ios - 我的变量值与 prepareForSegue 在传输时采用的值不同？

Question

本质上，我的变量 (playerErrors) 是通过按下按钮来更新的，然后 View Controller 通过数据传输被转移到下一个。但是，变量的值(例如应该从 0 增加 1)转换为 0(就像没有按下按钮一样)。我在我的代码中有 16 个变量要传输，但奇怪的是其中一半 (8) 确实有效，而有效的变量都是针对对手的值。不起作用的 8 个是玩家值(如 playerErrors)。

我是 XCode 新手。我正在高中上课，我们是第一次学习编码，所以我还不是很擅长，但我已经遇到这个问题好几天了，我无法解决!我在下面包含了我的 View Controller 的代码。

当 youErrorDeep 被触发时，它会打印“segueing from self 0 to dvc: 0”。

//
//  ThirdViewController.swift
//  rally
//
//  Created by GBernero on 12/6/16.
//  Copyright © 2016 GBernero. All rights reserved.
//

import UIKit

class ThirdViewController: UIViewController {

    @IBOutlet weak var emptyTennisCourt: UIImageView!
    @IBOutlet weak var labelOpponent: UILabel!
    @IBOutlet weak var labelPlayer: UILabel!

    var playerWinners = 0 //holds total amount of winners player has hit
    var playerShortWinners = 0 //holds amount of winners play has hit short
    var playerDeepWinners = 0 //holds amount of winners play has hit deep
    var playerErrors = 0 //holds total amount of errors play has hit
    var playerErrorsLeft = 0 //holds amount of errors play has hit left
    var playerErrorsRight = 0 //holds amount of errors play has hit right
    var playerErrorsDeep = 0 //holds amount of errors play has hit deep
    var playerErrorsNet = 0 //holds amount of errors play has hit in the net
    var opponentWinners = 0 //holds total amount of winners opponent has hit
    var opponentShortWinners = 0 //holds amount of winners opponent has hit short
    var opponentDeepWinners = 0 //holds amount of winners opponent has hit deep
    var opponentErrors = 0 //holds total amount of errors opponent has hit
    var opponentErrorsLeft = 0 //holds amount of errors opponent has hit left
    var opponentErrorsRight = 0 //holds amount of errors opponent has hit right
    var opponentErrorsDeep = 0 //holds amount of errors opponent has hit deep
    var opponentErrorsNet = 0 //holds amount of errors opponent has hit in the net

    override func prepare(for segue: UIStoryboardSegue, sender: Any?)
    {
        let dvc = segue.destination as! SixthViewController
        dvc.playerErrorsDeep = self.playerErrorsDeep
        print("segueing from self \(self.playerErrorsDeep) to dvc: \(dvc.playerErrorsDeep)")
        dvc.playerErrorsNet = self.playerErrorsNet
        dvc.playerErrorsLeft = self.playerErrorsLeft
        dvc.playerErrorsRight = self.playerErrorsRight
        dvc.playerErrors = self.playerErrors
        dvc.playerShortWinners = self.playerShortWinners
        dvc.playerDeepWinners = self.playerDeepWinners
        dvc.playerWinners = self.playerWinners
        dvc.opponentErrorsDeep = self.opponentErrorsDeep
        print("segueing to dvc2: \(dvc.opponentErrorsDeep)")
        dvc.opponentErrorsNet = self.opponentErrorsNet
        dvc.opponentErrorsLeft = self.opponentErrorsLeft
        dvc.opponentErrorsRight = self.opponentErrorsRight
        dvc.opponentErrors = self.opponentErrors
        dvc.opponentShortWinners = self.opponentShortWinners
        dvc.opponentDeepWinners = self.opponentDeepWinners
        dvc.opponentWinners = self.opponentWinners

    }

    override func viewDidLoad()
    {
        self.navigationItem.setHidesBackButton(true, animated: false) //removes back button from access by user

        self.view.backgroundColor = UIColor(patternImage: UIImage(named: "tennis_background.jpg")!) //sets background of view controller to the background image


        super.viewDidLoad()
    }

    @IBAction func youErrorDeep(_ sender: Any)
    {
        playerErrors += 1
        playerErrorsDeep += 1
        print("deep \(playerErrors), \(playerErrorsDeep)")
    }
    @IBAction func youErrorLeft(_ sender: Any)
    {
        playerErrors += 1
        playerErrorsLeft += 1
    }

    @IBAction func youErrorRight(_ sender: Any)
    {
        playerErrors += 1
        playerErrorsRight += 1
    }

    @IBAction func youWinnerDeep(_ sender: Any)
    {
        playerWinners += 1
        playerDeepWinners += 1
    }

    @IBAction func youWinnerShort(_ sender: Any)
    {
        playerWinners += 1
        playerShortWinners += 1
    }

    @IBAction func youErrorNet(_ sender: Any)
    {
        playerErrors += 1
        playerErrorsNet += 1
    }

    @IBAction func opponentErrorDeep(_ sender: Any)
    {
        opponentErrors += 1
        opponentErrorsDeep += 1
        print( "it happens")
    }

    @IBAction func opponentErrorLeft(_ sender: Any)
    {
        opponentErrors += 1
        opponentErrorsLeft += 1
    }

    @IBAction func opponentErrorRight(_ sender: Any)
    {
        opponentErrors += 1
        opponentErrorsRight += 1
    }

    @IBAction func opponentWinnerDeep(_ sender: Any)
    {
        opponentWinners += 1
        opponentDeepWinners += 1
    }

    @IBAction func opponentWinnerShort(_ sender: Any)
    {
        opponentWinners += 1
        opponentShortWinners += 1
    }

    @IBAction func opponentErrorNet(_ sender: Any)
    {
        opponentErrors += 1
        opponentErrorsNet += 1
    }




    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */


}

Answer 1

它应该与这样的东西一起工作:

@IBAction func youErrorDeep(_ sender: Any){
    playerErrors += 1
    playerErrorsDeep += 1
    print("deep \(playerErrors), \(playerErrorsDeep)")
    self.performSegue(withIdentifier: "segueForYouErrorDeep", sender: self) //instead of "segueForYourErrorDeep" use the identifier for the correct segue
}

你必须给每个 segue 一个唯一的标识符，但这样你仍然可以在一定程度上使用 Storyboard。

这也确保了 segue 在操作之后执行。

如果您不确定如何为 segue 提供标识符，您所要做的就是单击 segue 图形，然后在属性下将标识符设置为任意字符串。