {
self.titleArray.append(title)
}
if let id = result.value(forKey: "id") as? UUID {
self.idArray.append(id)
}
tableView.reloadData()
}
}
} catch {
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell()
cell.textLabel?.text = titleArray[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return titleArray.count
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
chosenTitle = titleArray[indexPath.row]
chosenTitleID = idArray[indexPath.row]
performSegue(withIdentifier: "toDetailsVC", sender: nil)
}
I have a problem with Swift class. I have a swift file for UITableViewController class. I had "Class 'TableViewController' has no initializers" problem.
I didn't find anything but the code says TableViewController has no initializers. I don't understand this problem. I have version 14.2.
Thanks for your responses.
You can make chosenTitleID property optional(var chosenTitleID: UUID?) or provide the default value to chosenTitleID because TableViewController class contains non-optional property.
I am trying to filter custom UITableViewCells, based on one of the UILabels present in the cell.
All of the data is parsed from remote JSON, which has the model locally named Item and currently I am displaying the following in each cell successfully:
var titleLabel = UILabel()
var descriptionLabel = UILabel()
Also defined in my ItemTableViewCell class is:
func set(product: Item) {
DispatchQueue.main.async { [weak self] in
self?.titleLabel.text = item.title
self?.descriptionLabel.text = item.listPrice
}
}
These are called within my main View Controller, to which I have added a searchBar successfully and is visible within the app:
import Foundation
import UIKit
class ItemsListViewController: UIViewController {
var items = [Items]()
var itemsSearch: [Items] = []
var tableView = UITableView()
var searchController = UISearchController()
struct Cells {
static let itemCell = "ItemCell"
}
override func viewDidLoad() {
super.viewDidLoad()
configureTableView()
configureSearchController()
}
func configureSearchController() {
searchController = UISearchController(searchResultsController: nil)
navigationItem.searchController = searchController
navigationItem.hidesSearchBarWhenScrolling = false
searchController.searchBar.placeholder = "Search items"
definesPresentationContext = true
var isSearchBarEmpty: Bool {
return searchController.searchBar.text?.isEmpty ?? true
}
}
func configureTableView() {
view.addSubview(tableView)
setTableViewDelegates()
tableView.rowHeight = 100
tableView.pin(to: view)
tableView.register(itemTableViewCell.self, forCellReuseIdentifier: Cells.itemCell)
}
func setTableViewDelegates() {
tableView.delegate = self
tableView.dataSource = self
}
}
extension itemsListViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: Cells.itemCell) as! itemTableViewCell
let item = items[indexPath.row]
cell.set(item: item)
return cell
}
}
extension ItemsListViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
let searchBar = searchController.searchBar
}
}
How can I filter these cells so say for instance a user searches for "Food", the only items which return would be ones which have a cell titleLabel = "food"?
I've tried to implement a function similar to the below, however it fails to achieve what I am after:
func filterContentForSearchText(_ searchText: String, category: = nil) {
let cell = tableView.dequeueReusableCell(withIdentifier: Cells.productCell) as! ProductTableViewCell
productsSearch = products.filter { (cell: cell) -> Bool in
return products.name.lowercased().contains(searchText.lowercased())
}
tableView.reloadData()
}
Thanks in advance for any help here.
You can not filter TableViewCells. You have to filter your model data and instead of using UISearchResultsUpdating you should use UISearchBarDelegate
I have modified your code, check it.
class ItemsListViewController: UIViewController {
var items = [Items]()
var itemsSearch: [Items] = []
var filterActive = false
var tableView = UITableView()
var searchController = UISearchController()
struct Cells {
static let itemCell = "ItemCell"
}
override func viewDidLoad() {
super.viewDidLoad()
configureTableView()
configureSearchController()
}
func configureSearchController() {
searchController = UISearchController(searchResultsController: nil)
navigationItem.searchController = searchController
navigationItem.hidesSearchBarWhenScrolling = false
searchController.searchBar.placeholder = "Search items"
searchController.searchBar.delegate = self
definesPresentationContext = true
}
func configureTableView() {
view.addSubview(tableView)
setTableViewDelegates()
tableView.rowHeight = 100
tableView.pin(to: view)
tableView.register(itemTableViewCell.self, forCellReuseIdentifier: Cells.itemCell)
}
func setTableViewDelegates() {
tableView.delegate = self
tableView.dataSource = self
}
}
extension ItemsListViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filterActive ? itemsSearch.count : items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: Cells.itemCell) as! itemTableViewCell
let item = filterActive ? itemsSearch[indexPath.row] : items[indexPath.row]
cell.set(item: item)
return cell
}
}
extension ItemsListViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
filterItems(text: searchController.searchBar.text)
}
func filterItems(text: String?) {
guard let text = text else {
filterActive = false
self.tableView.reloadData()
return
}
self.itemsSearch = self.items.filter({ (item) -> Bool in
return item.title.lowercased().contains(text.lowercased())
})
filterActive = true
self.tableView.reloadData()
}
// Edited Version
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.text = nil
filterActive = false
self.tableView.reloadData()
}
}
You are doing it the wrong way.
You should not filter the cells, but instead filter the model (e.g. add and remove entries to the table view data source)
Then call reloadData - this will then access the filtered model (in cellForRowAt and create only the filtered amount of (visible) cells
To improve, use a diffable data source
My app is using Firebase Realtime Database to store information of each user. The tableView works fine. I added a searchBar and when I type letters in the searchBar, I can see that the amount of rows presented in the tableView is equal to the amount of users which contain these letters in their names. The problem is that the rows presented in the tableview (after typing letters in the search bar), contain the information of the first user till x user (x = amount of users which contain these letters in their names).
import UIKit
import FirebaseDatabase
import Firebase
class VideoListScreen: UIViewController {
#IBOutlet weak var tableView: UITableView!
var blogPost: [BlogPost] = []
var searchBlogPost = [BlogPost]()
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
blogPost = []
createArray()
tableView.delegate = self
tableView.dataSource = self
}
func createArray() {
let ref = Database.database().reference().child("Users")
ref.observe(.childAdded, with: { (snapshot) in
if let postDict = snapshot.value as? [String : String] {
let post = BlogPost(name:postDict["name"] ?? "" , gaf: postDict["gaf"] ?? "", place: postDict["place"] ?? "", phone: postDict["phone"] ?? "", notes: postDict["notes"] ?? "", elsertext: postDict["elsertext"] ?? "")
self.blogPost.append(post)
self.tableView.reloadData()
}
})
}
}
extension VideoListScreen: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching{
return searchBlogPost.count
}else{
return blogPost.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let blogp = blogPost[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Tavla") as! Tavla
if searching{
cell.setBLogPost(blogPost: searchBlogPost[indexPath.row])
}
else{
cell.setBLogPost(blogPost: blogPost[indexPath.row])
}
cell.setBLogPost(blogPost: blogp)
return cell
}
}
extension VideoListScreen: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
searchBlogPost = blogPost.filter({$0.name.prefix(searchText.count) == searchText})
searching = true
tableView.reloadData()
}
}
I Believe the problem is in the if and else statments in this function:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let blogp = blogPost[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Tavla") as! Tavla
if searching{
cell.setBLogPost(blogPost: searchBlogPost[indexPath.row])
}
else{
cell.setBLogPost(blogPost: blogPost[indexPath.row])
}
cell.setBLogPost(blogPost: blogp)
return cell
}
You have extra cell.setBLogPost(blogPost: blogp) in your delegate methode
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let blogp = blogPost[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Tavla") as! Tavla
if searching{
cell.setBLogPost(blogPost: searchBlogPost[indexPath.row])
}
else{
cell.setBLogPost(blogPost: blogPost[indexPath.row])
}
return cell
}
I think this will solve your problem and you can use
import UIKit
import FirebaseDatabase
import Firebase
class VideoListScreen: UIViewController {
#IBOutlet weak var tableView: UITableView!
var blogPost: [BlogPost] = []
var searchBlogPost = [BlogPost]()
override func viewDidLoad() {
super.viewDidLoad()
blogPost = []
createArray()
tableView.delegate = self
tableView.dataSource = self
}
func createArray() {
let ref = Database.database().reference().child("Users")
ref.observe(.childAdded, with: { (snapshot) in
if let postDict = snapshot.value as? [String : String] {
let post = BlogPost(name:postDict["name"] ?? "" , gaf: postDict["gaf"] ?? "", place: postDict["place"] ?? "", phone: postDict["phone"] ?? "", notes: postDict["notes"] ?? "", elsertext: postDict["elsertext"] ?? "")
self.blogPost.append(post)
self.searchBlogPost = self.blogPost
self.tableView.reloadData()
}
})
}
}
extension VideoListScreen: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchBlogPost.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let blogp = searchBlogPost[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Tavla") as! Tavla
cell.setBLogPost(blogPost: blogp)
return cell
}
}
extension VideoListScreen: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if ((searchText.trimmingCharacters(in: .whitespaces).isEmpty) {
searchBlogPost = blogPost
} else {
searchBlogPost = blogPost.filter({$0.name.prefix(searchText.count) == searchText})
}
tableView.reloadData()
}
}
I hope this will helps.
I started a table view with a list of universities and created a search bar to tag along with it. The search bar works but only if I type in the name of the school exactly how it is. Is there a way I can change the it to search any part of the name and get the same results? Here's the code that I have set up.
#IBOutlet weak var schoolSearch: UISearchBar!
#IBOutlet weak var tblView: UITableView!
let schoolnames = ["Long Beach City College LAC", "California State University, Bakersfield", ...]
var searchedSchool = [String]()
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
schoolSearch.delegate = self
self.tblView.delegate = self
self.tblView.reloadData()
}
extension ChooseSchool: UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching {
return searchedSchool.count
} else {
return schoolnames.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? TableViewCell
cell?.img.image = UIImage(named: schoolnames[indexPath.row])
cell?.lbl.text = schoolnames[indexPath.row]
_ = tableView.dequeueReusableCell(withIdentifier: "cell")
if searching {
cell?.textLabel?.text = searchedSchool[indexPath.row]
} else {
cell?.textLabel?.text = schoolnames[indexPath.row]
}
return cell!
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let vc = storyboard?.instantiateViewController(withIdentifier: "TestController") as? TestController
vc?.schoolnames = schoolnames[indexPath.row]
navigationController?.pushViewController(vc!, animated: true)
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
searchedSchool = schoolnames.filter({$0.lowercased().prefix(searchText.count) == searchText.lowercased()})
searching = true
tblView.reloadData()
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searching = false
searchBar.text = ""
tblView.reloadData()
}
}
Replace
searchedSchool = schoolnames.filter({$0.lowercased().prefix(searchText.count) == searchText.lowercased()})
with
searchedSchool = schoolnames.filter { $0.range(of: searchText, options: .caseInsensitive) != nil }
I think you have to make your searchBar implement the containsString method to achieve what you need. For reference look at this link
I am trying to make a UITableView display data from my firebase database which is in the following structure
I need the first label to display the shop's name and the shop's type. When I print the values from the database, it displays the list of the shops and the type next to it. However, I am finding it difficult to replicate this into the UITableView. Thank you for the help. Here is my code:
import UIKit
import Firebase
struct shopStruct {
let shopName: String!
let shopType : String!
}
class HomeViewController: UIViewController, UITableViewDataSource , UITableViewDelegate {
#IBOutlet weak var homeTableView: UITableView!
var databaseRef: DatabaseReference!
var shops = [shopStruct]()
override func viewDidLoad() {
super.viewDidLoad()
databaseRef = Database.database().reference()
databaseRef.child("shops").queryOrderedByKey().observe(.childAdded, with: { (snapshot) in
if let valueDictionary = snapshot.value as? [AnyHashable:String]
{
let shopName = valueDictionary["name"]
let shopType = valueDictionary["type"]
self.shops.insert(shopStruct(shopName: shopName, shopType: shopType), at: 0)
self.homeTableView.reloadData()
}
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return shops.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let label1 = cell.viewWithTag(1) as! UILabel
label1.text = shops[indexPath.row].shopName
let label2 = cell.viewWithTag(2) as! UILabel
label2.text = shops[indexPath.row].shopType
return cell
}
}
You have to set in viewDidLoad
self.homeTableView.dataSource = self
May be it's not working because you'r reloading the tablebview on secondary thread so could you please replace the code self.homeTableView.reloadData() with following code and try?
DispatchQueue.main.async {
self.homeTableView.reloadData()
}