如何从不同的方法访问 UICollectionViewCell 中标签的文本？

Posted 2023-02-27

【中文标题】如何从不同的方法访问 UICollectionViewCell 中标签的文本？

【英文标题】：How to access text of a label in a UICollectionViewCell from a different method?

【发布时间】：2014-12-17 21:48:17

【问题描述】：

我有一个UICollectionViewController 类型的类。在这个类中，我有一个UICollectionViewCell 标签的变量：

var cellTitle = UILabel()

我也有collectionView方法cellForItemAtIndexPath：

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as UICollectionViewCell
    var definitions = shuffle(["Used to carry the pharoah","Used to carry bodies as a ceremony","Had a flat deck to carry a farmer's treasure","Daily, it made a trip around the world to carry Ra","Towed by smaller boats, carrying heavy objects","Used for business and pleasure by officials/nobles","Carried most Egyptians and some goods"])
    var boatTypes = shuffle(["Ferry","Funeral Barge","Cargo Boat","Cattle Boat","Royal Boat","The Sun Boat","Grand Boat"])
    // Configure the cell
    cellTitle = UILabel(frame: CGRectMake(0, 0, cell.bounds.size.width, 160))
    cell.contentView.addSubview(cellTitle)
switch indexPath.item 
    case 0:
        cellTitle.text = definitions[0]
    case 1:
        cellTitle.text = definitions[1]
    case 2:
        cellTitle.text = definitions[2]
    case 3:
        cellTitle.text = definitions[3]
    case 4:
        cellTitle.text = definitions[4]
    case 5:
        cellTitle.text = definitions[5]
    case 6:
        cellTitle.text = definitions[6]
    case 7:
        cellTitle.text = boatTypes[0]
    case 8:
        cellTitle.text = boatTypes[1]
    case 9:
        cellTitle.text = boatTypes[2]
    case 10:
        cellTitle.text = boatTypes[3]
    case 11:
        cellTitle.text = boatTypes[4]
    case 12:
        cellTitle.text = boatTypes[5]
    case 13:
        cellTitle.text = boatTypes[6]
    default:
        break

我还有一个didSelectItemAtIndexPath 方法：

override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) 
    var selectedText = cellTitle.text
    switch indexPath.item 
    case 0:
        if selectedText == "Used to carry the pharoah" 
            println("Used to carry the pharoah")
         else 
            println("Not Working")
        

问题是，当我按下标签上确实有“用于携带法老”文本的单元格时，会触发println("Not Working")。如何将cellForItemAtIndexPath 方法中的值传递给didSelectItemAtIndexPath 方法，使cellTitle 的值保持不变？谢谢。

【问题讨论】：

您可以使用传递给函数的indexPath 来检索单元格，但不要这样做。相反，使用 indexPath 直接转到您的数据模型（在本例中为数组） - 但您应该将数组移出 cellForItemAtIndexPath 函数 - 继续重新定义数组非常低效。你也可以用一个 if 替换那个 case 语句列表。

【参考方案1】：

cellForItemAtIndexPath 在要显示时为每个项目调用。您正在对字符串数组应用某种“洗牌”？因此，并非所有字符串都必须使用，并且一些字符串将具有相同的文本。 您可以简单地全局初始化变量“定义”和“船”，然后像这样访问值：

if indexPath.item < 7 
    selectedText = definitions[indexPath.item]
 else 
    selectedText = boatTypes[indexPath.item]
 

【讨论】：

谢谢！这解决了我的问题！编码也少得多:)