如何在UICollectionViewCell上使用实时定时器？

我在UICollectionView的单元格上实现了一个倒数计时器，我从web服务获得时间，但是它显示静态时间，当我回到UICollectionView时，根据剩余的Web服务时间减少了课程时间。如何在UICollectionViewCell上使用实时定时器？

但是我想在每次减少一秒钟时显示它，任何帮助表示赞赏。

我的代码：

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell 
{ 

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! ManageObjectCollectionViewCell 
    revealTime = getRevealtime[indexPath.section].objectAtIndex(indexPath.row) as! Int    
    minutes = revealTime/60   
    seconds = revealTime % 60 
    cell.HourLabel.text = "0" 
    cell.MinLabel.text = NSString(string: "\(minutes)") as String 
    cell.sec.text = NSString(string: "\(seconds)") as String 
}

来源

2016-06-08 Gursimran Singh

真不明白。你能用例子更好地解释吗？ – Shubhank

当需要更新时，您是否有'NSTimer'对象或其他计时器触发 - （从Web服务获取新时间或根据您已有的信息计算）。获取新时间后，您将重新加载指定索引处的单元格，或重新加载所有单元格（取决于您的需要）。 – DJohnson

let currentTime = NSDate.timeIntervalSinceReferenceDate() 

    //Find the difference between current time and start time. 
    var elapsedTime: NSTimeInterval = currentTime - startTime 

    //calculate the hours in elapsed time. 
    let hours = UInt8(elapsedTime/3600.0) 
    elapsedTime -= (NSTimeInterval(hours) * 3600) 


    //calculate the minutes in elapsed time. 
    let minutes = UInt8(elapsedTime/60.0) 
    elapsedTime -= (NSTimeInterval(minutes) * 60) 

    //calculate the seconds in elapsed time. 
    let seconds = UInt8(elapsedTime) 
    elapsedTime -= NSTimeInterval(seconds) 

    //find out the fraction of milliseconds to be displayed. 
    // let fraction = UInt8(elapsedTime * 100) 

    //add the leading zero for minutes, seconds and millseconds and store them as string constants 

    let strMinutes = String(format: "%02d", minutes) 
    let strSeconds = String(format: "%02d", seconds) 
    let hourss = String(format: "%02d", hours) 

    //concatenate minuets, seconds and milliseconds as assign it to the UILabel 
    lblDisplayTime.text = "\(hourss):\(strMinutes):\(strSeconds)"

使用此代码

来源

2016-06-08 08:39:31

如何在UICollectionViewCell上使用实时定时器？

回答

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