Question

注意：问题已被编辑，以便更清楚我的问题。

嘿，我正在尝试通过多个VCS传递数据。我想从V2传递数据（数组） - ＆gt; V3然后V3 - ＆gt; V1但我希望能够仅通过VC导航：V1 - V2 - V3和V3 - V2 - V1。所以我需要学习的是如何在不导航到不同VC的情况下传递数据，以及设置两个preparetosegue方法来在V2之间传递数据 - ＆gt; V3和V3 - ＆gt; V1同时还能够在所有VC之间导航。当我创建我的第一个preparetosegue时，我无法使用我的VC中关联的其他segue导航到其他VC而不会出现致命错误。谁能帮我？任何意见都将非常感谢！

继承我的尝试：

import UIKit

class ViewController: UIViewController {
var name = String()
var StopButInfo = [String]()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
     }


}


  import UIKit

  class SecondViewController: UIViewController {

  var StringArray = [String]()


override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}


@IBOutlet var PHeight: UITextField!
@IBOutlet var PName: UITextField!



@IBAction func Search(_ sender: Any) {
    if PHeight.text != ""{
        performSegue(withIdentifier: "SearchSegue", sender: self)}
    let CDstart = String(describing: Date())
    StringArray.append(CDstart)
    StringArray.append(PName.text!)
    StringArray.append(PHeight.text!)
    }




override func prepare(for SearchSegue: UIStoryboardSegue, sender: Any?){
    let thirdController = SearchSegue.destination as! ThirdViewController
    thirdController.SearchButInfo = StringArray
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
     }


   }

 import UIKit

 class ThirdViewController: UIViewController {
var height = String()
var SearchButInfo = [String]()

var StringArray = [String]()



@IBAction func Stop(_ sender: Any) {
    if StringArray.count != 0{
        performSegue(withIdentifier: "SegueToStart", sender: self)
    }
    let CDStop = String(describing: Date())
    StringArray.append(CDStop)
    StringArray.append(height)
}





override func prepare(for SegueToStart: UIStoryboardSegue, sender: Any?){
    let firstController = SegueToStart.destination as! ViewController
    firstController.StopButInfo = StringArray}





override func viewDidLoad() {
    super.viewDidLoad()


    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


  }

Answer 1

您需要检查哪个视图控制器的segue将要执行，这可以在prepare(for segueMVH: UIStoryboardSegue, sender: Any?)方法内完成：

if let firstController = segueMVH.destination as! FirstViewController {
    // Set first view controller's data

} else if let secondController = segueMVH.destination as! SecondViewController {
    // Set second view controller's data

} else if let thirdController = segueMVH.destination as! ThirdViewController {
    // Set third view controller's data
}

注意：最好为每个segue使用不同的标识符来区分它们。

Answer 2

您在let secondController = segueMVH.destination as! ThirdViewController上遇到的错误是说您将HC.ViewController置于ThirdViewController，这就是失败的原因。这意味着您的segue的目标视图控制器不是ThirdViewController。

进一步帮助您理解segue：segue是源视图控制器和目标视图控制器之间的连接，并且只能在它们之间使用两个。看这张图：在这种情况下，我的故事板中有一个segue连接，连接在我的VC1按钮和VC2之间。在这种情况下，我的按钮单击将触发此segue，prepare(for segue)方法只能在VC1中将数据传递给VC2。

所以在你的情况下，你认为你的segue的目的地是ThirdViewController，但事实并非如此。因此，请检查标识为segueMVH的segue，看看它是否已连接到您当前的视图控制器和ThirdViewController之间。

希望这有帮助

使用segue [Swift 3.0 Xcode]通过多个视图控制器传递数据

2 个答案: