🍎 To Do List

🍏 機能の詳細

🍏 テクノロジーを活用

🍏 機能実装

    @IBAction func tabAddButton(_ sender: UIBarButtonItem) {
        let alert = UIAlertController(title: "MustDo", message: nil, preferredStyle: .alert)
        let registerButton = UIAlertAction(title: "등록", style: .default, handler: { [weak self] _ in
            guard let title = alert.textFields?[0].text else { return }
            let task = Task(title: title, done: false)
            self?.tasks.append(task)
            self?.mustDoTableView.reloadData()
        })
        let cancelButton = UIAlertAction(title: "취소", style: .cancel, handler: nil)
        alert.addAction(cancelButton)
        alert.addAction(registerButton)
        alert.addTextField(configurationHandler: { textField in
            textField.placeholder = "할 일을 입력해주세요."
        })
        self.present(alert, animated: true, completion: nil)
    }

extension ViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.tasks.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        let task = self.tasks[indexPath.row]
        cell.textLabel?.text = task.title
        if task.done {
            cell.accessoryType = .checkmark
        } else {
            cell.accessoryType = .none
        }
        return cell
    }
    
    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        self.tasks.remove(at: indexPath.row)
        self.mustDoTableView.deleteRows(at: [indexPath], with: .automatic)
        if self.tasks.isEmpty {
            self.tabDoneButton()
        }
    }
    
    func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        var tasks = self.tasks
        let task = tasks[sourceIndexPath.row]
        tasks.remove(at: sourceIndexPath.row)
        tasks.insert(task, at: destinationIndexPath.row)
        self.tasks = tasks
    }
}

extension ViewController: UITableViewDelegate {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        var task = self.tasks[indexPath.row]
        task.done = !task.done
        self.tasks[indexPath.row] = task
        self.mustDoTableView.reloadRows(at: [indexPath], with: .automatic)
    }
}

    func saveTasks() {
        let data = self.tasks.map {
            [
                "title": $0.title,
                "done": $0.done
            ]
        }
        let userDefaults = UserDefaults.standard
        userDefaults.set(data, forKey: "tasks")
    }
    
    func loadTasks() {
        let userDefaults = UserDefaults.standard
        guard let data = userDefaults.object(forKey: "tasks") as? [[String: Any]] else { return }
        // "tasks"에 대한 value가 Any?타입으로 반환되는데, 이 Any를 [[String: Any]] 로 타입캐스팅한 것.
        self.tasks = data.compactMap {
            guard let title = $0["title"] as? String else { return nil }
            guard let done = $0["done"] as? Bool else { return nil }
            return Task(title: title, done: done)
        }
    }

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