Ios 为什么在单击阵列中的按钮时应用程序会崩溃？

我有一个带有歌曲标题的数组，我正在给每个单元格添加一个带有标题的播放按钮，但是当我单击播放按钮时，它崩溃了，我将数组从索引错误中取出。为什么会发生这种错误？我怎么修理它

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

    let cell = table.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) 

    cell.textLabel?.text = ret[indexPath.row]

    let playButton : UIButton = UIButton(type: UIButtonType.Custom)
    playButton.tag = indexPath.row
    let imageret = "playbutton"
    playButton.setImage(UIImage(named: imageret), forState: .Normal)
    playButton.frame = CGRectMake(230, 20, 100, 100)
    playButton.addTarget(self,action: "playit:", forControlEvents: UIControlEvents.TouchUpInside)

    for view: UIView in cell.contentView.subviews {
        view.removeFromSuperview()
    }


    cell.contentView.addSubview(playButton)

    return cell
}

下面是根据单击播放按钮播放歌曲的代码

 func playit(sender: UIButton!){

    let cell = table.dequeueReusableCellWithIdentifier("cell") 

    let playButtonrow = sender.tag

    print(titleatcell[playButtonrow])



    if let nowPlaying = musicPlayer.nowPlayingItem{
    let title = nowPlaying[MPMediaItemPropertyTitle] as? String
    let artist = nowPlaying[MPMediaItemPropertyTitle] as? String



    print("now playing \(title!) \(artist!)")
    print("cell: \(playButtonrow) \(titleatcell[playButtonrow])")

        let query = PFQuery(className: "Songs")
        query.whereKey("SongName", equalTo: ret[playButtonrow])
        query.findObjectsInBackgroundWithBlock {
            (objects: [AnyObject]?, error: NSError?) -> Void in
            if error == nil {
                // The find succeeded.
                print("Successfully retrieved \(objects!.count) song(s).")
                // Do something with the found objects
                if let objects = objects as? [PFObject] {
                    for object in objects {
                        print(object.objectId)

                        print(playButtonrow)
                        let object = object as PFObject
                        let parseAudio = object.valueForKey("SongFile") as! PFFile
                        let audioPath: String = parseAudio.url!
                        let urlParse: NSURL = NSURL(string: audioPath)!


                        player = AVPlayer(URL: urlParse)
                        player.volume = 1.0
                        //let timeInterval: NSTimeInterval = 10.0
                        //let timesArray = [NSValue(CMTime: CMTimeMake(Int64(timeInterval), 1))]
                        timeObserver = player.addBoundaryTimeObserverForTimes([30.0], queue:nil) { () -> Void in
                            print("30s reached", terminator: "")
                            player.removeTimeObserver(timeObserver)
                            player.pause()
                        }
                        player.play()





                    }


                }

            } else {
                // Log details of the failure
                print("Error: \(error!) \(error!.userInfo)")
            }


        }

    }
}

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致命错误：数组索引超出范围

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尝试访问不存在的数组索引时会发生此错误。可能您没有解析数据，当您单击“开始”按钮时，xcode试图访问一个不存在的指针。。。。但是我们需要更多的信息来帮助您有效地

您能显示崩溃报告吗请发布完整的logcat输出，您会问为什么它会崩溃，而不提供日志输出，我们不是向导。看起来titleatcell阵列已经越界了，你可以删除titleatcell，因为你没有在你的查询中使用。我现在无法截屏，但崩溃控制台说的所有错误都是致命错误：数组索引超出范围这是在哪行代码上崩溃的？