是否可以从 collectionViewCell 中检索数据?

问题描述

我想从可见单元格中检索数据，例如 label.text，但我不知道这怎么可能.

I'm looking to retrieve data, such as a label.text from within a visible cell, and I don't know how that would be possible.

简单的上下文:我有一个显示问题的 collectionView(每个单元格显示一个问题)collectionView 在 UIView 中.

Plain context: I have a collectionView displaying questions (each cell display a question)the collectionView is within a UIView.

在同一个 uiview 中，我有一个按钮，按下时应验证问题答案.在这一点上，我唯一要做的就是将 @IBAction 链接到按钮，以便它从可见单元格中打印问题(只有一个单元格可见).

Within this same uiview I have a button which, when pressed, should validate the question answer.At this point the only thing Im doing is linking a @IBAction to the button in order for it to println the question from the visible cell (only one cell is visible).

这是我构造单元格的方法

here is how I construct the cell

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        return 1
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
//        return arr.count
        return questionData.count
    }

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

        let thereq:PFObject = self.questionData.objectAtIndex(indexPath.row) as PFObject

//        cell.contentView.frame = cell.bounds
        var action = thereq.objectForKey("action") as String
        var what = thereq.objectForKey("what") as String
        cell.askingQuestionLabel.text = "where \(action) \(what)"

        return cell
    }

按钮触摸(按钮在单元格外).

on button touch (button is out of the cell).

我知道 visibleCells() 存在，但看起来我无法从中检索信息.

I know visibleCells() exists but it doesn't look like I can retrieve info out of it.

        for cell in self.collectionView!.visibleCells() as [UICollectionViewCell] {

        }

有什么办法吗?

推荐答案

要访问可见单元格内的数据(例如label.text)，可以使用visibleCells() 方法如下:

To access data (such as a label.text) within a visible cell, you can use the visibleCells() method as follow:

for item in self.collectionView!.visibleCells() as [UICollectionViewCell] {
            var indexpath : NSIndexPath = self.collectionView!.indexPathForCell(item as CollectionViewCell)!
            var cell : CollectionViewCell = self.collectionView!.cellForItemAtIndexPath(indexpath) as CollectionViewCell

            //access cell data
            println(cell.labelName.text)
        }

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