不要将UILongPressGestureRecognizer添加到Cell。将其添加到viewDidLoad中的UITableView

let longPress = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(sender:)))
tableView.addGestureRecognizer(longPress)

通过以下方式获取接触的单元格索引

@objc private func handleLongPress(sender: UILongPressGestureRecognizer) {
    if sender.state == .began {
        let touchPoint = sender.location(in: tableView)
        if let indexPath = tableView.indexPathForRow(at: touchPoint) {
            // your code here, get the row for the indexPath or do whatever you want
        }
    }
}

使用didSelectRowAtIndexPath而不是UITapGestureRecognizer是更好的方法

更新Swift4：
将这些行添加到viewController类的viewDidLoad中（在本例中，类的名称为YourViewController）

override func viewDidLoad() {
    super.viewDidLoad()

    let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(ViewController.longPress(longPressGestureRecognizer:)))
    self.view.addGestureRecognizer(longPressRecognizer)
}

现在，将此func添加到viewController类中

@objc func longPress(longPressGestureRecognizer: UILongPressGestureRecognizer) {

    if longPressGestureRecognizer.state == UIGestureRecognizerState.began {
        let touchPoint = longPressGestureRecognizer.location(in: self.view)
        if let indexPath = tableView.indexPathForRow(at: touchPoint) {
            // add your code here
            // you can use 'indexPath' to find out which row is selected
        }
    }
}

根据巴拉的答案，这里是swift 4或5

override func viewDidLoad() {
        super.viewDidLoad()
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(longpress))
        tableView.addGestureRecognizer(longPress)
    }

方法如下

@objc func longPress(sender: UILongPressGestureRecognizer) {

            if sender.state == UIGestureRecognizer.State.began {
                let touchPoint = sender.location(in: tableView)
                if let indexPath = tableView.indexPathForRow(at: touchPoint) {
                    // your code here, get the row for the indexPath or do whatever you want
                    print("Long press Pressed:)")
                }
            }

        }