How to toggle visibility with the UILabel in UITableViewCell?

问题

I have this chunk of code in my ViewController named PlayViewController:

words = [String]()

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cellIdentifier = "PlayTableViewCell"
    guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? PlayTableViewCell else {
        fatalError("The dequeued cell is not an instance of PlayTableViewCell.")
    }

    // Configure the cell...
    cell.wordLabel.text = words[indexPath.row]

    if (indexPath.row == 0) {
        cell.wordLabel.isHidden = false
    }

    return cell
}

And this is my code for TableViewCell named PlayTableViewCell:

import UIKit

class PlayTableViewCell: UITableViewCell {

    //MARK: Properties
    @IBOutlet weak var wordLabel: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code

        wordLabel.lineBreakMode = .byWordWrapping;
        wordLabel.numberOfLines = 0;
        wordLabel.isHidden = true

    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
}

As expected, only my first wordLabel appears in my tableView. My goal is to reveal the second wordLabel when the user swipes right or left anywhere on the screen and continue this way until the user reveal the last wordLabel.

I've found how to set the swipe part (only the swipe right, behaves weirdly when the left is added) but I can't figure out how to toggle .isHidden property when I detect the gesture.

I'm not sure to be on the right path with the cell configuration but because of the placing of the wordLabel inside PlayTableViewCell, it's hard to reach it outside the function tableView.

I can index neither cell nor wordLabel and I can't figure out how could I reach the right wordLabel to toggle its visibility.

回答1:

Somewhere store property for sum of revealed labels

var numberOfRevealedLabels = 1

then every time user swipes somewhere, increase this value and then reload data of your table view (you can reload it in didSet of your variable or after you increase this value in action which is called by swiping)

numberOfRevealedLabels += 1

Now, since cells are reusable, set visibility depending on if indexPath.row is less then or equal to numberOfRevealedLabels - 1

cell.wordLabel.isHidden = !(indexPath.row <= numberOfRevealedLabels - 1)

... this also covers the case that indexPath.row is greater

来源：https://stackoverflow.com/questions/54028309/how-to-toggle-visibility-with-the-uilabel-in-uitableviewcell