Question

我在使cellForRowAt工作时遇到问题，但不幸的是我的应用程序在编译后仍然是空白的。我正在使用Xcode 8.3 beta 3。

import UIKit

class myCell: UITableViewCell {

  @IBOutlet var myLabel: UILabel!
  @IBOutlet var myImageView: UIImageView!
  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
  }
}

我创建了一个Food类来简化工作：

import Foundation

class Food {
var imageName = ""
var description = ""
var moreInfo = ""

init(imageName: String, description: String, moreInfo: String) {
    self.imageName = imageName
    self.description = description
    self.moreInfo = moreInfo
  }
}

最后，这是TableViewController：

import UIKit

class TableViewController: UITableViewController {

    var foodArray: [Food] = [Food]()

    override func viewDidLoad() {
        super.viewDidLoad()

        let food1 = Food(imageName: "cake.jpg", description: "Chocolate Cake", moreInfo: "There is nothing better than a great chocolate cake.")
        let food2 = Food(imageName: "meringue.jpg", description: "Meringue & Berries", moreInfo: "I really don't like meringue but it's a nice photo.")
        let food3 = Food(imageName: "peaches.jpg", description: "Grilled Peaches", moreInfo: "This would be perfect as a summer time dessert.")
        let food4 = Food(imageName: "tiramisu.jpg", description: "Tiramisu", moreInfo: "One of my favorite Italian desserts. Yum.")

        foodArray.append(food1)
        foodArray.append(food2)
        foodArray.append(food3)
        foodArray.append(food4)

    }

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



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

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


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! myCell
        let foodItem = foodArray[indexPath.row]
        cell.myImageView.image = UIImage(named: foodItem.imageName)
        cell.myLabel.text = foodItem.description
        self.tableView.reloadData()
        return cell
    }
}

有谁能告诉我我做错了什么？

Answer 1

您不应在self.tableView.reloadData() func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell

内拨打self.tableView.reloadData()

替换此代码的viewDidLoad方法

override func viewDidLoad() {
    super.viewDidLoad()

    let food1 = Food(imageName: "cake.jpg", description: "Chocolate Cake", moreInfo: "There is nothing better than a great chocolate cake.")
    let food2 = Food(imageName: "meringue.jpg", description: "Meringue & Berries", moreInfo: "I really don't like meringue but it's a nice photo.")
    let food3 = Food(imageName: "peaches.jpg", description: "Grilled Peaches", moreInfo: "This would be perfect as a summer time dessert.")
    let food4 = Food(imageName: "tiramisu.jpg", description: "Tiramisu", moreInfo: "One of my favorite Italian desserts. Yum.")

    foodArray.append(food1)
    foodArray.append(food2)
    foodArray.append(food3)
    foodArray.append(food4)
}

并将此代码用于func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell代码

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! myCell
    let foodItem = foodArray[indexPath.row]
    cell.myImageView.image = UIImage(named: foodItem.imageName)
    cell.myLabel.text = foodItem.description
    return cell
  }

我希望这有助于你

Answer 2

您需要注册该类并使用以下方法添加重用标识符：

tableView.registerClass（UITableViewCell.self，forCellReuseIdentifier：“Cell”）

在viewDidLoad

中添加此方法

此外，您不需要在cellForRowAtIndexPath方法中调用self.tableView.reloadData（）。

希望有所帮助

Answer 3

问题是您正在调用reloadData()以便解决此问题，请将其从代码中删除：

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! myCell
    let foodItem = foodArray[indexPath.row]
    cell.myImageView.image = UIImage(named: foodItem.imageName)
    cell.myLabel.text = foodItem.description

    return cell
}

Swift cellForRow没有显示

3 个答案: