Hide cell from UITableView - swift

Question

I'm trying to hide cells from a UITableView. My codes are below.
When I open the app I see empty rows in my TableViewas you can see here
How can I hide or remove(not delete) empty cells from UITableView?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FeedTableViewCell
let row = self.items[indexPath.row]
cell.lblTitle.text = row.title
cell.isHidden = !checkCurrentUser(email: row.email)
return cell
}
I added filtered array but then I take different error like this. My new codes are below. How can I solve this problem?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FeedTableViewCell
let row = self.items[indexPath.row]
self.items = self.items.filter{checkCurrentUser(email: $0.email)}
cell.lblTitle.text = row.title
//cell.isHidden = !checkCurrentUser(email: row.email)
return cell
}
Whole codes are below
import UIKit
import Firebase
class OyuncularVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
var items = [ItemModel]()
#IBOutlet weak var tblView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tblView.tableFooterView = UITableViewHeaderFooterView()
retrieveItems()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FeedTableViewCell
let row = self.items[indexPath.row]
self.items = self.items.filter{checkCurrentUser(email: $0.email)} //bunu ekledim siliceksem bunu silicem aga
cell.lblTitle.text = row.title
//cell.isHidden = !checkCurrentUser(email: row.email)
return cell
}
/* Retriev Items */
func retrieveItems() {
DataService.dataService.ITEM_REF.observe(.value, with: { (snapshot: DataSnapshot?) in
if let snapshots = snapshot?.children.allObjects as? [DataSnapshot] {
self.items.removeAll()
print(snapshots.count)
for snap in snapshots {
if let postDic = snap.value as? Dictionary<String, AnyObject> {
let itemModel = ItemModel(key: snap.key, dictionary: postDic)
print(itemModel)
self.items.insert(itemModel, at: 0)
}
}
self.tblView.reloadData()
}
})
}
func checkCurrentUser(email: String) -> Bool {
let currentUser = Auth.auth().currentUser
return email == currentUser?.email
}
}
}

Answer 1

If you want to display only the emails of the current user what don't you filter the items in the database (applying a predicate) which is the most efficient way.
Or filter the items in the for snap in snapshots loop.
However if you want to keep the entire data set declare a second array
var items = [ItemModel]()
var filteredItems = [ItemModel]()
and replace
for snap in snapshots {
if let postDic = snap.value as? Dictionary<String, AnyObject> {
let itemModel = ItemModel(key: snap.key, dictionary: postDic)
print(itemModel)
self.items.insert(itemModel, at: 0)
}
}
with the following it performs the check in the loop
let currentUser = Auth.auth().currentUser
self.filteredItems.removeAll()
for snap in snapshots {
if let postDic = snap.value as? Dictionary<String, AnyObject> {
let itemModel = ItemModel(key: snap.key, dictionary: postDic)
print(itemModel)
self.items.insert(itemModel, at: 0)
if itemModel.email == currentUser?.email {
self.filteredItems.insert(itemModel, at: 0)
}
}
}
And replace also the two data source methods with
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filteredItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FeedTableViewCell
let row = self.filteredItems[indexPath.row]
cell.lblTitle.text = row.title
return cell
}
And delete the method checkCurrentUser