如何连接到 tableview 容器？

Posted 2023-02-27

【中文标题】如何连接到 tableview 容器？

【英文标题】：How to connect to tableview containers?

【发布时间】：2018-03-27 07:23:33

【问题描述】：

我是 Xcode 和 Swift 的初学者，我目前正在创建一个应用程序，用户在应用程序中添加一个人，然后纠正他们欠该人或该人欠他/她的金额。

注意：我已经使用核心数据来存储所有值

我有一个名为 PeopleTableViewController 的 ViewController，用户在其中添加了他们欠的人的姓名。然后我有 PersonDetailTableViewController，它显示了用户欠在 PeopleTableViewController 中选择的特定人的详细信息列表。我面临的问题是，如果我在 PeopleTableViewController 中添加三个人，当我选择其中任何一个人时，我会被定向到 PersonDetailTableViewController 中的同一个表格视图，但我希望用户在 PeopleTableViewController 中选择的不同人有不同的表格视图。

PersonDetailTableViewController：

import UIKit

class PersonDetailTableViewController: UITableViewController 

    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext


    var totalLabel: UILabel?
    var person: People?
    var owe: Owe?

    @IBOutlet var personTable: UITableView!

    var dataInfo: [Owe] = []
    var selectedObject: [Owe] = []
    var balanceAmount = "Balance: "

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        return (dataInfo.count)
    

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
        let cell = personTable
            .dequeueReusableCell(withIdentifier: "detailsCell", for: indexPath)
        cell.textLabel?.text = dataInfo[indexPath.row].name
        cell.detailTextLabel?.text = "₹ \(dataInfo[indexPath.row].amount)"
//        if dataInfo[indexPath.row].amount < 0 
//            cell.detailTextLabel?.textColor = UIColor.red
//         else 
//            cell.detailTextLabel?.textColor = UIColor.green
//        
        return cell
    

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
        selectedObject = [dataInfo[indexPath.row]]
        performSegue(withIdentifier: "addOweDetails", sender: nil)
        tableView.deselectRow(at: indexPath, animated: true)
    

    override func viewDidLoad() 
        super.viewDidLoad()

        getData()
        personTable.dataSource = self
        addTotalToNav()
        print(dataInfo as Any)
    



    // MARK: - Table view data source

    func addTotalToNav() -> Void 
        if let navigationBar = self.navigationController?.navigationBar 
            let totalFrame = CGRect(x: 10, y: 0, width: navigationBar.frame.width/2, height: navigationBar.frame.height)

            totalLabel = UILabel(frame: totalFrame)
            totalLabel?.text = balanceAmount
            totalLabel?.tag = 1
            totalLabel?.font = UIFont.boldSystemFont(ofSize: 14)
            totalLabel?.textColor = UIColor.red
//            navigationBar.large = totalLabel?.text
            self.title = totalLabel?.text

        
    


    func getData() -> Void 
        do
            dataInfo = try context.fetch(Owe.fetchRequest())
            var total:Double = 0.00
            for i in 0 ..< dataInfo.count 
                total += dataInfo[i].amount as! Double
            
            balanceAmount = "Balance: ₹" + (NSString(format: "%.2f", total as CVarArg) as String)
        
        catch
            print("Fetching Failed")
        
    

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
        let vc = segue.destination as! NewOweTableViewController
        vc.dataInfo = selectedObject
        selectedObject.removeAll()

    

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

    override func viewWillAppear(_ animated: Bool) 
        super.viewWillAppear(animated)
        getData()
        personTable.reloadData()
        if (self.navigationController?.navigationBar.viewWithTag(1)?.isHidden == true)
            self.navigationController?.navigationBar.viewWithTag(1)?.removeFromSuperview()
            addTotalToNav()
        
    

PeopleTableViewController：

import UIKit
import CoreData

class PeopleTableViewController: UITableViewController 

    @IBOutlet weak var peopleTableView: UITableView!

    var people: [People] = []

    override func viewDidLoad() 
        super.viewDidLoad()

        peopleTableView.separatorStyle = .none

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem
    

    //ViewWillAppear allows us to fetch all the data in the backend and help us display to the user
    override func viewWillAppear(_ animated: Bool) 
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else 
            return
        

        let managedContext = appDelegate.persistentContainer.viewContext

        let fetchRequest: NSFetchRequest<People> =  People.fetchRequest()

        do 
            people = try managedContext.fetch(fetchRequest)

            peopleTableView.reloadData()
         catch 
            print("Could not fetch")
        
    

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


    @IBAction func addButtonPressed(_ sender: UIBarButtonItem) 
    

    //Following function is called right before the user segues from one viewcontroller to another viewcontroller

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
        guard let destination = segue.destination as? PersonDetailTableViewController,
           let selectedRow = self.peopleTableView.indexPathForSelectedRow?.row else 
            return
        

        destination.person = people[selectedRow]
//        destination.owe = people[selectedRow]

    

    func deletePerson(at indexPath: IndexPath) 
        let person = people[indexPath.row]

        guard let managedContext = person.managedObjectContext else 
            return
        

        managedContext.delete(person)

        do 
            try managedContext.save()

            people.remove(at: indexPath.row)

            peopleTableView.deleteRows(at: [indexPath], with: .automatic)
         catch 
            print("Could not delete")

            peopleTableView.reloadRows(at: [indexPath], with: .automatic)
        
    


extension PeopleTableViewController

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        return people.count
    

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

        let cell = peopleTableView.dequeueReusableCell(withIdentifier: "peopleCell", for: indexPath)

        let person = people[indexPath.row]

        cell.textLabel?.text = person.title

        return cell
    

    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) 
        if editingStyle == .delete 
            deletePerson(at: indexPath)
        
    

以下图片显示了我的确切要求：

PeopleTableViewController

PeopleTableViewController

点击 Mike 我得到以下信息：

PersonDetailTableViewController

点击 John 我得到以下信息：

PersonDetailTableViewController

我希望 Mike 和 John 的记录应该与 PersonDetailTableViewController 上的记录不同。

【参考方案1】：

你可以试试（都在PeopleTableViewController），创建一个名为shoePersonDetails的segue，从PeopleTableViewController到PersonDetailTableViewController

 override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
    let person = people[indexPath.row]
    performSegue(withIdentifier: "shoePersonDetails", sender: person)
    tableView.deselectRow(at: indexPath, animated: true)

//

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
    let vc = segue.destination as! PersonDetailTableViewController
    vc.dataInfo = sender as! People

【讨论】：

嗨 Sh_Khan，感谢您的回答，但它在 let vc = segue.destination 时给出“线程 1：信号 SIGABRT”错误！ NewOweTableViewController。以下是错误：无法将“Draft3.PersonDetailTableViewController”（0x10a943c48）类型的值转换为“Draft3.NewOweTableViewController”（0x10a943958）。 2018-03-27 22:06:52.780804+0530 Draft3 [71618:3274381] 无法将“Draft3.PersonDetailTableViewController”（0x10a943c48）类型的值转换为“Draft3.NewOweTableViewController”（0x10a943958）。

另外，覆盖 func prepare(for segue: UIStoryboardSegue, sender: Any?) let vc = segue.destination as! NewOweTableViewController vc.dataInfo = sender as！ Owe 这是给 PeopleViewController 的吗

查看编辑............，另外请澄清你想要什么或你想从哪里导航到什么????

它仍然无法正常工作，因为它给出了错误：无法将类型“人”的值分配给类型“[Owe]”

好的，现在很清楚了，当你说你点击 Mike 时，你会搜索 coredata 的数据吗？？？或者没有根据名称过滤，我在 peopleVC 中只看到一组人？？