Question

我有UITableView标签和一个显示音频列表的按钮。

按钮标有＆＃34; Play＆＃34;按下它变为＆＃34;停止＆＃34;播放音频，如果在其他单元格中按下另一个按钮，则上一个单元格按钮应该将其标签更改为＆＃34;播放＆＃34;。

现在，我在这里遇到的问题是如何将之前的单元格按钮更改回＆＃34; play＆＃34;吗

标签是UITableViewCell中的出口，UIButton以编程方式添加cellForRowAtIndexPath

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

    let cell = tableView.dequeueReusableCellWithIdentifier("SongTitleCell", forIndexPath: indexPath) as SongsTableViewCell

    let songDic : NSDictionary = arrSongs.objectAtIndex(indexPath.row) as NSDictionary

    cell.lblSongTitle.text = songDic.objectForKey("SongTitle") as? String


    btnPlayPause = UIButton(frame : CGRectMake(13,2,40,40))
    btnPlayPause.tag = indexPath.row
    btnPlayPause.setTitle("Play", forState: UIControlState.Normal)
    btnPlayPause.addTarget(self, action: "cellSongClicked:", forControlEvents: UIControlEvents.TouchUpInside)

    cell.contentView.addSubview(btnPlayPause)

    return cell
}

按钮的动作在这里：

func cellSongClicked (sender : AnyObject ){
    var remote = GetSongData()
    remote.delegate = self

    var btnCurrentPressed = sender as UIButton

    //Play Selected Song
    let songDic : NSDictionary = arrSongs.objectAtIndex(btnCurrentPressed.tag) as NSDictionary

    if (btnCurrentPressed.currentTitle == "Play") {

      remote.PlaySelectedSong(songDic.objectForKey("SongURL") as String!)
      btnCurrentPressed.setTitle("Stop", forState: UIControlState.Normal)

    } else {
      playerContoller.stop()
      btnCurrentPressed.setTitle("Play", forState: UIControlState.Normal)
    }

}

由于

Answer 1

我会使用这个策略：

1）保存包含您班级属性中当前播放歌曲的单元格的索引路径（您知道＆＃34; cellSongClicked＆＃34;操作中的UIButton标签中的新indexPath）

2）＆＃34; cellForRowAtIndexPath＆＃34;将按钮的标题设置为＆＃34; Play＆＃34;或＆＃34;停止＆＃34;取决于这是当前播放歌曲的单元格

3）当按下一个按钮时，刷新当前正在播放的歌曲单元格和新的播放歌曲单元格并调用它们＃34; reloadRowsAtIndexPaths＆＃34;

希望这有帮助

编辑代码详情：

1）每次按钮都不要重新分配。它必须是SongsTableViewCell类的另一个出口（与标签相同）。并从Interface Builder中设置目标/操作（在＃34; func cellSongClicked＆＃34;和ctrl-drag from IB）前添加@IBAction

2）将以下属性添加到您的类中：

private var currentSong : Int?

3）方法cellForRowAtIndexPath：

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

    let cell = tableView.dequeueReusableCellWithIdentifier("SongTitleCell", forIndexPath: indexPath) as SongsTableViewCell

    let songDic : NSDictionary = arrSongs.objectAtIndex(indexPath.row) as NSDictionary

    cell.lblSongTitle.text = songDic.objectForKey("SongTitle") as? String
    cell.btnPlayPause.tag = indexPath.row

    var title : String
    if let _currentSong = currentSong {
        title = indexPath.row == _currentSong ? "Stop" : "Play"
    } else {
        title = "Play"
    }
    cell.btnPlayPause.setTitle(title, forState: UIControlState.Normal)

    return cell
}

4）行动：

@IBAction func cellSongClicked (sender : AnyObject ){
    var remote = GetSongData()
    remote.delegate = self

    var btnCurrentPressed = sender as UIButton

    //Play Selected Song
    let songDic : NSDictionary = arrSongs.objectAtIndex(btnCurrentPressed.tag) as NSDictionary

    var rowsToReload = [NSIndexPath]()
    var stopCurrent = false
    if let _currentSong = currentSong {
        if btnCurrentPressed.tag == _currentSong {
            stopCurrent = true
        } else {
            rowsToReload.append(NSIndexPath(forRow: _currentSong, inSection:0))
        }
    }
    rowsToReload.append(NSIndexPath(forRow: btnCurrentPressed.tag, inSection:0))
    currentSong = stopCurrent ? nil : btnCurrentPressed.tag
    self.tableView.reloadRowsAtIndexPaths(rowsToReload, withRowAnimation: .None)
}

编辑：为当前歌曲添加了停止

检查用户是否正在点击当前播放按钮（if btnCurrentPressed.tag == _currentSong）。在这种情况下，不要重新加载该行（否则你将重新加载它两次）并将currentSong属性设置为nil（使用temp boolean stopCurrent）。

如何在UITableViewCell中更改以前按下的UIButton标签？

1 个答案: