Ios Segue未将值从my StoriesTableViewController传递到SingleArtCallViewController。为什么会这样？

如果用户单击我的StoriesTableViewController中的表项，我需要将id值传递给SingleArtCallViewController，以便SingleArtCallViewController可以显示适当的详细信息

问题是，如果我打印用户按下的项目的id，它就正确地打印了它。但是它不会在另一个ViewController中接收。有人能帮我解决这个问题吗

StoriesTableViewController：

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    myIndex = indexPath.row

    finalId = idTable[myIndex]

    let story = stories[indexPath.row]
    ArtcallID = story.id


   performSegue(withIdentifier: "singleArtcall", sender: self)
}

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


print(ArtcallID + "is the index of the item that was selected")
   //this correctly prints the id
let id = segue.destination as! SingleArtcallViewController
    id.ArtcallID = ArtcallID
 //  print("id: ",id)

   }

var ArtcallID: String!

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        print("ArtcallID: ", ArtcallID)

        //If I print this I"m getting the result "ArtcallID:  some("")"


    }

SingleArtCallViewController：

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    myIndex = indexPath.row

    finalId = idTable[myIndex]

    let story = stories[indexPath.row]
    ArtcallID = story.id


   performSegue(withIdentifier: "singleArtcall", sender: self)
}

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


print(ArtcallID + "is the index of the item that was selected")
   //this correctly prints the id
let id = segue.destination as! SingleArtcallViewController
    id.ArtcallID = ArtcallID
 //  print("id: ",id)

   }

var ArtcallID: String!

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        print("ArtcallID: ", ArtcallID)

        //If I print this I"m getting the result "ArtcallID:  some("")"


    }

Story.swift：

import Firebase

class Story
{
    var id: String = ""
    var text: String = ""
    var numberOfLikes = 0
    var numberOfAngry = 0
    let ref: DatabaseReference!
    var fundedAmt: Int = 0
    var targetAmt: Int = 0
    var perfCity: String = ""
    var targetDate: IntMax = 0
    var backers: Int = 0
    var fundedPercent: Int = 0
    var imageURL: String = ""

    init(text: String) {
        self.text = text
        ref = Database.database().reference().child("Fund").childByAutoId()
    }

    init(snapshot: DataSnapshot)
    {
        ref = snapshot.ref
        if let value = snapshot.value as? [String : Any] {
            text = value["artist_name"] as! String
            backers = value["total_backers"] as! Int
            perfCity = value["perf_location"] as! String
            fundedAmt = value["amount_funded"] as! Int
            targetAmt = value["target_amount"] as! Int
            fundedPercent = value["percent_funded"] as! Int

          //  numberOfLikes = value["numberOfLikes"] as! Int
          //  numberOfAngry = value["numberOfAngry"] as! Int
            id = snapshot.key
        }
    }

---

可以肯定的是，您的：story.id是字符串吗

您是否尝试通过另一个测试值？如果是这样的话，它有效吗

试试这个：

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

   if segue.identifier == "singleArtcall"{
        let id = segue.destination as! SingleArtCallViewController
        id.getID = ArtcallID
       }
}

---

如果我正确理解您试图实现的目标，并且您通过将控件从原型单元格拖动到SingleArtcallViewController来创建segue：

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    myIndex = indexPath.row

    finalId = idTable[myIndex]

    let story = stories[indexPath.row]
    ArtcallID = story.id


   performSegue(withIdentifier: "singleArtcall", sender: self)
}

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


print(ArtcallID + "is the index of the item that was selected")
   //this correctly prints the id
let id = segue.destination as! SingleArtcallViewController
    id.ArtcallID = ArtcallID
 //  print("id: ",id)

   }

var ArtcallID: String!

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        print("ArtcallID: ", ArtcallID)

        //If I print this I"m getting the result "ArtcallID:  some("")"


    }

代码不起作用的具体原因是为segue做准备：。。。在tableView之前运行\uTableView:UITableView，在indexPath:indexPath上运行。跑得越快，准备赛格两次

如果是这样，你就不需要这个方法了

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)

只需使用preparefor segue:…：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    guard let selectedRow = tableView.indexPathForSelectedRow?.row,
        let vc = segue.destination as? SingleArtcallViewController else {return}
    vc.artCallId = stories[selectedRow].id
}

---

SingleArtCallViewController或SingleArtCallViewController哪一个是对的？SingleArtCallViewController是对的。但要回答您的问题，如果我传递字符串“hello”，就会被传输！让我上传我的Story.swift文件。尝试在if条件后的prepare中添加一个print，它正在打印什么？因此我在if之后添加了以下print语句：printgetID+是getID的值。ARtcallID的值是：+ARtcallID My output:是getID的值。ARtcallID的值为：-asdffdsa123，这意味着ARtcallID被正确记录，但字符串getID未采用其值。我不知道为什么。像做梦一样工作！非常感谢！