The background of the TableView at the bottom displays a blank cell - swift

Question

I have this UITableView that has xib files as cells and it all works as intended, however the last cell only when I scroll down doesn't have a background color. It only happens when I scroll down and then it pops back to normal position. I'm essentially wondering how I can change the color of that cell just to my background color. Thank you.
//
// BlogViewController.swift
// testAPI
//
// Created by Dilan Piscatello on 4/2/20.
// Copyright © 2020 Dilan Piscatello. All rights reserved.
//
import Foundation
import UIKit
import Firebase
class BlogViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
var x = 0
func numberOfSections(in tableView: UITableView) -> Int {
return 2
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 0{
return 1
}else{
return posts.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.section == 0{
let cell = Bundle.main.loadNibNamed("QuestionTableViewCell", owner: self, options: nil)?.first as! QuestionTableViewCell
print("this is how many times it ran")
cell.setPost(question: self.question)
return cell
}
else{
let cell = tableView.dequeueReusableCell(withIdentifier: "postcell", for: indexPath) as! PostTableViewCell
cell.setPost(post: posts[indexPath.row])
return cell
}
}
var question = "sdfsdfs"
var tableView:UITableView!
var lastUploadPostID:String?
var discussion:UILabel! = UILabel()
var posts = [Post]()
var fetchingMore = false
var endReached = false
let leadingScreensForBatching:CGFloat = 3.0
var cellHeights: [IndexPath:CGFloat] = [:]
var refreshControl:UIRefreshControl!
var postRef:DatabaseReference{
return Database.database().reference().child("posts")
}
var oldPostQuery:DatabaseQuery{
var queryRef:DatabaseQuery
let lastPost = self.posts.last
if lastPost == nil{
queryRef = postRef.queryOrdered(byChild: "timestamp")
}else{
let lastTimestamp = lastPost!.createdAt.timeIntervalSince1970*1000
queryRef = postRef.queryOrdered(byChild: "timestamp").queryEnding(atValue: lastTimestamp)
}
return queryRef
}
var newPostQuery:DatabaseQuery{
var queryRef:DatabaseQuery
let firstPost = self.posts.first
if firstPost == nil{
queryRef = postRef.queryOrdered(byChild: "timestamp")
}else{
let firstTimestamp = firstPost!.createdAt.timeIntervalSince1970*1000
queryRef = postRef.queryOrdered(byChild: "timestamp").queryStarting(atValue: firstTimestamp)
}
return queryRef
}
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
func hi(){
let db = Firestore.firestore()
db.collection("blog").document("question").getDocument { (document,error) in
if error != nil{
print("cant get data")
}
if document != nil && document!.exists{
if let documentdata = document?.data() {
self.question = documentdata["question"] as! String
self.tableView.reloadData()
}
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
discussion.text = "Discussion"
//longTitleLabel.font = ................
discussion.font = UIFont(name: "HelveticaNeue-Bold", size: 31)
discussion.translatesAutoresizingMaskIntoConstraints = false
if let navigationBar = self.navigationController?.navigationBar {
navigationBar.addSubview(discussion)
//navigationBar.shadowImage = UIImage()
// navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
// navigationBar.isTranslucent = true
navigationBar.barTintColor = UIColor( red: 128/255, green: 117/255, blue: 255/255, alpha: 1)
discussion.leftAnchor.constraint(equalTo: navigationBar.leftAnchor, constant: 22).isActive = true
discussion.widthAnchor.constraint(equalToConstant: 300).isActive = true
tableView = UITableView()
tableView.translatesAutoresizingMaskIntoConstraints = false
self.tableView.separatorStyle = .none
view.addSubview(tableView)
hi()
print(question)
// Do any additional setup after loading the view.
let cellNib = UINib(nibName: "PostTableViewCell", bundle: nil)
tableView.register(cellNib, forCellReuseIdentifier: "postcell")
var layoutGuide:UILayoutGuide!
layoutGuide = view.safeAreaLayoutGuide
tableView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 10).isActive = true
tableView.topAnchor.constraint(equalTo: view.topAnchor, constant: 40).isActive = true
tableView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -10).isActive = true
tableView.bottomAnchor.constraint(equalTo: layoutGuide.bottomAnchor).isActive = true
tableView.delegate = self
tableView.dataSource = self
tableView.tableFooterView = UIView()
tableView.reloadData()
refreshControl = UIRefreshControl()
tableView.refreshControl = refreshControl
refreshControl.addTarget(self, action: #selector(handleRefresh), for: .valueChanged)
beginBatchFetch()
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// if let navigationController = navigationController as? ScrollingNavigationController {
// navigationController.followScrollView(tableView, delay: 0.0)
//}
listenForNewPosts()
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
stopListeningForNewPosts()
}
#objc func handleRefresh(){
print()
newPostQuery.queryLimited(toFirst: 20).observeSingleEvent(of: .value, with: { (snapshot) in
var tempPosts = [Post]()
let firstPost = self.posts.first
for child in snapshot.children{
if let childSnapshot = child as? DataSnapshot,
let dict = childSnapshot.value as? [String:Any],
let post = Post.parse(childSnapshot.key, dict),
childSnapshot.key != firstPost?.id{
tempPosts.insert(post, at: 0)
}
}
self.posts.insert(contentsOf: tempPosts, at: 0)
self.tableView.reloadData()
self.refreshControl.endRefreshing()
//let newIndexPaths = (1..<tempPosts.count).map { i in
// return IndexPath(row: i, section: 1)
//}
//self.tableView.insertRows(at: newIndexPaths, with: .top)
// self.refreshControl.endRefreshing()
// self.tableView.scrollToRow(at: IndexPath(row:0,section: 0), at: .top, //animated:true)
//self.listenForNewPosts()
//return completion(tempPosts)
//self.posts = tempPosts
//self.tableView.reloadData()
})
}
func fetchPosts(completion: #escaping(_ posts:[Post])->()){
oldPostQuery.queryLimited(toLast: 20).observeSingleEvent(of: .value, with: { (snapshot) in
var tempPosts = [Post]()
let lastPost = self.posts.last
for child in snapshot.children{
if let childSnapshot = child as? DataSnapshot,
let dict = childSnapshot.value as? [String:Any],
let post = Post.parse(childSnapshot.key, dict),
childSnapshot.key != lastPost?.id{
tempPosts.insert(post, at: 0)
}
}
return completion(tempPosts)
//self.posts = tempPosts
//Zself.tableView.reloadData()
})
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
cellHeights[indexPath] = cell.frame.size.height
cell.selectionStyle = UITableViewCell.SelectionStyle.none
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return cellHeights[indexPath] ?? 72.0
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let offsetY = scrollView.contentOffset.y
let contentHeight = scrollView.contentSize.height
if offsetY > contentHeight - scrollView.frame.size.height * leadingScreensForBatching {
if !fetchingMore && !endReached {
beginBatchFetch()
}
}
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
func beginBatchFetch(){
fetchingMore = true
fetchPosts{ newPosts in
self.posts.append(contentsOf: newPosts)
self.endReached = newPosts.count == 0
self.fetchingMore = false
UIView.performWithoutAnimation {
self.tableView.reloadData()
self.listenForNewPosts()
}
}
//fetch the post
}
var postListenerHandle:UInt?
func listenForNewPosts(){
guard !fetchingMore else{ return}
//to avoid the listeners twice (duplicate)
stopListeningForNewPosts()
postListenerHandle = newPostQuery.observe(.childAdded) { (snapshot) in
if snapshot.key != self.posts.first?.id {
if let data = snapshot.value as? [String:Any],
//let post = Post.parse(snapshot.key,data)
let _ = Post.parse(snapshot.key,data){
self.stopListeningForNewPosts()
if snapshot.key == self.lastUploadPostID{
self.handleRefresh()
self.lastUploadPostID = nil
}else{
}
}
}
}
}
func stopListeningForNewPosts(){
if let handle = postListenerHandle{
newPostQuery.removeObserver(withHandle: handle)
postListenerHandle = nil
}
}
// func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
//if let navigationController = navigationController as? //ScrollingNavigationController {
// navigationController.showNavbar(animated: true, scrollToTop: true)
//}
// return true
//}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let newPostNavBar = segue.destination as? UINavigationController,
let newPostVC = newPostNavBar.viewControllers[0] as? WritePostViewController{
newPostVC.delegate = self
}
}
}
extension BlogViewController: NewPostVCDelegate{
func didUploadPost(withID id: String) {
print("what up this is the id \(id)")
self.lastUploadPostID = id
}
}

Answer 1

In the storyboard add inside the tableView as last element a transparent view with height equal to 1