如何获取collectionviewcell的选定indexpath.row的数量作为slideshare

Question

我想以“ 10/53”下方的幻灯片共享应用的形式在集合视图中获取所选单元格的数量

我厌倦了很多错误的方法，例如：“（print [indexpath.row] .count”）或print“ cell [indexpath.row] .count”

     func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! CollectionViewCell


    // Configure the cell
    if indexPath.row == 0 {
     cell.txxt.text = "Biz memorabilia: 1st day in business, a cold & cloudy day in 1955, @McDonalds did $366.12 in revenue on 2 registers.Biz memorabilia: 1st day in business, a cold & cloudy day in 1955, @McDonalds did $366.12 in revenue on 2 registers."

    }
    if indexPath.row == 1 {
        cell.txxt.text = "SmartHalo: Turn any bike into a smart bike http://www.producthunt.com/tech/smarthalo  via @gozmike on @producthunt"

    }
    if indexPath.row == 2 {
        cell.txxt.text = "Traditionally, policymakers & nonprofits try to improve financial health by measuring & teaching financial literacy"

    }

    //slideNumber is uilabel in the collectionViewCell
    cell.slideNumber.text = "(print[indexpath.row])"

    return cell
}

Answer 1

对于53中的10，使用visibleCells获取当前可见值：

   func scrollViewDidScroll(scrollView: UIScrollView!) {

        for cell in collectionView.visibleCells() as [CollectionViewCell] {
            var indexPath : NSIndexPath = collectionView.indexPathForCell(cell as CollectionViewCell)!
            // do something
            // display 10 of 53 here        
        }
    }

在单元格中为10/53

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! CollectionViewCell


    // Configure the cell
    if indexPath.row == 0 {
     cell.txxt.text = "Biz memorabilia: 1st day in business, a cold & cloudy day in 1955, @McDonalds did $366.12 in revenue on 2 registers.Biz memorabilia: 1st day in business, a cold & cloudy day in 1955, @McDonalds did $366.12 in revenue on 2 registers."

    }
    if indexPath.row == 1 {
        cell.txxt.text = "SmartHalo: Turn any bike into a smart bike http://www.producthunt.com/tech/smarthalo  via @gozmike on @producthunt"

    }
    if indexPath.row == 2 {
        cell.txxt.text = "Traditionally, policymakers & nonprofits try to improve financial health by measuring & teaching financial literacy"

    }

    //slideNumber is uilabel in the collectionViewCell
    cell.slideNumber.text =  NSString(format: "%d/%d", indexPath.row, totalCell) // totalCell is num of cells you have

    return cell
}