我目前正在尝试使用Swift进行持久数据实验，但我在保存和检索数据方面遇到了麻烦。基本上我有两个文本字段，当用户按提交按钮时，输入将保存到UITable中，在这里用户可以移动表中的条目或删除它们（如果他们想这么做）。我的主要问题是保存和加载这些数据。
Taskmanager.swift - 这里我存储了我的基本类型。
Taskmanager.swift - 这里我存储了我的基本类型。
import Foundation
import UIKit
var taskMgr: TaskManager = TaskManager()
struct task {
var name = "Name"
var year = "Year"
}
//setting data
let defaults = UserDefaults.standard
//defaults.synchronize()
//getting data
class TaskManager: NSObject {
var tasks = [task]()
func addTask(name: String, year: String){
tasks.append(task(name: name, year: year))
}
}
ThirdViewController.swift -- 这里我存储了我的表格及其功能，还有保存和加载数据函数的草图。
import Foundation
import UIKit
class ThirdViewController:UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var tableView: UITableView!
@IBAction func deleteT(_ sender: Any) {
if(tableView.isEditing == true){
tableView.setEditing(false, animated: true)
}else{
tableView.setEditing(true, animated: true)
}
}
func saveData() {
let data = NSMutableData()
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let path = paths[0]
let file = (path as NSString).appendingPathComponent("Persistent.plist")
//2
let archiver = NSKeyedArchiver(forWritingWith: data)
archiver.encode(G, forKey: "name")
archiver.endode(year, forKey: "year")
archiver.finishEncoding()
data.write(toFile: file, atomically: true)
}
func loadData() {
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let path = paths[0]
let file = (path as NSString).appendingPathComponent("Persistent.plist")
// 1
if FileManager.default.fileExists(atPath: file) {
if let data = NSData(contentsOfFile: file) {
let unarchiver = NSKeyedUnarchiver(forReadingWith: data as Data)
name = unarchiver.decodeObjectForKey("name") as! [String]
year = unarchiver.decodeObjectForKey("year") as! [String]
unarchiver.finishDecoding()
}
}
}
func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, shouldIndentWhileEditingRowAt indexPath: IndexPath) -> Bool {
return false
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.reloadData()
loadData()
}
override func viewWillAppear(_ animated: Bool) {
self.tableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return taskMgr.tasks.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.subtitle, reuseIdentifier: "TableView")
//Assign the contents of our var "items" to the textLabel of each cell
cell.textLabel!.text = taskMgr.tasks[indexPath.row].name
cell.detailTextLabel!.text = taskMgr.tasks[indexPath.row].year
//cell.editing = tableView(tableView, canMoveRowAtIndexPath: indexPath)
return cell
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath){
if (editingStyle == UITableViewCellEditingStyle.delete){
taskMgr.tasks.remove(at: indexPath.row)
tableView.reloadData()
}
}
}
FourthViewController.swift -- 在这里，我有我的文本框和按钮以及如何将我的条目添加到表格中。
import Foundation
import UIKit
class FourthViewController: UIViewController, UITextFieldDelegate{
@IBOutlet var addT: UITextField!
@IBOutlet var addY: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func confTask(_ sender:UIButton){
if (addT.text == ""){
}else{
//add record
let name: String = addT.text!
let Year: String = addY.text!
//taskMgr.addTask(name:name)
taskMgr.addTask(name:name, year:Year)
}
//dismiss keyboard and reset fields
self.view.endEditing(true)
addT.text = nil
addY.text = nil
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.view.endEditing(true)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool{
textField.resignFirstResponder()
return true
}
}