Question

我有一个简单的tableView在我的应用程序中运行，带有重新排序tableViewCell函数。当我尝试重新排序cell.reordering works.but当我关闭应用程序并重新打开它时，单元格顺序恢复正常。我想知道如何保存swift.my中的新订单单元格如下简单的代码，没有什么特别的简单的tableview ....

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

  @IBOutlet var tableView: UITableView!


  var tableData: [String] = ["Argentina", "Brazil", "Australia","Austria", "Chile", "Denmark","Colombia", "Denmark", "Czech Republic","Egypt", "Ireland", "Germany","Hong Kong", "Netherlands", "Mexico","Poland", "Switzerland", "Panama","United Arab Emirates", "Belgium", "Armenia"]

  override func viewDidLoad() {
    super.viewDidLoad()


    self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")


    self.tableView.reloadData()

  }

  // Toggle editing mode on/off
  @IBAction func reorderItems(sender: AnyObject) {

    if(tableView.editing == true) {
        tableView.setEditing(false, animated: true)
    } else {
        tableView.setEditing(true, animated: true)
    }

  }

  // Set editing mode to show 3 bars on right hand side
  func tableView(tableView: UITableView, editingStyleForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCellEditingStyle {
    return UITableViewCellEditingStyle.None
  }


  func tableView(tableView: UITableView, canMoveRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
  }


  func tableView(tableView: UITableView, shouldIndentWhileEditingRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return false
  }

  func tableView(tableView: UITableView, moveRowAtIndexPath sourceIndexPath: NSIndexPath, toIndexPath destinationIndexPath: NSIndexPath) {

    var itemToMove = tableData[sourceIndexPath.row] 
    tableData.removeAtIndex(sourceIndexPath.row)
    tableData.insert(itemToMove, atIndex: destinationIndexPath.row)

    self.tableView.reloadData()

  }

  func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.tableData.count
  }

  func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell   {

    var cell: UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell

    cell.textLabel?.text = self.tableData[indexPath.row]

    return cell
  }

  func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
    println("Row \(indexPath.row) selected")
  }
}

感谢...

Answer 1

要保留自定义订单，您需要将数组保存为用户默认值虽然不建议将NSUserDefaults用于大型数据集，但请在此示例代码中使用它。

AppDelegate

在didFinishLaunchingWithOptions中添加3行以注册默认值。

let countries = ["Argentina", "Brazil", "Australia","Austria", "Chile", "Denmark","Colombia", "Denmark", "Czech Republic","Egypt", "Ireland", "Germany","Hong Kong", "Netherlands", "Mexico","Poland", "Switzerland", "Panama","United Arab Emirates", "Belgium", "Armenia"]
let defaultValues = ["countries" : countries]
NSUserDefaults.standardUserDefaults().registerDefaults(defaultValues)

<强>的ViewController

将tableData声明为空数组。
```
var tableData = [String]()
```

在viewWillAppear添加

let defaults = NSUserDefaults.standardUserDefaults()
tableData = defaults.objectForKey("countries") as! [String]
tableView.reloadData()

将方法reorderItems替换为

@IBAction func reorderItems(sender: AnyObject) {

  if tableView.editing == true {
     tableView.setEditing(false, animated: true)
     let defaults = NSUserDefaults.standardUserDefaults()
     defaults.setObject(tableData , forKey: "countries")
  } else {
     tableView.setEditing(true, animated: true)
  }
}

TableView在Swift中永久重新排序

1 个答案: