我正在尝试使用Xcode 3和Swift开发一个笔记应用程序。这是我的代码：
@JsonProperty给我一个问题的一行是import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var table: UITableView!
var data: [String] = []
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Notes"
// Add a button (add or edit)
let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addNote))
self.navigationItem.rightBarButtonItem = addButton
self.navigationItem.leftBarButtonItem = editButtonItem
load()
}
// function that says what happens when button is pushed
func addNote() {
if table.isEditing {
return
}
let name: String = "Row \(data.count + 1)"
data.insert(name, at: 0)
let indexPath: IndexPath = IndexPath(row: 0, section: 0)
table.insertRows(at: [indexPath], with: .automatic)
self.performSegue(withIdentifier: "detail", sender: nil)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "cell")!
cell.textLabel?.text = data[indexPath.row]
return cell
}
// to set what happens when push edit button
override func setEditing(_ editing: Bool, animated: Bool) {
super.setEditing(editing, animated: animated)
table.setEditing(editing, animated: animated)
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
data.remove(at: indexPath.row)
table.deleteRows(at: [indexPath], with: .fade)
save()
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.performSegue(withIdentifier: "detail", sender: nil)
}
func save() {
UserDefaults.standard.set(data, forKey: "notes")
UserDefaults.standard.synchronize()
}
func load() {
if let loadedData = UserDefaults.standard.value(forKey: "notes") as? [String] {
data = loadedData
table.reloadData()
}
}
。该应用程序在模拟器上弹出，但没有内容，表格也没有显示。我错过了什么？