如何更新tableview中的数据（Swift） [英] how to update data in tableview (Swift)

问题描述

我有两个Swift文件：NotificationsViewController和ViewController。
点击按钮时，在ViewContoller中更新firstArray。我能够打印更新的数据。但是，当我切换回NotificationsViewController时，当我拉到刷新时，tableview没有更新。

I have two Swift files: NotificationsViewController and ViewController. The firstArray is updated in the ViewContoller when a button is tapped. I was able to print the updated data. However, when I switch back to NotificationsViewController the tableview is not updated when I pull to refresh.

NotificationsViewController：

NotificationsViewController:

import Foundation
import UIKit

var  firstArray : [String] = ["123","1234"]

class NotificationsViewController: UITableViewController {


    var refresher: UIRefreshControl!

    var data: [[String]] = [firstArray, ["4","5"]]

    func refresh(){

        print("refreshed")
        self.tableView.reloadData()
        self.refresher.endRefreshing()

    }

    override func viewDidLoad() {


        refresher = UIRefreshControl()
        refresher.attributedTitle = NSAttributedString(string: "pull to refresh")

        refresher.addTarget(self, action: #selector(NotificationsViewController.refresh), forControlEvents: UIControlEvents.ValueChanged)
        self.tableView.addSubview(refresher)
        refresh()


        super.viewDidLoad()
        self.tableView.editing = true

    }

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
      return data.count

    }
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {



        return data[section].count

    }


    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell: UITableViewCell = UITableViewCell(style: .Subtitle, reuseIdentifier: "tableCell")

        cell.textLabel?.text = data[indexPath.section][indexPath.row]

        return cell
    }

    override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
        if editingStyle == .Delete {

            data[indexPath.section].removeAtIndex(indexPath.row)
            tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)



        }
    }

}

ViewController：

ViewController:

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func button(sender: AnyObject) {
              firstArray.append("522")
              print(firstArray)

    }


}

我试过这个但它也没有用。

更新：

如何更新基于另一个数组的cell.detailTextLabel？.text的值？

How can I update a value of cell.detailTextLabel?.text that is based on another array?

提前谢谢

推荐答案

一个问题：

更新后第一个数组。您还需要更新数据。它不会自动更新。所以你的代码看起来像

After you update the first array. You need to update the data too. It doesn't get updated automatically. so your code could look like

func refresh(){
    data = [firstArray, ["4","5"]]
    print("refreshed")
    self.tableView.reloadData()
    self.refresher.endRefreshing()
}

反馈：

不使用类外的变量，更好用单身人士班。它看起来像这样：

Instead of using a variable outside of classes, its better to use a singleton class. It looks like this:

class Singleton: NSObject {
    static let sharedInstance = Singleton()
    var firstArray = []
}

您可以像

Singleton.sharedInstance.firstArray

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