ios - 单击表格行时在 SecondViewController 上显示错误信息

Question

我第一次尝试构建一个分组的而不是简单的 tableView，但在点击单元格时显示的信息不正确时遇到了问题。

首先，我创建了一个数组，该数组用于为我的组提供标题。接下来我有一个数组，其中包含另外 4 个数组，每个数组包含 8 个对象，最后一个数组只有 1 个，这 4 个数组是我的组部分。

当应用程序运行时，组表会完全按照应有的方式显示，但当您单击特定行时，它可能会显示本应用于另一行的信息。我从数组中删除了一些对象，只是为了让您在这里看到的代码更短。

rune :

import UIKit

struct Rune {
    var runeName: String
    var runeImage: UIImage
    var runeDescription: String

}

View Controller :

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet weak var tableView: UITableView!

    var runeTitle = [["Freyr/Freya's Aett"], ["Heimdall's Aett"], ["Tyr's Aett"], ["Additional Runes"]]

    let runes = [[Rune(runeName: "Fehu", runeImage: UIImage(named: ("Fehu.png"))!, runeDescription: "(F: Domestic cattle, wealth.) Possessions won or earned, earned income, luck. Abundance, financial strength in the present or near future. Sign of hope and plenty, success and happiness. Social success. Energy, foresight, fertility, creation/destruction (becoming).\n\n Fehu Reversed or Merkstave: Loss of personal property, esteem, or something that you put in effort to keep. It indicates some sort of failure. Greed, burnout, atrophy, discord. Cowardice, stupidity, dullness, poverty, slavery, bondage."),
                  Rune(runeName: "Wunjo", runeImage: UIImage(named: ("Wunjo.png"))!, runeDescription: "(W or V: Joy.) Joy, comfort, pleasure. Fellowship, harmony, prosperity. Ecstasy, glory, spiritual reward, but also the possibility of going \"over the top\". If restrained, the meaning is general success and recognition of worth.\n\n Wunjo Reversed or Merkstave: Stultification, sorrow, strife, alienation. Delirium, intoxication, possession by higher forces, impractical enthusiasm. Raging frenzy, berzerker.")],

                 [Rune(runeName: "Hagalaz", runeImage: UIImage(named: ("Hagalaz.png"))!, runeDescription: "(H: Hail.) Wrath of nature, destructive, uncontrolled forces, especially the weather, or within the unconscious. Tempering, testing, trial. Controlled crisis, leading to completion, inner harmony. Hagalaz Merkstave (Hagalaz cannot be reversed, but may lie in opposition): Natural disaster, catastrophe. Stagnation, loss of power. Pain, loss, suffering, hardship, sickness, crisis."),
                  Rune(runeName: "Sowilo", runeImage: UIImage(named: ("Sowilo.png"))!, runeDescription: "(S: The sun.) Success, goals achieved, honor. The life-force, health. A time when power will be available to you for positive changes in your life, victory, health, and success. Contact between the higher self and the unconscious. Wholeness, power, elemental force, sword of flame, cleansing fire. Sowilo Merkstave (Sowilo cannot be reversed, but may lie in opposition): False goals, bad counsel, false success, gullibility, loss of goals. Destruction, retribution, justice, casting down of vanity. Wrath of god.")],

                 [Rune(runeName: "Tiwaz", runeImage: UIImage(named: ("Tiwaz.png"))!, runeDescription: "(T: Tyr, the sky god.) Honor, justice, leadership and authority. Analysis, rationality. Knowing where one's true strengths lie. Willingness to self-sacrifice. Victory and success in any competition or in legal matters.\n\n Tiwaz Reversed or Merkstave: One's energy and creative flow are blocked. Mental paralysis, over-analysis, over-sacrifice, injustice, imbalance. Strife, war, conflict, failure in competition. Dwindling passion, difficulties in communication, and possibly separation."),
                  Rune(runeName: "Othala", runeImage: UIImage(named: ("Othala.png"))!, runeDescription: "(O: Ancestral property.) Inherited property or possessions, a house, a home. What is truly important to one. Group order, group prosperity. Land of birth, spiritual heritage, experience and fundamental values. Aid in spiritual and physical journeys. Source of safety, increase and abundance.\n\n Othala Reversed or Merkstave: Lack of customary order, totalitarianism, slavery, poverty, homelessness. Bad karma, prejudice, clannishness, provincialism. What a man is bound to.")],

                  [Rune(runeName: "Blank Rune", runeImage: UIImage(named: ("Blank.png"))!, runeDescription: "There is no historical support for a \"Blank Rune\" in runic divination. It was invented in the 1980's. It should not be used in a rune casting. If you bought a rune set with a blank piece, save it in case you lose another rune piece, but don't use it in rune casting.")]]

    func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return runes.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return runes[section].count
}


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    // Configure the cell...

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as UITableViewCell;

    let item = runes[indexPath.section][indexPath.row]
    cell.imageView?.image = item.runeImage
    cell.textLabel?.text = item.runeName
    cell.accessoryType = UITableViewCellAccessoryType.disclosureIndicator

    return cell
}

func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {

    return String(describing: runeTitle[section][0])
}

var clickedIndex = 0
var section = 0

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.clickedIndex = indexPath.row
    self.section =  indexPath.section

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "segue" {

        let runeArray = runes[section][clickedIndex]
        let destinationVC = segue.destination as! SecondViewController
        destinationVC.selectedRune = runeArray
    }
}

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

    }

}

第二 View Controller :

import UIKit

class SecondViewController: UIViewController {

    var selectedRune: Rune!

    @IBOutlet weak var runeNameLabel: UILabel!
    @IBOutlet weak var runeImage: UIImageView!
    @IBOutlet weak var runeDescriptionLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        runeNameLabel.text = selectedRune.runeName
        runeImage.image = selectedRune.runeImage
        runeDescriptionLabel.text = selectedRune.runeDescription
    }

}

Answer 1

你有这个

    func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return runes.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return runes[section].count
    }

因此，除了获取 indexPath.row 之外，您还需要获取当前选定的部分。例如，

self.clickedIndex = indexPath.row 
self.section = indexPath.section

然后您选择的 runArray 将是

let runeArray = runes[section][clickedIndex]

更新

您的问题是 prepare:forSegue 在 tableview:didSelectRowAt 被调用之前被调用。您应该使用它们中的任何一个而不是两者。以下代码段显示了如何使用 navigationtroller.pushViewController 导航到另一个 View Controller 。

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

        section = indexPath.section
        clickedIndex = indexPath.row
        let runeArray = runes[section][clickedIndex]

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        guard let destinationVC = storyboard.instantiateViewController(withIdentifier: "SecondVC") as? SecondViewController else { return}
        destinationVC.selectedRune = runeArray
        navigationController?.pushViewController(destinationVC, animated: true)        
}

请记住将您的 Storyboard ID 设置为 SecondVC 或任何您想要的。