I am currently trying to display firebase objects in my tableview. However, I am only getting empty prototype cells. Thanks if you can take a glance at it!
import UIKit
import Firebase
class UsersTableViewController: UITableViewController {
var user = [User]()
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func getusers() {
let userID = Auth.auth().currentUser?.uid
let rootRef = Database.database().reference()
let query = rootRef.child("users").queryOrdered(byChild: "fullname")
query.observe(.value) { (snapshot) in
for child in snapshot.children.allObjects as! [DataSnapshot] {
if let value = child.value as? NSDictionary {
let userToShow = User()
let fullname = value["fullname"] as? String ?? "Name not found"
let uid = value["uid"] as? String ?? "uid not found"
userToShow.fullname = fullname
userToShow.userID = uid
self.user.append(userToShow)
DispatchQueue.main.async { self.tableView.reloadData() }
}
}
}
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return user.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "userCell", for: indexPath) as! TableViewCell
cell.nameLabel.text = self.user[indexPath.row].fullname
cell.userID = self.user[indexPath.row].userID
cell.userImage.downloadImage(from: self.user[indexPath.row].imagePath!)
return cell
}
}
extension UIImageView {
#objc func downloadImage(from imgURL: String!) {
let url = URLRequest(url: URL(string: imgURL)!)
let task = URLSession.shared.dataTask(with: url) {
(data, response, error) in
if error != nil {
print(error!)
return
}
DispatchQueue.main.async {
self.image = UIImage(data: data!)
}
}
task.resume()
}}
Thanks again for anyone willing to help! I am currently using Swift 4 with Google's Firebase API.
p.s. I know that I have connected delegate and dataSource. I am also sure that I have properly titled my Identifier. Thanks!
Related
I am trying to retrieve information stored in a Firebase Database, but my tableview is not displaying the information. I have tried using print functions to see if the data is being retrieved, and it shows that this is the case, but the tableview shows up as blank when I run the simulator.
I am using Xcode 11 and every tutorial that I have looked at is not working for some reason.
Here is my code:
import UIKit
import Firebase
import FirebaseDatabase
import SwiftKeychainWrapper
import FirebaseAuth
class FeedVC: UITableViewController {
var currentUserImageUrl: String!
var posts = [postStruct]()
var selectedPost: Post!
override func viewDidLoad() {
super.viewDidLoad()
getUsersData()
getPosts()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func getUsersData(){
guard let userID = Auth.auth().currentUser?.uid else { return }
Database.database().reference().child("users").child(userID).observeSingleEvent(of: .value) { (snapshot) in
if let postDict = snapshot.value as? [String : AnyObject] {
self.tableView.reloadData()
}
}
}
struct postStruct {
let firstName : String!
let lastName : String!
}
func getPosts() {
let databaseRef = Database.database().reference()
databaseRef.child("profiles").queryOrderedByKey().observeSingleEvent(of: .childAdded, with: {
snapshot in
let firstName = (snapshot.value as? NSDictionary)!["profileForename"] as? String
let lastName = (snapshot.value as? NSDictionary
)!["profileSurname"] as? String
print(firstName)
self.posts.append(postStruct(firstName: firstName, lastName: lastName))
print(self.posts)
DispatchQueue.main.async {
self.tableView.reloadData()
}
})
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? PostCell else { return UITableViewCell() }
let nameLabel = cell.viewWithTag(1) as! UILabel
nameLabel.text = posts[indexPath.row].firstName
return cell
}
}
Any help would be much appreciated!
Update: Since PostCell is created in the storyboard within the table view it's registered and dequeued successfully. So the issue is being narrowed down to the label with tag 1. Try creating an #IBOutlet for the label and use that to set the text of UILabel.
Then in cellForRowAt:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? PostCell else { return UITableViewCell() }
cell.firstNameLabel.text = posts[indexPath.row].firstName
return cell
}
Previous: You seem to have forgotten to register the PostCell.
override func viewDidLoad() {
super.viewDidLoad()
//...
tableView.register(PostCell.self, forCellReuseIdentifier: "PostCell")
}
Note: If you've created PostCell in Xib use nib registry method.
Update: If you want to register with Nib method use:
tableView.register(UINib(nibName: <#T##String#>, bundle: nil), forCellReuseIdentifier: "PostCell") // provide the xib file name at the placeholder
I want to connect my TableView to what I query from Firestore. The query works, but I can't get the TableView to show the content. Right now its just a blank tableView. The TableViewCell file also has no issues, since it worked before without the firebase implementation (The Cell is registered correctly).
I suspect that the issue is in cellForRowAt and tried played around in there, but couldn't get anything to work.
Can you find the issue?
import UIKit
import Firebase
class popularViewController: UIViewController, UITableViewDelegate, UITableViewDataSource{
#IBOutlet var table: UITableView!
var texttt = [TextPost]()
override func viewDidLoad() {
super.viewDidLoad()
gettingPosts()
table.register(textTableViewCell.nib(), forCellReuseIdentifier: textTableViewCell.identifier)
table.delegate = self
table.dataSource = self
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)
gettingPosts()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let alle = models.count + texttt.count
return alle
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: textTableViewCell.identifier, for: indexPath) as! textTableViewCell
cell.configure(with: texttt[indexPath.row])
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 300
}
func gettingPosts(){
let db = Firestore.firestore()
let postsRef = db.collection("posts")
postsRef.addSnapshotListener { (querySnapshot, error) in
guard let snapshot = querySnapshot else {
print("Error fetching snapshots: \(error!)")
return
}
snapshot.documentChanges.forEach { diff in
if (diff.type == .added){
let data = diff.document.data()
let Name = data["username"] as! String
let text = data["description"] as! String
let likes = data["likes"] as! Int
let typ = data["postType"] as! Int
let pfp = data["profileImage"] as! String
let uid = data["uid"] as! String
let pic = data["picture"]
let time = data["time"] as! String
if typ == 0{ // Text post
let dasDing = TextPost(numberOfComments: 0, username: Name, timestampName: time, userImageName: pfp, textName: text)
self.texttt.append(dasDing)
}
}
}
}
}
}
struct TextPost {
let numberOfComments: Int
let username: String
let timestampName: String
let userImageName: String
let textName: String
}
You need to reload data once you get data from firebase
func gettingPosts(){
let db = Firestore.firestore()
let postsRef = db.collection("posts")
postsRef.addSnapshotListener { (querySnapshot, error) in
guard let snapshot = querySnapshot else {
print("Error fetching snapshots: \(error!)")
return
}
snapshot.documentChanges.forEach { diff in
if (diff.type == .added){
let data = diff.document.data()
let Name = data["username"] as! String
let text = data["description"] as! String
let likes = data["likes"] as! Int
let typ = data["postType"] as! Int
let pfp = data["profileImage"] as! String
let uid = data["uid"] as! String
let pic = data["picture"]
let time = data["time"] as! String
if typ == 0{ // Text post
let dasDing = TextPost(numberOfComments: 0, username: Name, timestampName: time, userImageName: pfp, textName: text)
self.texttt.append(dasDing)
}
}
}
DispatchQueue.main.async {
tableView.reloadData()
}
}
}
I rewrote all the text and now I got the code I wanted to realize.
It can not be displayed on the tableCell, and the layout also collapses. I am sorry that the code and the body I wrote are not explained enough.
guard let userID = Auth.auth (). currentUser? .uid I want to always acquire userID with else {return}.
// guard let docSnapshot = querySnapshot, document.exists else {return}
Since an error occurs, it is commented out.
Within viewidLoad of UIViewController
var profDict: [ProfDic] = [] is in the UIViewController.
profUIView is being added to UIViewController.
func getFirebaseData() {
db = Firestore.firestore()
guard let userID = Auth.auth().currentUser?.uid else {return}
let ref = db.collection("users").document(userID)
ref.getDocument{ (document, error) in
if let document = document {
// guard let docSnapshot = querySnapshot, document.exists else {return}
if let prof = ProfDic(dictionary: document.data()!) {
self.profDict.append(prof)
print("Document data \(document.data())")
}
}else{
print("Document does not exist")
}
self.profUIView.tableView1.reloadData()
}
}
tableView1 has been added to ProfUIView.
class ProfUIView: UIView, UITableViewDelegate, UITableViewDataSource {
//omission...
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .blue
addSubview(tableView1)
tableView1.anchor(top: //omission...
sections = [
Section(type: .prof_Sec, items: [.prof]),
Section(type: .link_Sec, items: [.link]),
Section(type: .hoge_Sec, items: [.hoge0])
]
tableView1.register(TableCell0.self, forCellReuseIdentifier: TableCellId0)
tableView1.register(TableCell3.self, forCellReuseIdentifier: TableCellId3)
tableView1.register(TableCell5.self, forCellReuseIdentifier: TableCellId5)
tableView1.delegate = self
tableView1.dataSource = self
}
var tableView1:UITableView = {
let table = UITableView()
table.backgroundColor = .gray
return table
}()
//omission
func numberOfSections(in tableView: UITableView) -> Int {
return sections.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (baseVC?.profDict.count)!//sections[section].items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
switch sections[indexPath.section].items[indexPath.row] {
case .prof:
let cell0 = tableView.dequeueReusableCell(withIdentifier: TableCellId0, for: indexPath) as? TableCell0
cell0?.nameLabel.text = baseVC?.profDict[indexPath.row].userName
return cell0!
}
//omission...
}
}
Additional notes
import Foundation
import FirebaseFirestore
struct ProfDic {
var userName :String
var dictionary:[String:Any] {
return
["userName" : userName
]
}
}
extension ProfDic {
init?(dictionary:[String:Any]) {
guard let userName = dictionary["userName"] as? String
else {return nil}
self.init(userName: userName as String)
}
}
enter image description here
First create an empty array of ProfDic elements:
var profDict: [ProfDic] = []
Then create a function to load your Firebase Data:
func getFirebaseData() {
db = Firestore.firestore()
let userRef = db.collection("users").getDocuments() {
[weak self] (querySnapshot, error) in
for document in querySnapshot!.documents {
guard let docSnapshot = docSnapshot, docSnapshot.exists else {return}
if let prof = ProfDic(dictionary: docSnapshot.data()!) {
profDict.append(prof)
}
}
tableView.reloadData()
}
}
Call this function in viewDidLoad or viewDidAppear.
Then in tableView cellForRowAt you access your data like this:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
switch sections[indexPath.section].items[indexPath.row] {
case .prof:
let cell = tableView.dequeueReusableCell(withIdentifier: TableCellId, for: indexPath) as? TableCell
cell?.nameLabel.text = profDict[indexPath.row].userName
return cell!
}
}
EDIT:
Also in numberOfRowsInSection:
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return profDict.count
}
I am having a problem with my tableview not showing prototype cells. I have properly named each cell and Identifier. Here is my current code: (Thanks!)
import UIKit
import Firebase
import FirebaseDatabase
class UsersTableViewController: UITableViewController {
#IBOutlet var tableview: UITableView!
var ref: DatabaseReference!
var user = [User]()
override func viewDidLoad() {
super.viewDidLoad()
getusers()
// Do any additional setup after loading the view.
}
func getusers() {
let ref = Database.database().reference()
ref.child("users").child(Auth.auth().currentUser!.uid).queryOrderedByKey().observeSingleEvent(of: .value, with: { (snapshot) in
let users = snapshot.value as? [String : AnyObject] ?? [:]
for (_, value) in users
{
if let uid = users["uid"] as? String
{
if uid != Auth.auth().currentUser!.uid
{
let showUser = User()
if let fullname = users["fullname"] as? String, let imagePath = users["urlImage"] as? String
{
showUser.fullname = fullname
showUser.imagePath = imagePath
showUser.userID = uid
self.user.append(showUser)
}
}
}
}
self.tableview.reloadData()
})
ref.removeAllObservers()
}
override func numberOfSections(in tableview: UITableView) -> Int {
return 1
}
override func tableView(_ tableview: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! UserCell
cell.nameLabel.text = self.user[indexPath.row].fullname
cell.UserID = self.user[indexPath.row].userID
cell.userImage.downloadImage(from: self.user[indexPath.row].imagePath!)
checkFollowing(indexPath: indexPath)
return cell
}
override func tableView(_ tableview: UITableView, numberOfRowsInSection section: Int) -> Int {
return user.count
}
override func tableView(_ tableview: UITableView, didSelectRowAt indexPath: IndexPath) {
let uid = Auth.auth().currentUser!.uid
let ref = Database.database().reference()
let key = ref.child("users").childByAutoId().key
var isFollower = false
ref.child("users").child(uid).child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
if let following = snapshot.value as? [String : AnyObject] {
for (ke, value) in following {
if value as! String == self.user[indexPath.row].userID {
isFollower = true
ref.child("users").child(uid).child("following/\(ke)").removeValue()
ref.child("users").child(self.user[indexPath.row].userID).child("followers/\(ke)").removeValue()
self.tableview.cellForRow(at: indexPath)?.accessoryType = .none
}
}
}
if !isFollower {
let following = ["following/\(key)" : self.user[indexPath.row].userID]
let followers = ["followers/\(key)" : uid]
ref.child("users").child(uid).updateChildValues(following)
ref.child("users").child(self.user[indexPath.row].userID).updateChildValues(followers)
self.tableview.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
})
ref.removeAllObservers()
}
func checkFollowing(indexPath: IndexPath) {
let uid = Auth.auth().currentUser!.uid
let ref = Database.database().reference()
ref.child("users").child(uid).child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
if let following = snapshot.value as? [String : AnyObject] {
for (_, value) in following {
if value as! String == self.user[indexPath.row].userID {
self.tableview.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
}
}
})
ref.removeAllObservers()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
I am currently using Google's Firebase API for user storage. In this code I am trying to fetch users to my tableview, only my table view is not displaying any information. Thank you in advance if you are able to help!
Remove ref.removeAllObservers() line. Method observeSingleEvent removes observers automatically after completion execution. So in your case ref.removeAllObservers() can remove them before completion invokes and therefore any code in completion doesn't execute.
class ProductTableViewController: UITableViewController
{
var products = [Product]()
override func viewDidLoad() {
super.viewDidLoad()
getData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return products.count // zero
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ProductCell", for: indexPath) as! ProductCell
cell.userIdLabel?.text = "user id" + "$\(products[indexPath.row].userId)"
cell.idLabel?.text = "id" + "$\(products[indexPath.row].id)"
cell.titleLabel?.text = products[indexPath.row].title
cell.bodyLabel?.text = products[indexPath.row].body
return cell
}
func getData(){
let url = URL(string: "https://jsonplaceholder.typicode.com/posts")
URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
guard let data = data, error == nil else { return }
do {
let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [[String:Any]]
for post in json{
let product = Product()
product.userId = post["userId"] as! Int
product.id = post["id"] as! Int
product.title = post["title"] as! String
product.body = post["body"] as! String
self.products.append(product)
}
//OperationQueue.main.addOperation({ () -> Void in self.tableView.reloadData()})
} catch let error as NSError {
print(error)
}
//HERE!!!
OperationQueue.main.addOperation({ () -> Void in self.tableView.reloadData()})
}).resume()
}
}
When my UITableViewController executed first of all will implement func tableView and he will return zero count cause getData() didn't run yet and of course second tableView who returning my Cell will not implement.
And now, I wanna see what parsed my getData() in order to do I try to reload my tableView with OperationQueue.main.addOperation({ () -> Void in self.tableView.reloadData()})but caught an error :
Thread1 :SIGABRT.
How I should correctly reload my tableView?
Try this
func getData(){
let url = URL(string: "https://jsonplaceholder.typicode.com/posts")
URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
guard let data = data, error == nil else { return }
do {
let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [[String:Any]]
for post in json{
let product = Product()
product.userId = post["userId"] as! Int
product.id = post["id"] as! Int
product.title = post["title"] as! String
product.body = post["body"] as! String
self.products.append(product)
}
// just reload here after finish appends
self.tableView.reloadData()
} catch let error as NSError {
print(error)
}
}).resume()
}