编辑模式下的 UITableViewCell 选择。

Posted 2023-02-26

【中文标题】编辑模式下的 UITableViewCell 选择。

【英文标题】：UITableViewCell selection in editing mode.

【发布时间】：2015-03-17 01:18:28

【问题描述】：

我正在制作一个自定义 UIViewController，我想在点击 UITableViewCell 时显示一条消息。我创建一个 UITableView 并设置属性

tableView.allowsSelectionDuringEditing = true

即使该属性已设置为 true，也不会调用 tableView(:didSelectRowAtIndexPath) 来显示消息。为什么会这样，我该如何解决？

这是我的 UITableViewController：

class GameListViewController: UIViewController, UITableViewDataSource, GameListViewDelegate, UITableViewDelegate

private var _games: [GameObject] = []

var tableView: UITableView return (view as GameListView).tableView
var gameListView: GameListView return (view as GameListView) 

override func loadView()

    view =  GameListView(frame: UIScreen.mainScreen().bounds)

    gameListView.delegate = self


override func viewDidLoad()

    super.viewDidLoad()

    tableView.dataSource = self


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

    return _games.count


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

    var index: Int = indexPath.row         
    let currentGame = _games[index]

    var cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: nil)
    cell.textLabel?.lineBreakMode = NSLineBreakMode.ByCharWrapping
    cell.textLabel?.numberOfLines = 2

    if currentGame.isFinished == true
    
        cell.imageView?.image = UIImage(named: "Finished.png")
        cell.textLabel?.text = "Winner: Player\(currentGame.playerMakingMove)\nMissiles Launched: \(currentGame.missileCount)"
    
    else
    
        cell.imageView?.image = UIImage(named: "Resume.png")
        cell.textLabel?.text = "Turn: Player\(currentGame.playerMakingMove)\nMissiles Launched: \(currentGame.missileCount)"
    
    return cell


/*Handles deleting the cells*/
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath)

    if (editingStyle == UITableViewCellEditingStyle.Delete)
    
        var index: Int = indexPath.row
        _games.removeAtIndex(index)
        tableView.deleteRowsAtIndexPaths(NSArray(array: [indexPath]), withRowAnimation: UITableViewRowAnimation.Left)
    
    tableView.reloadData()


/* Performs when a cell is touched */
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)

    var index: Int = indexPath.row
    tableView.selectRowAtIndexPath(indexPath, animated: true, scrollPosition: UITableViewScrollPosition.None)

    println("inside tableView: didSelectRowAtIndexPath")
    var message = UIAlertView(title: "Row selected", message: "You have selected a row", delegate: nil, cancelButtonTitle: "Click ME!", otherButtonTitles: "no other buttons")

    message.show()


func makeNewGame()

    addGames(1)
    tableView.reloadData()


func addGames(gameNumber: Int)

    var p1 = Player()
    var p2 = Player()

    for var i = 0; i < gameNumber; i++
    
        var randBool = Bool( round(drand48()))  // True/False
        var randPlayer:Int = Int( round( (drand48() + 1)) ) // 1 or 2
        var randMissleCount:Int = Int( arc4random_uniform(5000) + 1 )    //1 - 5001

        _games.append(GameObject(isFinished: randBool, playerMakingMove: randPlayer, missileCount: randMissleCount, player1: p1, player2: p2))
    

这是包含 UITableView 的 UIView：

protocol GameListViewDelegate: class

func makeNewGame()


class GameListView: UIView, PictureButtonDelegate

var newGameButton: PictureButton!
var tableView: UITableView!

weak var delegate: GameListViewDelegate? = nil

override init(frame: CGRect)

    super.init(frame: frame)

    newGameButton = PictureButton(frame: CGRect(), fileName: "NewGame.png")
    newGameButton.backgroundColor = UIColor.grayColor()
    newGameButton.delegate = self
    newGameButton.setTranslatesAutoresizingMaskIntoConstraints(false)


    tableView = UITableView()
    tableView.allowsSelectionDuringEditing = true
    tableView.setTranslatesAutoresizingMaskIntoConstraints(false)

    self.addSubview(newGameButton)
    self.addSubview(tableView)


override func layoutSubviews()

    let views: [String : UIView] = ["button": newGameButton, "tableView": tableView]

    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[button]-|", options: .allZeros, metrics: nil, views: views))

    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[tableView]-|", options: .allZeros, metrics: nil, views: views))

    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-(>=15,<=25)-[button]-[tableView]-|", options: .allZeros, metrics: nil, views: views))


func buttonPushed()

    delegate?.makeNewGame()


required init(coder aDecoder: NSCoder) 
    fatalError("init(coder:) has not been implemented")

【问题讨论】：

只显示必要的代码。

【参考方案1】：

您必须为UITableView 设置一个委托并实现func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)。

您只设置数据源，但从不设置委托（GameListView 仅设置一个 GameListViewDelegate）。

将GameListViewController 中的viewDidLoad 函数更改为：

override func viewDidLoad()

    super.viewDidLoad()

    tableView.dataSource = self
    tableView.delegate = self