我有一个关于将索引 (myIndex) 从 TableView 传递到另一个 ViewController 的问题。 我已经发布了下面的代码。好消息:当我运行代码时，索引会传递给另一个 View Controller 。坏消息:这不是我预期的指数。 (当我使用 TableView 在 Viewcontroller 中打印出 myindex 时，一切正常。如果我将 myIndex 传递给另一个 ViewController，则索引会混合在一起......
目标:我的 TableView 由 18 行组成(每个孔一行)。当我单击一行时，将打开另一个 View Controller 。在此 VieController 中，所选行的名称应显示在顶部。 我的想法是将每行的索引传递给另一个 View Controller ，但这无法正常工作。
有人可以帮我吗？
import UIKit
var holes = ["Hole 1","Hole 2","Hole 3","Hole 4","Hole 5","Hole 6","Hole 7","Hole 8", "Hole 9","Hole 10","Hole 11","Hole 12","Hole 13","Hole 14","Hole 15","Hole 16","Hole 17","Hole 18"]
var myIndex = 0
class OverViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
// Label
@IBOutlet weak var BackButton: UIButton!
@IBOutlet weak var ScoreButton: UIButton!
@IBOutlet weak var OverviewLabel: UILabel!
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func BackToStartScreen(_ sender: UIButton) {
performSegue(withIdentifier: "BackToStart", sender: self)
}
@IBAction func GoToResultScreen(_ sender: UIButton) {
performSegue(withIdentifier: "GoToResult", sender: self)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return holes.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = holes[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
myIndex = indexPath.row
performSegue(withIdentifier: "GoToScore", sender: self)
}
}
和 ScoreViewController:
import UIKit
class ScoreViewController: UIViewController {
var score = 0
var fairwayhits = 0
var greeninregulation = 0
var putts = 0
var text = ""
// Variable Deklaration
var CurrentScore = 0
var CurrentFairwayHits = 0
var CurrentGreenInRegulations = 0
var CurrentPutts = 0
// Bar Label
@IBOutlet weak var BackLabel: UIButton!
@IBOutlet weak var TitleLabel: UILabel!
// Score Elements
@IBOutlet var ScoreLabel: UILabel!
@IBOutlet var ScoreStepper: UIStepper!
@IBOutlet var ScoreResultLabel: UILabel!
@IBOutlet var ScoreFrameLabel: UILabel!
// Fairway Elements
@IBOutlet var FairwayLabel: UILabel!
@IBOutlet var FairwaySwitch: UISwitch!
@IBOutlet var FairwayResultLabel: UILabel!
@IBOutlet var FairwayFrameLabel: UILabel!
// Green Elements
@IBOutlet var GreenLabel: UILabel!
@IBOutlet var GreenSwitch: UISwitch!
@IBOutlet var GreenResultLabel: UILabel!
@IBOutlet var GreenFrameLabel: UILabel!
// Putt Elements
@IBOutlet var PuttLabel: UILabel!
@IBOutlet var PuttStepper: UIStepper!
@IBOutlet var PuttResultLabel: UILabel!
@IBOutlet var PuttFrameLabel: UILabel!
// Save Button
@IBOutlet var SaveButton: UIButton!
// Back Button
@IBAction func BackButtonPressed(_ sender: UIButton) {
performSegue(withIdentifier: "BackToOverview", sender: self)
}
// Score Stepper
@IBAction func ScoreStepperPressed(_ sender: UIStepper) {
ScoreResultLabel.text = Int(sender.value).description
}
// Fairway Switch
@IBAction func FairwaySwitchPressed(_ sender: UISwitch) {
if FairwaySwitch.isOn {
CurrentFairwayHits = 1
FairwayResultLabel.text = "X"
} else {
CurrentFairwayHits = 0
FairwayResultLabel.text = "-"
}
}
// Green Switch
@IBAction func GreenSwitchPressed(_ sender: UISwitch) {
if GreenSwitch.isOn {
CurrentGreenInRegulations = 1
GreenResultLabel.text = "X"
} else {
CurrentGreenInRegulations = 0
GreenResultLabel.text = "-"
}
}
// Putt Stepper
@IBAction func PuttStepperPressed(_ sender: UIStepper) {
PuttResultLabel.text = Int(sender.value).description
}
// Save Button
@IBAction func SaveButtonPressed(_ sender: UIButton) {
if Int(PuttResultLabel.text!)! >= Int(ScoreResultLabel.text!)! {
showAlert()
} else {
score = score + Int(ScoreResultLabel.text!)!
fairwayhits = fairwayhits + CurrentFairwayHits
greeninregulation = greeninregulation + CurrentGreenInRegulations
putts = putts + Int(PuttResultLabel.text!)!
print(score)
print(fairwayhits)
print(greeninregulation)
print(putts)
performSegue(withIdentifier: "ShowResult", sender: self)
}
}
func showAlert() {
let alert = UIAlertController(title: "Ops, something went wrong", message: "The number of putts must be smaller than your score!", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: { action in print("tapped Dismissed")}))
present(alert, animated: true)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if SaveButton.isTouchInside,
let resultVC = segue.destination as? ResultViewController
{
CurrentScore = score /// get the current cell's text
CurrentPutts = putts
resultVC.score = resultVC.score + String((resultVC.ScoreResultLabel.text!))
resultVC.fairway = String(fairwayhits)
resultVC.green = String(greeninregulation)
resultVC.putt = String(putts)
}
}
override func viewDidLoad() {
super.viewDidLoad()
ScoreStepper.wraps = true
ScoreStepper.autorepeat = true
ScoreStepper.minimumValue = 1
ScoreStepper.maximumValue = 20
PuttStepper.wraps = true
PuttStepper.autorepeat = true
PuttStepper.minimumValue = 0
PuttStepper.maximumValue = 20
TitleLabel.text = text
}
}
结果 View Controller :
class ResultViewController: UIViewController {
var score = ""
var fairway = ""
var green = ""
var putt = ""
@IBOutlet weak var TitleLabel: UILabel!
@IBOutlet weak var BackButton: UIButton!
@IBOutlet weak var ShareButton: UIButton!
// Score Label
@IBOutlet weak var ScoreLabel: UILabel!
@IBOutlet weak var ScoreResultLabel: UILabel!
@IBOutlet weak var ScoreFrameLabel: UILabel!
// Fairway Label
@IBOutlet weak var FairwayLabel: UILabel!
@IBOutlet weak var FairwayResultLabel: UILabel!
@IBOutlet weak var FairwayFrameLabel: UILabel!
// Green Label
@IBOutlet weak var GreenLabel: UILabel!
@IBOutlet weak var GreenResultLabel: UILabel!
@IBOutlet weak var GreenFrameLabel: UILabel!
// Putt Label
@IBOutlet weak var PuttLabel: UILabel!
@IBOutlet weak var PuttResultLabel: UILabel!
@IBOutlet weak var PuttFrameLabel: UILabel!
// Back Button Action
@IBAction func BackButtonPressed(_ sender: UIButton) {
performSegue(withIdentifier: "BackToOverview", sender: self)
}
override func viewDidLoad() {
super.viewDidLoad()
ScoreResultLabel.text = "\(score)"
FairwayResultLabel.text = "\(fairway)"
GreenResultLabel.text = "\(green)"
PuttResultLabel.text = "\(putt)"
}
}
最佳答案
第一件事:你不想在类之外有变量。当然，您可以从所有类(class)访问它们。但是，这不是一个好的做法，您会遇到状态错误。
所以，替换
var holes = ["Hole 1","Hole 2","Hole 3","Hole 4","Hole 5","Hole 6","Hole 7","Hole 8", "Hole 9","Hole 10","Hole 11","Hole 12","Hole 13","Hole 14","Hole 15","Hole 16","Hole 17","Hole 18"]
var myIndex = 0
class OverViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
与
class OverViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var holes = ["Hole 1","Hole 2","Hole 3","Hole 4","Hole 5","Hole 6","Hole 7","Hole 8", "Hole 9","Hole 10","Hole 11","Hole 12","Hole 13","Hole 14","Hole 15","Hole 16","Hole 17","Hole 18"]
var myIndex = 0
并且还替换
var score = 0
var fairwayhits = 0
var greeninregulation = 0
var putts = 0
var text = ""
class ScoreViewController: UIViewController {
与
class ScoreViewController: UIViewController {
var score = 0
var fairwayhits = 0
var greeninregulation = 0
var putts = 0
var text = ""
现在，我假设您想要这种行为:
- 按表格 View 上的单元格
- 呈现显示单元格文本的
ScoreViewController
您可以将其放入您的 prepareForSegue 函数中:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let selectedPath = tableView.indexPathForSelectedRow else { return }
if
segue.identifier == "GoToScore",
let scoreVC = segue.destination as? ScoreViewController
{
let currentText = holes[selectedPath.row] /// get the current cell's text
scoreVC.text = currentText
}
}
编辑:然后，您可以将 TitleLabel.text 设置为 viewDidLoad 内的 text 属性，如下所示:
class ScoreViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
TitleLabel.text = text /// right here!
}
}
您还应该将所有属性(包括 TitleLabel 等 socket )保留为小写。这只是一种约定，可以让其他人更轻松地阅读您的代码。
@IBOutlet weak var backLabel: UIButton!
@IBOutlet weak var titleLabel: UILabel!
请记住，要更改 socket 的名称，您需要断开链接并从 Storyboard 重新链接它。
关于swift - 将选定行的索引传递给另一个 ViewController，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/66054268/