XCode Swift Timer在滚动时在tableview中重新加载

Question

当我想在uitableview单元格中使用计时器时遇到问题。 每次当我滚动到底部，然后再次向上重置计数器的原始值。

我知道问题是什么..当滚动回来时，单元格被重新加载。但我怎么能实现单元格不滚动上下滚动时，因此我可以保留原单元格重新加载。任何伪代码都会有所帮助。

我的代码看起来像这样。

FirstViewController.swift

override func viewDidLoad() { 
    super.viewDidLoad() 
    self.view.backgroundColor = UIColor(hexString: "#bde8fb") 
    parseXhr(offset,limit:limit) 
    self.timer = NSTimer(timeInterval: 1.0, target: self, selector: #selector(FirstViewController.fireCellsUpdate), userInfo: nil, repeats: true) 
    NSRunLoop.currentRunLoop().addTimer(self.timer, forMode: NSRunLoopCommonModes) 
    // Do any additional setup after loading the view, typically from a nib. 
} 





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


    // algemene cell gegevens 
    let cell = self.tv.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomCell 
    let separator = UIView(frame: CGRectMake(0, 0, cell.bounds.size.width, 20)) 
    separator.backgroundColor = UIColor(hexString: "#bde8fb") 
    cell.contentView.addSubview(separator) 
    cell.photo.setBottomBorder("#bde8fb") 
    cell.timeInterval = self.timercounter[indexPath.row] 
    // load the image 
    cell.photo.contentMode = UIViewContentMode.ScaleAspectFit 



    cell.photo.kf_setImageWithURL(NSURL(string:"\(Config.image_dir)\(imageUrlArray[indexPath.row])"),placeholderImage: UIImage(named: Config.lazyLoadImage)) 
    // set the product name 
    cell.veiling_title.text = productNameArray[indexPath.row] 
    cell.veiling_title.textAlignment = .Center 
    return cell 
} 



func fireCellsUpdate() { 
    let notification = NSNotification(name: "CustomCellUpdate", object: nil) 
    NSNotificationCenter.defaultCenter().postNotification(notification) 
} 

而且我CustomCell.swift看起来像这样

var timercounter = 0 
@IBOutlet var veiling_title: UITextView! 
@IBOutlet var photo: UIImageView! 
@IBOutlet var veilingSeconds: UILabel! 

var timeInterval: Int = 0 { 
    didSet { 
     self.veilingSeconds.text = "\(timeInterval)" 
    } 
} 



func updateUI() { 
    if self.timeInterval > 0 { 
     self.timeInterval -= 1 
    } 
} 




override func awakeFromNib() { 
    super.awakeFromNib() 
    // Initialization code 

    let notificationCenter = NSNotificationCenter.defaultCenter() 
    notificationCenter.addObserver(self, selector: #selector(CustomCell.updateUI), name: "CustomCellUpdate", object: nil) 
} 

deinit { 
    NSNotificationCenter.defaultCenter().removeObserver(self) 
} 




override func setSelected(selected: Bool, animated: Bool) { 
    super.setSelected(selected, animated: animated) 

    // Configure the view for the selected state 
} 

Answer 1

请尝试以下

在FirstViewController在cellForRowAtIndexPath前右结束return行SERT

cell.callback = { (interval) in 
    self.timercounter[indexPath.row] = interval 
} 

在CustomCell添加属性

var callback : ((Int) ->())? 

，改变timeInterval

var timeInterval: Int = 0 { 
    didSet { 
    self.veilingSeconds.text = "\(timeInterval)" 
    callback?(timeInterval) 
    } 
} 

回调的好处是，它可以捕获timercounter数组和索引更新值相应地，每当timeInterval更改时，路径。

Answer 2

好吧，我终于搞定了！

我的问题是，我不得不在tableview中创建多个定时器。每当我向上或向下滚动计时器都会产生奇怪的结果（如秒数不正确，如重叠标签和错误时间）。我在FirstViewControllers

1定时器来所有秒追加在tableview中创造的2倍，让说GlobalTimerArray

2.And另一个计时器正在运行什么每隔秒递减GlobalTimerArray

然后我我的cellForRowAtIndexPath做这样的事：

if !self.loadedCells.contains(indexPath.row) { 
     self.loadedCells.append(indexPath.row) 
     loadSeconds(cell, indexPath: indexPath) 
    } else { 

     cell.timeInterval = self.saveSeconds[indexPath.row] 
     print(secondsToHoursMinutesSeconds(self.saveSeconds[indexPath.row])) 

    } 

和我viewDidLoad中看起来是这样的：

override func viewDidLoad() { 

    self.view.backgroundColor = UIColor(hexString: "#bde8fb") 

    socket.connect() 
    self.timer = NSTimer(timeInterval: 1.0, target: self, selector: #selector(FirstViewController.fireCellsUpdate), userInfo: nil, repeats: true) 
    NSRunLoop.currentRunLoop().addTimer(self.timer, forMode: NSRunLoopCommonModes) 
    parseXhr(offset,limit:limit) 
    self.secTimer = NSTimer(timeInterval: 1.0, target: self, selector: #selector(FirstViewController.decSeconds), userInfo: nil, repeats: true) 
    NSRunLoop.currentRunLoop().addTimer(self.secTimer, forMode: NSRunLoopCommonModes) 
    super.viewDidLoad() 


    // Do any additional setup after loading the view, typically from a nib. 
} 




func decSeconds() 
{ 
     for index in 0..<self.saveSeconds.count { 
     self.saveSeconds[index] -= 1 
    } 
} 

我希望这可以帮助别人，对我来说是很难理解的，但也许是因为这是我的第一个应用程序是什么我写在斯威夫特:)