如何在一个单元格中返回多个元素？

Question

我想返回一个单元格的多个元素。我该怎么做？这是我正在处理的代码

//
//  TableViewControllerCompiti.swift
//  Secondo B
//
//  Created by Edoardo on 23/12/15.
//  Copyright © 2015 ERC. All rights reserved.
//

import UIKit
import Parse

class TableViewControllerCompiti: UITableViewController {

var selfTable: NSMutableArray = NSMutableArray()

@IBOutlet var MessageTable: UITableView!
@IBOutlet weak var Compiti: UILabel!
@IBOutlet weak var DescrizioneCompiti: UITextView!
@IBOutlet weak var DataCompiti: UILabel!

var messagesArray: [String] = [String]()
var descriptionArray: [String] = [String]()
var dateArray: [String] = [String]()

override func viewDidLoad() {
    super.viewDidLoad()

    func retrieveMessages() {

        let query = PFQuery(className: "Compiti")

        query.findObjectsInBackgroundWithBlock {
            (remoteObjects: [PFObject]?, error: NSError?) -> Void in

            for messageObject in remoteObjects! {

                let messageText: String? = (messageObject as PFObject) ["Materia"] as? String
                let descriptionText: String? = (messageObject as PFObject) ["Compiti"] as? String
                let date: String? = (messageObject as PFObject) ["Data"] as? String

                if messageText != nil {

                    self.messagesArray.append(messageText!)

                }

                if descriptionText != nil {

                    self.descriptionArray.append(descriptionText!)

                }

                if date != nil {

                    self.dateArray.append(date!)

                }
            }

            self.MessageTable.reloadData()

        }
    }

    retrieveMessages()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    var cell = UITableViewCell?()
    cell = tableView.dequeueReusableCellWithIdentifier("cell")

    Compiti.text = self.messagesArray[indexPath.row]
    DataCompiti.text = self.dateArray[indexPath.row]
    DescrizioneCompiti.text = self.descriptionArray[indexPath.row]

    if cell == nil {
            cell = UITableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: "ReUseCell")
        }

    return cell!
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return self.messagesArray.count
    }
}

当我运行它时，模拟器只返回一堆空单元格。如何返回元素？

Answer 1

来自您的代码的备注：

• 你不能在 viewDidLoad() 内部实现和调用函数，你在生命周期之外实现所有函数/方法然后在里面调用。

• 我认为使用三个不同的数组来包含您的数据并不是一个好主意，您应该学习 struct 或 class 数据结构来对您的数据进行分组，因为您正在获取它们来自同一个班级。

  struct myDataContainer
  {
      var message:String?
      var descriptionText:String?
      var date:String?
  }
  
   var arrayOfContainers = [myDataContainer]()  //<-- this will be your new array
  

• 我看到你有一个自定义单元格，你想要有 2 个标签和 UITextView。你应该创建一个 UITableViewCell 的子类，然后将它们分组。

        class CustomizeCell :UITableViewCell
        {
              @IBOutlet weak var Compiti: UILabel!
              @IBOutlet weak var DescrizioneCompiti: UITextView!
               @IBOutlet weak var DataCompiti: UILabel!
  
        } //<--- Subclass of UITableViewCell above
  
  
        struct myDataContainer
          {
             var message:String?
             var descriptionText:String?
             var date:String?
          }
  
  class TableViewControllerCompiti: UITableViewController {
  
  
  
  var arrayOfContainers = [myDataContainer]()  //<-- this will be your new array
  
  
  override func viewDidLoad()
  {
      super.viewDidLoad()
      retrieveMessages()   //<--- call function
  }
  
  func retrieveMessages()
  {
      var objectT = myDataContainer()
      let query = PFQuery(className: "Compiti")
      query.findObjectsInBackgroundWithBlock {(objects: [PFObject]?, error: NSError?) -> Void in
  
          if let remoteObjects = objects
          {
              for messageObject in remoteObjects
              {
                  let messageText = messageObject["Materia"]  as? String
                  let description = messageObject["Compiti"]  as? String
                  let date        = messageObject["Data"]     as? String
  
                      objectT.message = messageText!
                      objectT.descriptionText = description!
                      objectT.date = date!
  
                      self.arrayOfContainers.append(objectT)
  
              }
              self.tableView.reloadData()
          }
      }
  }
  
  
  override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
  
      let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomizeCell
      // as! CustomizeCell technically speaking make sure that we access our customize cell
  
      let data = self.arrayOfContainers[indexPath.row]
      cell.Compiti.text = data.message
      cell.DataCompiti.text = data.descriptionText
      cell.DescrizioneCompiti.text = data.date
  
      return cell
  }
  
  override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
      return self.arrayOfContainers.count
       }
     }