Swift TableView ImageView + Label = Fatal Error: Index out of range - ios

Question

I am using a tableview to show a Project's title including the image.
I'm using FirebaseStorage and FirebaseDatabase.
The Problem is, that when I have only one protect, I get "Fatal error: Index out of range", as soon as I click on the Title.
When I have more than one Project you can see what happens in the video.
Maybe someone can help me, since something isn't right with the index handling. :)
import UIKit
import Kingfisher
import Foundation
import FirebaseStorage
import FirebaseDatabase
class HomeViewController: UIViewController {
// MARK: - Properties
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var addProject: UIButton!
var posts = [Post]()
var textToBeSent: String = ""
override func viewDidLoad() {
super.viewDidLoad()
UserService.posts(for: User.current) { (posts) in
self.posts = posts
self.tableView.reloadData()
}
Utilities.addShadowtoButton(addProject)
}
func configureTableView() {
// remove separators for empty cells
tableView.tableFooterView = UIView()
// remove separators from cells
tableView.separatorStyle = .none
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toDetails" {
let destVC = segue.destination as! ShowProjectDetailsViewController
destVC.post = sender as? Post
}
}
}
extension Collection where Indices.Iterator.Element == Index {
public subscript(safe index: Index) -> Iterator.Element? {
return (startIndex <= index && index < endIndex) ? self[index] : nil
}
}
// MARK: - UITableViewDataSource
extension HomeViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let post = posts[indexPath.row]
performSegue(withIdentifier: "toDetails", sender: post)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 2
}
func numberOfSections(in tableView: UITableView) -> Int {
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let post = posts[indexPath.section]
switch indexPath.row {
case 0:
let cell = tableView.dequeueReusableCell(withIdentifier: "PostImageCell") as! PostImageCell
let imageURL = URL(string: post.imageURL)
cell.postImageView.kf.setImage(with: imageURL)
return cell
case 1:
let cell = tableView.dequeueReusableCell(withIdentifier: "PostSubCell") as! PostSubCell
cell.projectName.text = post.projectTitle
return cell
default:
fatalError("Error: unexpected indexPath.")
}
}
}
// MARK: - UITableViewDelegate
extension HomeViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
switch indexPath.row {
case 0:
let post = posts[indexPath.section]
return post.imageHeight
case 1:
return PostSubCell.height
default:
fatalError()
}
}
}
import Foundation
import FirebaseAuth.FIRUser
import FirebaseDatabase
import FirebaseUI
import FirebaseAuth
struct UserService {
static func posts(for user: User, completion: #escaping ([Post]) -> Void) {
let ref = Database.database().reference().child("posts").child(user.uid)
ref.observe(DataEventType.value, with: { (snapshot) in
guard let snapshot = snapshot.children.allObjects as? [DataSnapshot] else {
return completion([])
}
let posts = snapshot.reversed().compactMap(Post.init)
completion(posts)
})
}
}
import Foundation
import UIKit
import FirebaseDatabase.FIRDataSnapshot
class Post {
// Next let's add properties to store all the additional information we need. Add the following to your post class.
var key: String?
let imageURL: String
let imageHeight: CGFloat
let creationDate: Date
let imageName: String
let projectTitle: String
let projectLocation: String
let projectDescription: String
let projectBeginn: String
let projectEnd: String
// You'll get some compiler errors for not having any initializers or default values for certain properties. Let's go ahead and fix that:
init(imageURL: String, imageName: String, imageHeight: CGFloat, projectTitle: String, projectLocation: String, projectDescription: String, projectBeginn: String, projectEnd: String) {
self.imageURL = imageURL
self.imageName = imageName
self.imageHeight = imageHeight
self.creationDate = Date()
self.projectTitle = projectTitle
self.projectLocation = projectLocation
self.projectDescription = projectDescription
self.projectBeginn = projectBeginn
self.projectEnd = projectEnd
}
var dictValue: [String : Any] {
let createdAgo = creationDate.timeIntervalSince1970
return ["image_url" : imageURL,
"image_name" : imageName,
"image_height" : imageHeight,
"created_at" : createdAgo,
"projectTitle" : projectTitle,
"projectLocation" : projectLocation,
"projectDescription" : projectDescription,
"projectBeginn" : projectBeginn,
"projectEnd": projectEnd ]
}
init?(snapshot: DataSnapshot) {
guard let dict = snapshot.value as? [String : Any],
let imageURL = dict["image_url"] as? String,
let imageName = dict["image_name"] as? String,
let imageHeight = dict["image_height"] as? CGFloat,
let createdAgo = dict["created_at"] as? TimeInterval,
let projectTitle = dict["projectTitle"] as? String,
let projectLocation = dict["projectLocation"] as? String,
let projectDescription = dict["projectDescription"] as? String,
let projectBeginn = dict["projectBeginn"] as? String,
let projectEnd = dict["projectEnd"] as? String
else { return nil }
self.key = snapshot.key
self.imageURL = imageURL
self.imageName = imageName
self.imageHeight = imageHeight
self.creationDate = Date(timeIntervalSince1970: createdAgo)
self.projectTitle = projectTitle
self.projectLocation = projectLocation
self.projectDescription = projectDescription
self.projectBeginn = projectBeginn
self.projectEnd = projectEnd
}
}
Thanks for your help!

Answer 1

You created your numberOfSection by [Post]. And also you assigning performSegue on click of indexPath.row. So it's throws an error, you've to use indexPath.section instead of indexPath.row in didSelectItem() method
e.g.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
{
let post = posts[indexPath.section] // Use here section instead of row
performSegue(withIdentifier: "toDetails", sender: post)
}