/
MealTableViewController.swift
262 lines (156 loc) · 7.18 KB
/
MealTableViewController.swift
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import UIKit
import os.log
class MealTableViewController: UITableViewController {
var meals = [Meal]()
override func viewDidLoad() {
super.viewDidLoad()
// Use the edit button item provided by the table view controller.
navigationItem.leftBarButtonItem = editButtonItem
// Load any saved meals, otherwise load sample data.
if let savedMeals = loadMeals() {
meals += savedMeals
}
else {
// Load the sample data.
loadSampleMeals()
}
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// returns the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// returns the number of rows
return meals.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Table view cells are reused and should be dequeued using a cell identifier.
let cellIdentifier = "MealTableViewCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? MealTableViewCell else {
fatalError("The dequeued cell is not an instance of MealTableViewCell.")
}
// Fetches the appropriate meal for the data source layout.
let meal = meals[indexPath.row]
cell.nameLabel.text = meal.name
cell.photoImageView.image = meal.photo
cell.ratingControl.rating = meal.rating
return cell
}
/*
// 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
meals.remove(at: indexPath.row)
saveMeals()
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
}
*/
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
switch(segue.identifier ?? "") {
case "AddItem":
os_log("Adding a new meal.", log: OSLog.default, type: .debug)
case "ShowDetail":
guard let mealDetailViewController = segue.destination as? MealViewController else {
fatalError("Unexpected destination: \(segue.destination)")
}
guard let selectedMealCell = sender as? MealTableViewCell else {
fatalError("Unexpected sender: \(String(describing: sender))")
}
guard let indexPath = tableView.indexPath(for: selectedMealCell) else {
fatalError("The selected cell is not being displayed by the table")
}
let selectedMeal = meals[indexPath.row]
mealDetailViewController.meal = selectedMeal
default:
fatalError("Unexpected Segue Identifier; \(String(describing: segue.identifier))")
}
}
//MARK: Actions
@IBAction func unwindToMealList(sender: UIStoryboardSegue) {
if let sourceViewController = sender.source as? MealViewController, let meal = sourceViewController.meal {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
// Update an existing meal.
meals[selectedIndexPath.row] = meal
tableView.reloadRows(at: [selectedIndexPath], with: .none)
}
else {
// Add a new meal.
let newIndexPath = IndexPath(row: meals.count, section: 0)
meals.append(meal)
tableView.insertRows(at: [newIndexPath], with: .automatic)
}
// Save the meals.
saveMeals()
}
}
//MARK: Private
private func loadSampleMeals() {
let photo1 = UIImage(named: "blackforest")
let photo2 = UIImage(named: "chocotrufle")
let photo3 = UIImage(named: "winter")
guard let meal1 = Meal(name: "blackforest", photo: photo1, rating: 4) else {
fatalError("Unable to instantiate meal1")
}
guard let meal2 = Meal(name: "chocotrufle", photo: photo2, rating: 5) else {
fatalError("Unable to instantiate meal2")
}
guard let meal3 = Meal(name: "winter", photo: photo3, rating: 3) else {
fatalError("Unable to instantiate meal2")
}
meals += [meal1, meal2, meal3]
}
//MARK: Private Methods
//MARK: Private Methods
private func saveMeals() {
let fullPath = getDocumentsDirectory().appendingPathComponent("meals")
do {
let data = try NSKeyedArchiver.archivedData(withRootObject: meals, requiringSecureCoding: false)
try data.write(to: fullPath)
os_log("Meals successfully saved.", log: OSLog.default, type: .debug)
} catch {
os_log("Failed to save meals...", log: OSLog.default, type: .error)
}
}
func getDocumentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
return paths[0]
}
private func loadMeals() -> [Meal]? {
let fullPath = getDocumentsDirectory().appendingPathComponent("meals")
if let nsData = NSData(contentsOf: fullPath) {
do {
let data = Data(referencing:nsData)
if let loadedMeals = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as? Array<Meal> {
return loadedMeals
}
} catch {
print("Couldn't read file.")
return nil
}
}
return nil
}
}