Question

我一直在阅读各种执行segue的方法。我想通过点击单元格来进行推送。我在情节提要中有主题，所以我没有使用didSelectForRow函数：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        guard let selectedRow = self.tableView.indexPathForSelectedRow as? Int else { return }

        if segue.identifier == "detail", let vc = segue.destination as? DetailViewController {
            vc.playerImage = UIImageView(image: UIImage(named: "userIcon"))
            vc.currentRankingLabel.text = String(players[selectedRow].ranking)
            vc.scoreLabel.text = String("\(players[selectedRow].wins) - \(players[selectedRow].losses)")
        }
    }

这是我目前所掌握的。它可以编译，但是单元格不会对点击做出反应！

Answer 1

indexPathForSelectedRow从未是Int，而是IndexPath?。删除条件下调，并从其row属性中获取行

guard let selectedPath = self.tableView.indexPathForSelectedRow else { return }
let selectedRow = selectedPath.row

if segue.identifier == "detail", let vc = segue.destination as? DetailViewController {
        vc.playerImage = UIImageView(image: UIImage(named: "userIcon"))
        vc.currentRankingLabel.text = String(players[selectedRow].ranking)
        vc.scoreLabel.text = String("\(players[selectedRow].wins) - \(players[selectedRow].losses)")
    }

但是如果segue连接到了单元格，我建议使用代表单元格的sender参数

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

     if segue.identifier == "detail", let vc = segue.destination as? DetailViewController {
        let selectedPath = self.tableView.indexPath(for: sender as! UITableViewCell)!
        let selectedRow = selectedPath.row
        vc.playerImage = UIImageView(image: UIImage(named: "userIcon"))
        vc.currentRankingLabel.text = String(players[selectedRow].ranking)
        vc.scoreLabel.text = String("\(players[selectedRow].wins) - \(players[selectedRow].losses)")
     }
}

重要提示：

请注意，prepare(for中未连接目标控制器中的插座，因此将不显示任何内容，甚至导致代码崩溃。

Answer 2

我认为您需要在选择单元格时致电performSegue，如下所示

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        self.performSegue(withIdentifier: "detail", sender: indexPath)
    }

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     guard let selectedPath = sender as? IndexPath, let selectedRow = selectedPath.row, let player = players[selectedRow] else {
        return
     }
     if segue.identifier == "detail", let vc = segue.destination as? DetailViewController {
        vc.playerImage = UIImageView(image: UIImage(named: "userIcon"))
        vc.currentRankingLabel.text = String(player.ranking)
        vc.scoreLabel.text = String("\(player.wins) - \(player.losses)")
     }
}

单击后无法从Cell推送推功能

2 个答案: