如何从uitaiteView数据(UIIMAGE和String)提取到另一个ViewController

Question

我想传递TableView中包含的存储数据，然后将其传递给另一个ViewController。我的Customcell有一个UIIMAGE和一个字符串。当用户按单元格时，我想用uiimage显示一个"详细视图控制器"，并显示包含所选单元格信息的标签。

这是我的代码：

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var dataTableView: UITableView!
var myList = [dataList]()
var textToBeSent: String = ""
var selectedImage: UIImage?
var selectedLabel: String?
//Load Items To List
func loaditems(){
    let item1 = dataList(photoList: UIImage.self(), itemDescription: "Descripcion Aqui")
    let item2 = dataList(photoList: UIImage.self(), itemDescription: "Aqui tmb")
    myList += [item1,item2]
}
//var list = ["Documento 1", "Documento 2", "Documento 3"]
override func viewDidLoad() {
    super.viewDidLoad()
    if let savedData = loadSavedItems(){
        myList += savedData
    } else {
    loaditems()
    }

    //dataTableView.register(UITableViewCell.self, forCellReuseIdentifier: "reusablecell")

    // Do any additional setup after loading the view, typically from a nib.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
    return myList.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "prototype", for: indexPath) as! PrototypeCell
    let itemsinCell = myList[indexPath.row]
    cell.imageItem.image = itemsinCell.photoList
    cell.itemDescription.text = String(itemsinCell.itemDescription)
    return cell
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete{
        myList.remove(at: indexPath.row)
        dataTableView.reloadData()
    }
    saveToSavedData()
}

这是我要传递某个单元格的数据的功能。数据来自使用AdeCoder NScoder存储在"数据库"中的Swift文件。

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

    print("Row (indexPath.row) selected")
    selectedImage! = myList[indexPath.row].photoList
    selectedLabel! = myList[indexPath.row].itemdescription
    performSegue(withIdentifier: "selectedRowSegue", sender: myList[indexPath.row])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if(segue.identifier == "selectedRowSegue"){
        let chosenRowViewController = segue.destination as! chosenRowViewController
        chosenRowViewController.image3 = selectedImage?.photoList
        chosenRowViewController.label3 = selectedLabel?.itemDescription
    }
}

放开一个segue，以便用以前的数据填充细胞ViewController：

//Unwinde Segue
@IBAction func unWindlToList(sender: UIStoryboardSegue){
    if let sourceViewController = sender.source as? ProcessViewController, let item = sourceViewController.item{
        let newIndexPath = IndexPath(row: myList.count, section: 0)
        myList.append(item)
        dataTableView.insertRows(at: [newIndexPath], with: .automatic)
    }
    saveToSavedData()
}
//Archive Data
func saveToSavedData(){
    NSKeyedArchiver.archiveRootObject(myList, toFile: (dataList.fileFolder?.path)!)
}
//Unarchive Data
func loadSavedItems() -> [dataList]?{
    return NSKeyedUnarchiver.unarchiveObject(withFile: (dataList.fileFolder?.path)!) as? [dataList]
}
}
class PrototypeCell: UITableViewCell {
    @IBOutlet weak var itemDescription: UILabel!
    @IBOutlet weak var imageItem: UIImageView!
}

Answer 1

只需将prepare(for segue: UIStoryboardSegue, sender: Any?)函数替换为以下代码

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if(segue.identifier == "selectedRowSegue"), let list = sender as? dataList {
            let chosenRowViewController = segue.destination as! chosenRowViewController
            chosenRowViewController.image3 = list.photoList
            chosenRowViewController.label3 = list.itemDescription 
        }
    }

Answer 2

有几种突出的事情。

1- var myList = [dataList]()数据师是Class，应该大写。它应该是var myList = [DataList]()

2-您将其作为类属性，但是它在您发布的代码中没有使用它，所以您为什么添加它？它的目的是什么？var textToBeSent: String = ""

3-您有这两个类属性变量

var selectedImage: UIImage?
var selectedLabel: String?

保存来自[myList]的数据，但您确实不需要它们，因为您可以在prepareForSegue中使用dot notation从[myList]访问数据(在Preparforsegue中阅读评论的代码(。

4-在Preparforsegue中，您有let chosenRowViewController = segue.destination as! chosenRowViewController。ChosenRowViewController是一类，应该像这样大写：

let chosenRowViewController = segue.destination as! ChosenRowViewController // it's capitalized after the as!

这是清理的代码。

@IBOutlet weak var dataTableView: UITableView!
var myList = [DataList]()
func loaditems(){
    let item1 = dataList(photoList: UIImage.self(), itemDescription: "Descripcion Aqui")
    let item2 = dataList(photoList: UIImage.self(), itemDescription: "Aqui tmb")
    myList.append(item1)
    myList.append(item2)
}
override func viewDidLoad() {
    super.viewDidLoad()
    // everything you already have inside here...
}
// your tableView datasource methods...

5-由于您使用prepareForSegue，您不需要didSelectRowAt indexPath

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if(segue.identifier == "selectedRowSegue"){
        // get the indexPath for the selectedRow
        let indexPath = tableView.indexPathForSelectedRow
        let chosenRowViewController = segue.destination as! ChosenRowViewController
        chosenRowViewController.image3 = myList[indexPath!.row].photoList // use dot notation to access the photoList property
        chosenRowViewController.label3 = myList[indexPath!.row].itemDescription  // use dot notation to access the itemDescription property
    }
}

Answer 3

您在didSelectRowAt中犯了一个错误，在调用performSegue时，您必须通过sender的控制器，如果您的当前UIVIewController，则必须将self作为当前发件人控制器。因此，您所校正后的Methog看起来像在代码片段下：

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

    print("Row (indexPath.row) selected")
    selectedImage! = myList[indexPath.row].photoList
    selectedLabel! = myList[indexPath.row]
    performSegue(withIdentifier: "selectedRowSegue", sender: self)
}