How to change button title from table static cells? - ios

Question

I have HomeViewController that's segued modally to a Navigation Controller with an identifier of: pickSubjectAction
And on SubjectPickerTableViewController is where my subjects to choose. This is my code
import UIKit
class SubjectPickerTableViewController: UITableViewController {
var subjects:[String] = [
"English",
"Math",
"Science",
"Geology",
"Physics",
"History"]
var selectedSubject:String? {
didSet {
if let subject = selectedSubject {
selectedSubjectIndex = subjects.index(of: subject)!
}
}
}
var selectedSubjectIndex:Int?
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return subjects.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "SubCell", for: indexPath)
cell.textLabel?.text = subjects[indexPath.row]
if indexPath.row == selectedSubjectIndex {
cell.accessoryType = .checkmark
} else {
cell.accessoryType = .none
}
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
//Other row is selected - need to deselect it
if let index = selectedSubjectIndex {
let cell = tableView.cellForRow(at: IndexPath(row: index, section: 0))
cell?.accessoryType = .none
}
selectedSubject = subjects[indexPath.row]
//update the checkmark for the current row
let cell = tableView.cellForRow(at: indexPath)
cell?.accessoryType = .checkmark
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "saveSelectedSubject" {
if let cell = sender as? UITableViewCell {
let indexPath = tableView.indexPath(for: cell)
if let index = indexPath?.row {
selectedSubject = subjects[index]
}
}
}
}
}
This is segued also with identifier: savedSelectedSubject.
Q1: How can i segued from button to the tableview controller?
I tried this but failed
Q2: How to changed the button titled from selected Subject?
my resources: https://www.raywenderlich.com/113394/storyboards-tutorial-in-ios-9-part-2
Any help is appreciated. Thanks

Answer 1

How can i segued from button to the tableview controller? I tried
this but failed
performSegueWithIdentifier expects a String format while you are sending it in Any format. Correct way for call this function is
self.performSegue(withIdentifier: "pickSubjectAction", sender: self)
How to changed the button titled from selected Subject?
I guess you want to reflect the selected subject in the controller presented after savedSelectedSubject segue. Let ViewController A be the one through which you are pushing/presenting and ViewController B be the one which is pushed/presented. Follow the following steps :
For this you need to fetch the destination controller (B) from prepare(for segue: UIStoryboardSegue, sender: Any?) function via segue.destination property.
Make a public variable in B in which you can set your selected subject.
Using that property you can show your selected subject title.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let B = segue.destination
// Assuming B's public var is named selectedSubject and is of String type
if let subject = self.selectedSubject {
B.selectedSubject = subject
}
}
In Controller B
override func viewWillAppear() {
super.viewWillAppear()
button.setTitle(self.selectedSubject, for: .normal)
}
// We already have the value of selectedSubject which we are using to set title for the button.