ios - 添加到单元格的点击手势是否在重复使用时得到保留？

Question

我有一个带有图像的单元格。我正在向它的 tableview 委托(delegate)方法添加点击手势。当单元格被重用时，点击手势是否重复？点击手势会发生什么？

class CalendarCell: UITableViewCell {
    @IBOutlet weak var locationImageView: UIImageView!
}

class CalendarViewController: UIViewController {

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "calendarCell") as! CalendarCell
        let locationLabelTap = UITapGestureRecognizer(target: self, action: #selector(locationDidTap(recognizer:)))
        cell.locationLabel.addGestureRecognizer(locationLabelTap)
        return cell
    }

    @objc func locationDidTap(recognizer: UITapGestureRecognizer) {
    }
}

Answer 1

简短回答:是

---

长答案:

你不应该那样做。在初始化单元格时添加点击手势。这样，tap 仅在创建时添加一次，而不是每次重复使用时添加。

class CalendarCell: UITableViewCell {

    //Your variable declaration and other stuff
    .
    .
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        //Adding subviews, constraints and other stuff
        .
        .
        .
        let locationLabelTap = UITapGestureRecognizer(target: self, action: #selector(locationDidTap(recognizer:)))
        locationLabel.addGestureRecognizer(locationLabelTap)
    }
    .
    .
    .

}

如果您正在使用 Storyboard，您应该在 awakeFromNib 文件中执行相同的操作，如 @DuncanC 所指出的那样.

override func awakeFromNib() {
    super.awakeFromNib()

    .
    .
    .
    let locationLabelTap = UITapGestureRecognizer(target: self, action: #selector(locationDidTap(recognizer:)))
    locationLabel.addGestureRecognizer(locationLabelTap)
}