Question

我的桌面视图的didSelectRowAt功能出现问题。出于某种原因，尽管我的segue标识符和目标视图是正确的，但当我单击该行时，它不会加载任何内容。此外，Xcode告诉我：

无法指定类型的值＆＃39; Double？＆＃39;输入＆＃39; String？＆＃39;

但我找不到告诉我如何解决此问题的在线资源。作为参考，我想要显示的数据来自嵌套的JSON提要。

JSON Struct

struct PlayerStatsParent:Decodable{
    let rankings: [PlayerStats]
}

struct PlayerStats:Decodable {
    let personaname: String?
    let score: Double?
    let solo_competitive_rank: Int?
    let avatar: String?
}

单元格选择功能

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    performSegue(withIdentifier: "showDetail", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let destination = segue.destination as? RankDetail {
        destination.playerRank = rank[(rankTable.indexPathForSelectedRow?.row)!]
    }
}

目标视图控制器代码

import UIKit

class RankDetail: UIViewController {
    @IBOutlet var rankLabel: UILabel!
    @IBOutlet var scoreLabel: UILabel!

    var playerRank:PlayerStats?

    override func viewDidLoad() {
        super.viewDidLoad()
        rankLabel.text = "\(playerRank?.solo_competitive_rank)"
        scoreLabel.text = playerRank?.score
    }

Answer 1

同时检查你的选择方法。应该是这个。

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "showDetail", sender: self)

不是这个;

Event.where(id: @events.map(&:id))
     .includes(
               :user, 
               :event_category, 
               task: [:document_tasks, task_followers: :follower] 
              )

}

如果选择单元格。

Answer 2

看起来RankDetail类中出现错误。这是一个简单的解决方法。

class RankDetail: UIViewController {
    @IBOutlet var rankLabel: UILabel!
    @IBOutlet var scoreLabel: UILabel!

    var playerRank:PlayerStats?

    override func viewDidLoad() {
        super.viewDidLoad()
        rankLabel.text = "\(playerRank?.solo_competitive_rank)"
        // scoreLabel.text if of type String?, so it can't store Double? directly
        // scoreLabel.text = playerRank?.score
        // converting to String? should fix it
        scoreLabel.text = "\(playerRank?.score)"
}

编辑：使用以下代码显示ViewController。省去了担心segues的麻烦。

if let viewController = storyboard?.instantiateViewController(withIdentifier: "NewViewController") {
      present(viewController, animated: true, completion: nil)

}

单击Tableview单元格不显示数据

2 个答案: