XCode Swift Timer在滾動時在tableview中重新加載

Question

當我想在uitableview單元格中使用計時器時遇到問題。 每次當我滾動到底部，然後再次向上重置計數器的原始值。

我知道問題是什麼..當滾動回來時，單元格被重新加載。但我怎麼能實現單元格不滾動上下滾動時，因此我可以保留原單元格重新加載。任何僞代碼都會有所幫助。

我的代碼看起來像這樣。

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看起來像這樣

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

請嘗試以下

在FirstViewController在cellForRowAtIndexPath前右結束return行SERT

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

在CustomCell添加屬性

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

，改變timeInterval

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

回調的好處是，它可以捕獲timercounter數組和索引更新值相應地，每當timeInterval更改時，路徑。

Answer 2

好吧，我終於搞定了！

我的問題是，我不得不在tableview中創建多個定時器。每當我向上或向下滾動計時器都會產生奇怪的結果（如秒數不正確，如重疊標籤和錯誤時間）。我在FirstViewControllers

1定時器來所有秒追加在tableview中創造的2倍，讓說GlobalTimerArray

2.And另一個計時器正在運行什麼每隔秒遞減GlobalTimerArray

然後我我的cellForRowAtIndexPath做這樣的事：

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中看起來是這樣的：

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 
    } 
} 

我希望這可以幫助別人，對我來說是很難理解的，但也許是因爲這是我的第一個應用程序是什麼我寫在斯威夫特:)