How to use segue in navigation SWIFT Xcode? - ios

Question

I'm building a simple dictionary app. I've gotten it to display words on UItableView while user is searching or not. I'm working on assigning each individual word with its own definition but I'm facing a trouble while setting the destination for each word at words array.
Here is part of my ViewController class and its contents:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var tableView: UITableView!
var wordSearch = [String]()
var wordArray: [String] = []
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let url = Bundle.main.url(forResource: "zo_words", withExtension: "txt")! // file URL for file "words_alpha.txt"
do {
let string = try String(contentsOf: url, encoding: .utf8)
wordArray = string.components(separatedBy: "\n")
} catch {
print(error)
}
}
}
extension ViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching {
return wordSearch.count
} else {
return wordArray.count
}
Here is my wordSearch function:
extension ViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
wordSearch = wordArray.filter({$0.lowercased().prefix(searchText.count) == searchText.lowercased();})
searching = true
tableView.reloadData()
}
Cannot assign value of type 'String' to type 'ViewController' Error is raised in below function while building
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? DefinitionViewController {
destination.word = wordArray[(tableView.indexPathForSelectedRow?.row)!]
class DefinitionViewController:
import UIKit
class DefinitionViewController: UIViewController {
#IBOutlet weak var lbDefinition:
UILabel!
var word: ViewController?
override func viewDidLoad() {
super.viewDidLoad()
lbDefinition.text = "\((word?.wordSearch)!)"
}
}

Answer 1

I think it's not applicable and recommended to take an instance from the ViewController but you can do it so easy by using the below:
Let's say you've word in your viewControllerthen you have to do the below:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard tableView.indexPathForSelectedRow != nil else {
return
}
let selectedWord = wordArray[tableView.indexPathForSelectedRow!.row]
let destination = segue.destination as! DefinitionViewController
destination.word = selectedWord
}
DefinitionViewController:
import UIKit
class DefinitionViewController: UIViewController {
#IBOutlet weak var lbDefinition:
UILabel!
var word: String?
override func viewDidLoad() {
super.viewDidLoad()
guard word != nil else {return}
lbDefinition.text = "\((word?.wordSearch)!)"
}
}

Answer 2

class ViewController: UIViewController {
static var wordSearch = [string]()
}
class DefinitionViewController: UIViewController {
#IBOutlet weak var lbDefinition:UILabel!
override func viewDidLoad() {
super.viewDidLoad()
lbDefinition.text = "\(ViewController.wordSearch)"
}
}