为什么我的 tableViewController 没有加载任何数据？

Question

我正在创建一个应用程序，其中 ViewController 中的不同按钮将不同的菜单加载到 tableViewController 中。按钮由准备转场链接，菜单（数组）由 contentMode 链接。 1：早餐菜单和 2：午餐菜单。我得到了设置它的人的帮助，但现在表格没有加载任何数据......该单元格有 3 个标签，显示项目、信息和价格。选择ContentMode时，它会在代码中更改值。有人在我的代码中看到问题吗？非常感谢！

import UIKit

class foodMenuController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let foodMenuController = segue.destinationViewController as! foodTableViewController

  if segue.identifier == "showBreakfast" {
            foodMenuController.contentMode = 1
    } else if segue.identifier == "showLunch" {
        foodMenuController.contentMode = 2
        }
    }


}

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

---

import UIKit

class foodTableViewCell: UITableViewCell {

@IBOutlet weak var foodItem: UILabel!
@IBOutlet weak var foodDescription: UILabel!
@IBOutlet weak var foodPrice: UILabel!

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
}

override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
}

}

---

import UIKit

class foodTableViewController: UITableViewController {

//Content Mode Selection in menu
var contentMode = 0

// THIS SHOULD BE LOADED WHEN CONTENT MODE is "1" --> BREAKFAST
let breakfastItems = ["Bread", "Coffee", "Nada"]
let breakfastInfo = ["Good", "Nice", "Nothing"]
let breakfastPrice = ["$1", "$100", "$12,40"]

// THIS SHOULD BE LOADED WHEN CONTENT MODE IS "2" --> LUNCH
let lunchItems = ["Not bread", "Not Coffee", "Something"]
let lunchInfo = ["Not good", "Not nice", "Yes"]
let lunchPrice = ["$1", "$100", "$12,40"]

var foodItems: [String] = []
var foodInfo: [String] = []
var foodPrice: [String] = []

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

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(true)
    switch (contentMode){
    case 1: contentMode = 1
        foodItems = breakfastItems
        foodInfo = breakfastInfo
        foodPrice = breakfastPrice
    case 2: contentMode = 2
        foodItems = lunchItems
        foodInfo = lunchInfo
        foodPrice = lunchPrice
    default:
        break
    }
    tableView.reloadData()
}


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

}

// Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
    }

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

}


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

    let cellIdentifier = "Cell"
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! foodTableViewCell

    cell.foodItem.text = foodItems[indexPath.row]
    cell.foodDescription.text = foodInfo[indexPath.row]
    cell.foodPrice.text = foodPrice[indexPath.row]

        return cell


    }
}

---

Answer 1

您共享的 sn-p 没有任何明显错误。您可以检查 tableView:numberOfRowsInSection: 方法中返回的内容，看看它是否返回值 > 0

另外，这是给定的，但我们都在某个时间点完成了 - 检查以确保 tableview 委托和数据源设置为您的视图控制器。

Answer 2

我对您的项目进行了轻微修改。 1. 将UINavigationController 设为InitialViewController 2.使FoodMenuController成为UINavigationController的根

现在修改你的FoodMenuController

@IBOutlet weak var bakeryButton: UIButton!
@IBOutlet weak var breakfastButton: UIButton!
override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.navigationBarHidden = true //hide navigationBar in first ViewController
    self.bakeryButton.addTarget(self, action: "bakeryButtonAction:", forControlEvents: .TouchUpInside)
    self.breakfastButton.addTarget(self, action: "breakfastButtonAction:", forControlEvents: .TouchUpInside)
}

func bakeryButtonAction(sender: UIButton) {
    performSegueWithIdentifier("showLunch", sender: self)
}

func breakfastButtonAction(sender: UIButton) {
    performSegueWithIdentifier("showBreakfast", sender: self)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let foodTableViewController: FoodTableViewController = segue.destinationViewController as! FoodTableViewController

    if segue.identifier == "showBreakfast" {
        foodTableViewController.contentMode = 1
    } else if segue.identifier == "showLunch" {
        foodTableViewController.contentMode = 2
    }
}

您还可以使UINavigationBar 在FoodTableViewController 中可见

    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationController?.navigationBarHidden = false
    }

PS：最好不要直接将 segue 添加到 UIButton。或者，您可以从FoodMenuController 顶部的黄色按钮添加它，并使用performSegueWithIdentifier 指定要在UIButtonAction 中触发的segue

Answer 3

我在哪里看不到你设置 tableView 的数据源和委托，请交叉检查这些都是设置。