雨燕3.0：存储阵列中UserDefaults为的tableView

Question

我试图存储在UserDefaults数组又不得不找到解决办法没有运气。我有一个struct和func设置这个工作来存储“名称”和“描述”在一个数组中。代码如下...

struct task { 
    var name = "Untitled" 
    var description = "No description available" 
} 

var tasks = [task]() 

func addTask(name: String, description: String) { 
    tasks.append(task(name: name, description: description)) 
} 

什么是存储在UserDefaults的数据，并重新开张后，将信息添加cell.textLabel?.text和cell.detailTextLabel?.text的最佳方式？

Answer 1

这是斯威夫特惯例命名您的结构开始以一个大写字母。你需要做的一类，使之符合NSCoding和使用KeyedArchiever保存对象数据

class Task: NSObject, NSCoding { 
    let name: String 
    let desc: String 
    required init(name: String, desc: String) { 
     self.name = name 
     self.desc = desc 
    } 
    func encode(with coder: NSCoder) { 
     coder.encode(name, forKey: "name") 
     coder.encode(desc, forKey: "desc") 
    } 
    required init(coder decoder: NSCoder) { 
     self.name = decoder.decodeObject(forKey: "name") as? String ?? "" 
     self.desc = decoder.decodeObject(forKey: "desc") as? String ?? "" 
    } 
} 

---

测试

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { 
    @IBOutlet weak var nameField: UITextField! 
    @IBOutlet weak var descField: UITextField! 
    @IBOutlet weak var tableView: UITableView! 
    var tasks: [Task] = [] 
    override func viewDidLoad() { 
     super.viewDidLoad() 
     tableView.delegate = self 
     tableView.dataSource = self 
     if let data = UserDefaults.standard.data(forKey: "tasks") { 
      tasks = NSKeyedUnarchiver.unarchiveObject(with: data) as? [Task] ?? [] 
      tableView.reloadData() 
     } 
    } 
    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
    } 
    @IBAction func addTask(_ sender: UIButton) { 
     guard let name = nameField.text, let desc = descField.text else { return } 
     tasks.append(Task(name: name, desc: desc)) 
     UserDefaults.standard.set(NSKeyedArchiver.archivedData(withRootObject: tasks) , forKey: "tasks") 
     tableView.reloadData() 
    } 
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return tasks.count 
    } 
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCell(withIdentifier: "cellID")! 
     cell.textLabel?.text = tasks[indexPath.row].name + " - " + tasks[indexPath.row].desc 
     return cell 
    } 
}