How can I pass one just one part of a struct? - ios

Question

I'm trying to pass just the image part of a struct (containing also two textFields, and another imageView I'd like to not pass).
Here is the tableViewController
import UIKit
class SentMemesTableViewController: UITableViewController {
var _tableView: UITableView!
var memeData: [Meme] = []
//calling memes from array in Delegate
let appDelegate = UIApplication.shared.delegate as! AppDelegate
var memes: [Meme] {
return appDelegate.memes
}
override func viewWillAppear(_ animated: Bool) {
tableView.reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.isScrollEnabled = true
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "MemeDetailViewController" ,
let nextScene = segue.destination as? MemeDetailViewController ,
let indexPath = tableView.indexPathForSelectedRow {
let selectedMeme = memes[indexPath.row].memedImage
nextScene.sentMemeView.image = Meme.memedImage
}
}
// MARK: - Table view data source
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//navigationController!.pushViewController(MemeDetailViewController, animated: true)
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return memes.count
}
// Here it is! -----
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let tableViewCell = tableView.dequeueReusableCell(withIdentifier: "sentMemesTableView") as! MemeTableViewCell
let meme = memes[indexPath.row]
tableViewCell.tableViewImage.image = meme.memedImage
tableViewCell.tableViewLabel.text = "\(meme.topText)...\(meme.bottomText)"
return tableViewCell
}
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return false
}
func deleteMemesInTableViewCell(_ index: Int) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.memes.remove(at: index)
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == UITableViewCellEditingStyle.delete) {
tableView.beginUpdates()
deleteMemesInTableViewCell(indexPath.row)
tableView.deleteRows(at: [indexPath], with: UITableViewRowAnimation.left)
tableView.endUpdates()
}
}
}
Here is the Meme and SentMemeView structs.
import Foundation
import UIKit
struct Meme {
let topText: String
let bottomText: String
let originalImage: UIImage
let memedImage: UIImage
}
struct SentMemeImageView {
var memedImageDetailVC: UIImageView
}
I can't find a way to call it successfully.
Here is the MemeDetailViewController. I need just for the sentMemeView to display the SentMemeImageView.
class MemeDetailViewController: UIViewController {
var meme = SentMemeImageView?.self
#IBOutlet weak var sentMemesBtn: UIBarButtonItem!
#IBOutlet weak var editBtn: UIBarButtonItem!
#IBOutlet weak var sentMemeView: UIImageView!
func displayMeme(_ meme: SentMemeImageView) {
}
#IBAction func launchMemeEditorViewController(_ sender: Any) {
_ = navigationController?.popViewController(animated: true)
}
//unwinding to the view before (the collectionView, or the tableView)
#IBAction func unwindVC(for unwindSegue: UIStoryboardSegue, towardsViewController subsequentVC: UIViewController) {
self.dismiss(animated: true, completion: nil)
}
}

Answer 1

First of all, sad to say that, your code is quite messed up:
You have with three different kinds of data sources, some are ignored, some you work with, but not in a consistent way:
data from the app delegate (deletion of data)
memeData property (display of data)
memes property (ignored)
You should really focus on where the data is stored and how to access it.
Secondly, you won't send views from one view controller to the other, but data. So rather use UIImage than UIImageView. So you'll hand in a SentMemeImage to the details controller.
I tried to clean up the code a little, but just to answer your explicit question. Please refactor it!
struct Meme {
let topText: String
let bottomText: String
let originalImage: UIImage
let memedImage: UIImage
}
struct SentMemeImage {
var memedImage: UIImage
}
class SentMemesTableViewController: UITableViewController {
var memeData: [Meme] = []
// ----8<---- snipp ----8<----
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "MemeDetailViewController" ,
let nextScene = segue.destination as? MemeDetailViewController ,
let indexPath = tableView.indexPathForSelectedRow {
let selectedMeme = memeData[indexPath.row]
let sentMemeImage = SentMemeImage(memedImage: selectedMeme.memedImage)
nextScene.meme = sentMemeImage
}
}
// ----8<---- snipp ----8<----
}
class MemeDetailViewController: UIViewController {
var meme:SentMemeImage?
#IBOutlet weak var sentMemesBtn: UIBarButtonItem!
#IBOutlet weak var editBtn: UIBarButtonItem!
#IBOutlet weak var sentMemeView: UIImageView!
func displayMeme() {
self.sentMemeView.image = self.meme?.memedImage
}
}