Question

我仍然非常擅长编码，我正在创建一个菜谱应用程序，认为它应该相当简单。我已经研究了一段时间，并且能够通过youtube视频，关于udemy的课程，以及我在这里找到的一些代码和github，偶然发现它。我现在遇到了障碍，我找不到答案。

我输入了两个食谱，当我运行我的应用程序时，我正在尝试获取食谱名称以填充tableview，但它仍然是空白的。我知道这很可能是简单的事情，我已经尝试过所有事情。我觉得它出现在＆＃34; cell.textLabel？.text = recipe.name＆＃34;代码行，但我不确定。这是我到目前为止的代码

            //Test
            InboxFolder = outlookNs.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox);
            items = InboxFolder.Items;
            foreach (object mailitem in items)
            {
                olMail = mailitem as Outlook.MailItem;
                if (olMail != null)
                {
                    Outlook.UserProperty upK = olMail.UserProperties["Processed"];
                    if (upK != null)
                        upK.Delete();
                    olMail.Save();
                }
            }
            //Test

我的食谱文件看起来像这样

import UIKit

class tableVC: UITableViewController {

  var recipes: [AnyObject] = []

  override func viewDidLoad() {
    super.viewDidLoad()

    let recipe0: Recipe = Recipe()
    recipe0.name = "Number 1"
    recipe0.ingredients = ["Pasta","Pasta Sauce","Hamburger"]
    recipe0.directions = "Cook pasta to directions on box, brown hamburger, add sauce to hamburger, dump on pasta"

    let recipe1: Recipe = Recipe()
    recipe1.name = "Number 2"
    recipe1.ingredients = ["all kinds of stuff","Then a dash of salt"]
    recipe1.directions = "enjoy"
  }

  override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return recipes.count
  }

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

    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell

    let recipe: Recipe = recipes[indexPath.row] as! Recipe

    cell.textLabel?.text = recipe.name

    return cell
  }

  override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

  }
}

非常感谢任何帮助或指导。

Answer 1

您正在Recipe中创建一些viewDidLoad个对象，但实际上并未将它们添加到recipes数组中 -

override func viewDidLoad() {
    super.viewDidLoad()

    let recipe0: Recipe = Recipe()
    recipe0.name = "Number 1"
    recipe0.ingredients = ["Pasta","Pasta Sauce","Hamburger"]
    recipe0.directions = "Cook pasta to directions on box, brown hamburger, add sauce to hamburger, dump on pasta"

    let recipe1: Recipe = Recipe()
    recipe1.name = "Number 2"
    recipe1.ingredients = ["all kinds of stuff","Then a dash of salt"]
    recipe1.directions = "enjoy"

    self.recipies=[recipe0,recipe1]
}

Answer 2

像这样修改你的类，更改数组配方只保存Recipe对象，并在创建它们后添加它们。

import UIKit

class tableVC: UITableViewController {

var recipes: [Recipe] = []

override func viewDidLoad() {
    super.viewDidLoad()

let recipe0: Recipe = Recipe()
recipe0.name = "Number 1"
recipe0.ingredients = ["Pasta","Pasta Sauce","Hamburger"]
recipe0.directions = "Cook pasta to directions on box, brown hamburger, add sauce to hamburger, dump on pasta"
recipes.append(recipe0)

let recipe1: Recipe = Recipe()
recipe1.name = "Number 2"
recipe1.ingredients = ["all kinds of stuff","Then a dash of salt"]
recipe1.directions = "enjoy"
recipes.append(recipe1)

}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return recipes.count
}

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

    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell

    cell.textLabel?.text = recipes[indexPath.row].name

    return cell
  }

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

  }
}

Answer 3

有多种可能出错的可能性。最好检查的地方是数据源。

 let recipe: Recipe = recipes[indexPath.row] as! Recipe
 if(recipe.name)
  cell.textLabel?.text = recipe.name

Swift 2.无法获取UITableViewCell来填充

3 个答案: