Hello,
I'm having a little trouble with a simple list making app I'm developing. I have two lists- a parent list and a child list- and when the user taps on a button in a parent list tableViewCell, I want to pass some data to the child list to populate it. The parent list contains objects called "compartments", and each compartment contains an array of "items", which I'll use to populate the child list. I need to access the array of compartments in CompartmentTableViewController in order to get the array of child items stored in it. I'd really appreciate any help at all. Please feel free to ask for more details or more code. Thank you so much!
//
// CompartmentTableViewController.swift
// CompartmentsApp
//
// Created by James Kershner on 3/30/19.
// Copyright © 2019 James Kershner. All rights reserved.
//
import UIKit
import os.log
class CompartmentTableViewController: UITableViewController
{
// MARK: Properties
var compartments = [Compartment]()
var items = [Item]()
let date1 = Date()
let date2 = Date()
let date3 = Date()
// MARK: Private Methods
private func loadSampleCompartments()
{
// First populate a sample item list
guard let item1 = Item.init(name: "Do the dishes", date: date1, statusColor: UIColor.blue, colorList: [UIColor.blue, UIColor.green, UIColor.yellow]) else
{
fatalError("Unable to instantiate item1")
}
guard let item2 = Item.init(name: "Feed the dogs", date: date2, statusColor: UIColor.yellow, colorList: []) else
{
fatalError("Unable to instantiate item2")
}
guard let item3 = Item.init(name: "Finish economics paper", date: date3, statusColor: UIColor.purple, colorList: [UIColor.orange, UIColor.green]) else
{
fatalError("Unable to instantiate item3")
}
items += [item1, item2, item3]
// Now populate the sample Compartment list
guard let compartment1 = Compartment(compartmentName: "Shopping List", itemList: items, compartmentColor: UIColor.blue, colorIndex: 1) else
{
fatalError("Unable to instantiate Compartment 1")
}
guard let compartment2 = Compartment(compartmentName: "Student List", itemList: items, compartmentColor: UIColor.purple, colorIndex: 5) else
{
fatalError("Unable to instantiate Compartment 2")
}
guard let compartment3 = Compartment(compartmentName: "Work To-dos", itemList: items, compartmentColor: UIColor.orange, colorIndex: 4) else
{
fatalError("Unable to instantiate Compartment 3")
}
compartments += [compartment1, compartment2, compartment3]
}
private func saveCompartments()
{
let isSuccessfulSave = NSKeyedArchiver.archiveRootObject(compartments, toFile: Compartment.ArchiveURL.path)
if isSuccessfulSave
{
os_log("Compartments saved successfully.", log: OSLog.default, type: .debug)
}
else
{
os_log("Failed to save compartments...", log: OSLog.default, type: .debug)
}
}
private func loadCompartments() -> [Compartment]?
{
return NSKeyedUnarchiver.unarchiveObject(withFile: Compartment.ArchiveURL.path) as? [Compartment]
}
override func viewDidLoad()
{
super.viewDidLoad()
// use the edit button provided by the table view controller.
navigationItem.leftBarButtonItem = editButtonItem
// Now load the compartments
if let savedCompartments = loadCompartments()
{
compartments += savedCompartments
}
else
{
loadSampleCompartments()
}
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int
{
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return compartments.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cellIdentifier = "CompartmentTableViewCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? CompartmentTableViewCell else
{
fatalError("The dequeued cell is not an instance of MealTableViewCell.")
}
// Fetches the appropriate meal for the data source layout.
let compartment = compartments[indexPath.row]
// Configure the cell.
cell.compartmentName.text = compartment.compartmentName
cell.compartmentColor.backgroundColor = compartment.compartmentColor
return cell
}
// MARK: Actions
@IBAction func unwindToCompartmentsList(sender: UIStoryboardSegue)
{
if let sourceViewController = sender.source as? CompartmentEditViewController, let compartment = sourceViewController.compartment
{
if let selectedIndexPath = tableView.indexPathForSelectedRow
{
// Update an existing compartment
compartments[selectedIndexPath.row] = compartment
tableView.reloadRows(at: [selectedIndexPath], with: .none)
}
else
{
// Add a new compartment
let newIndexPath = IndexPath(row: compartments.count, section: 0)
compartments.append(compartment)
tableView.insertRows(at: [newIndexPath], with: .automatic)
}
saveCompartments()
}
}
/*
// 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 editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath)
{
if editingStyle == .delete
{
// Delete the row from the data source
compartments.remove(at: indexPath.row)
saveCompartments()
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert
{
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
/*
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
}
*/
/*
// 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 true
}
*/
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
super.prepare(for: segue, sender: sender)
switch(segue.identifier ?? "")
{
case "AddCompartment":
os_log("Adding a new compartment", log: OSLog.default, type: .debug)
case "showCompartmentDetail":
guard let compartmentDetailViewController = segue.destination as? CompartmentEditViewController else
{
fatalError("Unexpected destination: \(segue.destination)")
}
guard let selectedCompartmentCell = sender as? CompartmentTableViewCell else
{
fatalError("Unexpected sender: \(sender)")
}
guard let indexPath = tableView.indexPath(for: selectedCompartmentCell) else
{
fatalError("The selected cell is not being displayed by the table")
}
let selectedCompartment = compartments[indexPath.row]
compartmentDetailViewController.compartment = selectedCompartment
default:
fatalError("Unexpected Segue Identifier: \(segue.identifier)")
}
}
}
