Ios 自定义单元格未在UITableView中显示数据未使用情节提要

所以我尝试构建没有故事板的应用程序。我创建了自定义的tableview单元格类，并尝试从数组中显示标题和图像。代码运行，甚至创建与数组编号相同但单元格为空的单元格。如果有人能看一下，那就太好了。谢谢

这是我的定制手机

class CoffeeCell: UITableViewCell {

let cellImage = UIImageView()
let cellTitalBackground = UIView()
let cellTital = UILabel()


override func awakeFromNib() {
    super.awakeFromNib()
    self.backgroundColor = #colorLiteral(red: 0.9324248433, green: 0.9268818498, blue: 0.9366856217, alpha: 1)
    self.layer.cornerRadius = 20
    self.addSubview(cellImage)
    self.addSubview(cellTitalBackground)
    self.addSubview(cellTital)
    setUpCellImage()
    setUpCellTitalBackground()
    setUpCellTital()
}

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

    // Configure the view for the selected state
}


func setUpCell(Coffee: Coffee) {
    self.cellImage.image = UIImage(named: Coffee.image)
    self.cellTital.text = Coffee.tital

下面是表视图的视图控制器代码

import UIKit

class CoffeeVC: UIViewController, UITableViewDelegate, UITableViewDataSource {


let logoImage = UIImage(named: "DIYCoffeeLogoDark")
let logoImageView = UIImageView()
let pageHeader = UILabel()
let coffeeTableView = UITableView()


override func viewDidLoad() {
    super.viewDidLoad()
    coffeeTableView.dataSource = self
    coffeeTableView.delegate = self
    view.addSubview(pageHeader)
    view.addSubview(coffeeTableView)

        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return DataService.instance.coffees.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if let cell = coffeeTableView.dequeueReusableCell(withIdentifier: "CoffeeCell", for: indexPath) as? CoffeeCell {
            let coffee = DataService.instance.getCoffee()[indexPath.row]
            cell.setUpCell(Coffee: coffee)
            print ("it works")
            return cell
        } else {
            return CoffeeCell()
        }

希望一切都有意义

这里添加了我的cell类的所有代码

import UIKit

class CoffeeCell: UITableViewCell {

let cellImage = UIImageView()
let cellTitalBackground = UIView()
let cellTital = UILabel()


override func awakeFromNib() {
    super.awakeFromNib()
    self.backgroundColor = #colorLiteral(red: 0.9324248433, green: 0.9268818498, blue: 0.9366856217, alpha: 1)
    self.layer.cornerRadius = 20
    self.addSubview(cellImage)
    self.addSubview(cellTitalBackground)
    self.addSubview(cellTital)
    setUpCellImage()
    setUpCellTitalBackground()
    setUpCellTital()
    layoutIfNeeded()
}

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

    // Configure the view for the selected state
}


func setUpCell(Coffee: Coffee) {
    self.cellImage.image = UIImage(named: Coffee.image)
    self.cellTital.text = Coffee.tital

}
func setUpCellImage() {
    cellImage.contentMode = .scaleAspectFill
    cellImage.translatesAutoresizingMaskIntoConstraints = false
    cellImage.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
    cellImage.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
    cellImage.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
    cellImage.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
    cellImage.clipsToBounds = true
}

func setUpCellTitalBackground() {
    cellTitalBackground.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 0.7847549229)
    cellTitalBackground.translatesAutoresizingMaskIntoConstraints = false
    cellTitalBackground.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
    cellTitalBackground.trailingAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
    cellTitalBackground.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
    cellTitalBackground.heightAnchor.constraint(equalToConstant: 40).isActive = true
    cellTitalBackground.layer.cornerRadius = 20
    cellTitalBackground.layer.maskedCorners = .layerMaxXMinYCorner
}

func setUpCellTital() {
    cellTital.textColor = .black
    cellTital.textAlignment = .center
    cellTital.font = UIFont(name: "Futura", size: 30)
    cellTital.adjustsFontSizeToFitWidth = true
    cellTital.translatesAutoresizingMaskIntoConstraints = false
    cellTital.leadingAnchor.constraint(equalTo: cellTitalBackground.leadingAnchor).isActive = true
    cellTital.bottomAnchor.constraint(equalTo: cellTitalBackground.bottomAnchor).isActive = true
    cellTital.trailingAnchor.constraint(equalTo: cellTitalBackground.trailingAnchor).isActive = true
    cellTital.topAnchor.constraint(equalTo: cellTitalBackground.topAnchor).isActive = true
}

---

}我相信你已经把合同安排好了。您还需要如下设置tableViewCells的高度：

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 50 // whatever you want
    }

---

请按如下方式更新您的代码。指定图像和标题时，图像和标题标签框似乎没有更新。所以，移动约束并将子视图添加到setUpCell方法

override func awakeFromNib() {
    super.awakeFromNib()
    self.backgroundColor = #colorLiteral(red: 0.9324248433, green: 0.9268818498, blue: 0.9366856217, alpha: 1)
    self.layer.cornerRadius = 20

}

func setUpCell(Coffee: Coffee) {
    self.addSubview(cellImage)
    self.addSubview(cellTitalBackground)
    self.addSubview(cellTital)
    setUpCellImage()
    setUpCellTitalBackground()
    setUpCellTital()
    self.cellImage.image = UIImage(named: Coffee.image)
    self.cellTital.text = Coffee.title

}

输出：-

---

您必须检查为图像和标签正确设置的约束，并查看结果。

当UITableViewCell实例为空时，您没有创建它

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = coffeeTableView.dequeueReusableCell(withIdentifier: "CoffeeCell", for: indexPath) as? CoffeeCell
    if cell == nil {
       cell = CoffeeCell(style: .default, reuseIdentifier: "CoffeeCell")
    } 
    cell?.setUpCell(Coffee: coffee)
    return cell!

您可以使用标识符来重用单元，但对于开始，单元为nil，从未创建过，因此必须在单元为nil时创建

这是我的定制手机，它运行得很好

---

感谢您的投入和帮助

有另一个外观和原因在自定义单元格中不起作用，我重写了awakeFromNib（）函数，但因为我没有使用故事板，所以我需要使用如下所示的init函数

override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    setUpView()
}

required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

---

抱歉，这是一个愚蠢的错误，再次感谢。

谢谢。是的，我输入了一个150的单元格高度，单元格显示在正确的高度，但缺少图像和标签。是的，因为您没有注册单元格。在cellForRow方法中，每次都创建新的单元格。可能是因为您没有为图像和标签设置正确的约束。很抱歉，我在这里发布的代码中遗漏了这一点，但是的，我已经做到了。为了检查cellForRowAt（）代码的哪一部分正在运行而输入的print语句也会打印到控制台。但是由于某些原因，不能显示图像或标签。您必须为图像和标签设置边框大小。请共享CoffeeCell类的完整代码。谢谢。是的，我刚刚用所有代码更新了帖子