Initializing an instance of struct and getting unresolved identifier error - ios

Question

I want to initialize an instance of a struct called TaskList in my TableViewController, but I'm getting a "Use of unresolved identifier 'tasks'" error every place I used 'tasks'. It worked fine when I was declaring the var tasks within the class, but now that it's an initialization of a var declared in another .swift file, I'm getting that error. I'm just learning Swift so I suspect this has something to do with the architecture or messing up how to call an object from another file. Does anyone know what I need to do to fix it? Any help would be greatly appreciated! Thanks everybody!
Here's the UITableViewController code:
import UIKit
class LoLFirstTableViewController: UITableViewController {
//var tasks:[Task] = taskData
// Hashed out the above line (even though it worked) because replacing with
// the below line because trying to get instance of TaskList containing all
// properties instead of just the tasks as well as to allow multiple instances
// of TaskList
let exampleList = TaskList(buddy: exampleBuddy, phoneNumber: examplePhoneNumber, tasks: exampleTaskData)
override func viewDidLoad() {
super.viewDidLoad()
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = 60.0
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tasks.count
}
#IBAction func cancelToLoLFirstTableViewController(_ segue:UIStoryboardSegue) {
}
#IBAction func saveAddTask(_ segue:UIStoryboardSegue) {
if let AddTaskTableViewController = segue.source as? AddTaskTableViewController {
if let task = AddTaskTableViewController.task {
tasks.append(task)
let indexPath = IndexPath(row: tasks.count-1, section: 0)
tableView.insertRows(at: [indexPath], with: .automatic)
}
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TaskCell", for: indexPath) as! TaskCell
let task = tasks[indexPath.row]
cell.task = task
if cell.accessoryView == nil {
let cb = CheckButton()
cb.addTarget(self, action: #selector(buttonTapped(_:forEvent:)), for: .touchUpInside)
cell.accessoryView = cb
}
let cb = cell.accessoryView as! CheckButton
cb.check(tasks[indexPath.row].completed)
return cell
}
func buttonTapped(_ target:UIButton, forEvent event: UIEvent) {
guard let touch = event.allTouches?.first else { return }
let point = touch.location(in: self.tableView)
let indexPath = self.tableView.indexPathForRow(at: point)
var tappedItem = tasks[indexPath!.row] as Task
tappedItem.completed = !tappedItem.completed
tasks[indexPath!.row] = tappedItem
tableView.reloadRows(at: [indexPath!], with: UITableViewRowAnimation.none)
}
}
And here's the code for the TaskList struct, if that helps:
import UIKit
struct TaskList {
var buddy: String?
var phoneNumber: String?
var tasks: [Task]
init(buddy: String?, phoneNumber: String?, tasks: [Task]) {
self.buddy = buddy
self.phoneNumber = phoneNumber
self.tasks = tasks
}
}

Answer 1

In your struct the tasks array is not optional it means you have to pass an initialised tasks Array. Pass an initialised array or change your task array to optional as you have done with buddy and phoneNumber.
import UIKit
struct TaskList {
var buddy: String?
var phoneNumber: String?
// add a question mark to make your array of tasks optional
var tasks: [Task]?
init(buddy: String?, phoneNumber: String?, tasks: [Task]) {
self.buddy = buddy
self.phoneNumber = phoneNumber
self.tasks = tasks
}
}
Note: when you're using struct you can leave out the initialzer it will generate one automatically
import UIKit
struct TaskList {
var buddy: String?
var phoneNumber: String?
var tasks: [Task]?
}
now in your viewController initialise the your example list
// as your tasks array is optional now even if you pass in a nil it will not crash but it will not have a tasks array
let exampleList = TaskList(buddy: exampleBuddy, phoneNumber: examplePhoneNumber, tasks: exampleTaskData)
remember to unwrap your array before using it otherwise your app can crash again if tasks array is nil. use if let or guard
if let tasks = exampleList.tasks {
// now you can use your tasks array
}