Question

我正在使用 UISwipeGestureRecognizer 检测 UITableViewCell 中某个单元格的滑动，类似于THIS LINK，这将允许用户'喜欢'一张照片。

问题是我不太了解如何更改特定帖子的 Like 值-而且它不像其他“内置”方法那样具有indexPath。我也不明白如何使用主要显示在屏幕上的单元格，因为可能有多个单元格尚未“出队”？：

@objc func mySwipeAction (swipe: UISwipeGestureRecognizer) {

    switch swipe.direction.rawValue {
    case 1:
        print ("the PostID you selected to LIKE is ...")

    case 2:
          print ("the PostID you selected to Undo your LIKE is ...")

    default:
        break
    }
}

我的tableView看起来像这样：

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "postTopContributions", for: indexPath) as! PostTopContributions
    let postImage = postImageArray [indexPath.row]
    let imageURL = postImage.postImageURL

    cell.delegate = self

    cell.postSingleImage.loadImageUsingCacheWithUrlString(imageURL)
    cell.postSingleLikes.text = "\(postImageArray [indexPath.row].contributionPhotoLikes)"
    cell.postSingleImage.isUserInteractionEnabled = true


    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(self.mySwipeAction(swipe:)))
    let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(self.mySwipeAction(swipe:)))

    leftSwipe.direction = UISwipeGestureRecognizerDirection.left
    rightSwipe.direction = UISwipeGestureRecognizerDirection.right

    cell.postSingleImage.addGestureRecognizer(leftSwipe)
    cell.postSingleImage.addGestureRecognizer(rightSwipe)

    let selectedCell = self.postImageArray [indexPath.row]

    return cell
}

我不想使用向左滑动的本机TableView行删除方法-在这种特定情况下出于各种UX目的。

Answer 1

您可以尝试

cell.postSingleImage.addGestureRecognizer(leftSwipe)
cell.postSingleImage.addGestureRecognizer(rightSwipe)
cell.postSingleImage.tag = indexPath.row

不建议在cellForRowAt中添加手势，您可以添加它们在init中用于程序化单元，在awakeFromNib中用于xib / 原型细胞

@objc func mySwipeAction (swipe: UISwipeGestureRecognizer) {

    let index = swipe.view.tag
    let selectedCell = self.postImageArray[index]
    switch swipe.direction.rawValue {
    case 1:
        print ("the PostID you selected to LIKE is ...")
       // edit dataSource array
    case 2:
          print ("the PostID you selected to Undo your LIKE is ...")
       // edit dataSource array

    default:
        break

   // reload table IndexPath
    }
}

Answer 2

您可以在选择器中将索引路径作为参数传递。然后在yourArray [indexpath.row]

中添加类似内容

Answer 3

您可以设置要将GestureRecognizer添加到单元格本身的indexPath行的单元格图像的标签：

cell.postSingleImage.tag = indexPath.row
cell.postSingleImage.addGestureRecognizer(leftSwipe)
cell.postSingleImage.addGestureRecognizer(rightSwipe)

然后，您可以通过获取触发了滑动手势的视图标签来确定哪个单元格触发了GestureRecognizer：

@objc func mySwipeAction (gesture: UISwipeGestureRecognizer) {
     let indexPathRow = gesture.view.tag
     let indexPath = IndexPath(row: indexPathRow, section: 0) // assuming this is a 1 column table not a collection view
     if let cell = tableView.cellForRow(at: indexPath) as? PostTopContributions {
          // ... and then do what you would like with the PostTopContributions cell object
          print ("the PostID you selected to LIKE is ... " + cell.id)

     }

}

希望这对您有所帮助！

在UITableViewCell上滑动以按赞无法正常工作-Swift

3 个答案: