如何創建電影表視圖？-有解無憂

我對 Swift 編程非常陌生，而且我越來越不喜歡它了。我不像其他語言那樣容易掌握它。

我有一個正在進行的專案，但我無法弄清楚哪里出了問題或為什么它不起作用。

在一個視圖中，我有一個包含單元格的表視圖。我正在使用一個陣列來存盤我想要存盤在表視圖中相應元素中的所有值。

當用戶單擊表格視圖中的單個單元格時，它將把他們帶到另一個顯示電影其他元素（運行時間、影像、導演和年份）的視圖。

我有一個用于撰寫此代碼的模板，我認為我已正確完成所有操作，但是當我運行該應用程式時，沒有任何顯示。

當我運行應用程式時，我只想在啟動時顯示表格單元格。如果我可以顯示表格單元格，我什至可以自行解決問題。

由于我對這種語言和 XCode 還很陌生，因此我無法在 IDE 中導航以查找我的問題。最重要的是，我已經在與 Swift 作斗爭了。

如果可能的話，我真的可以使用幫助！

這是我完成的所有代碼：

    import UIKit

    class ViewController: UIViewController,
    UITableViewDelegate,
    UITableViewDataSource  {
    
    let movieList = ["Step Brothers", "Pulp Fiction", "Ali", "Harry Potter"]
    let yearList = ["2008", "1994", "2001", "2001"]
    let images = ["step_brothers", "pulp_fiction", "ali", "harry_potter3"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return movieList.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let tempCell: TableViewCell = tableView.dequeueReusableCell(withIdentifier:         
                 "cell") as! TableViewCell
        
        tempCell.movieTitleLabel.text = movieList[indexPath.row]
        tempCell.movieYearLabel.text = yearList[indexPath.row]
        tempCell.movieImage.image = UIImage(named: images[indexPath.row]   ".jpeg")
        
        return tempCell
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        
        let detailVC:MovieDetailViewController = self.storyboard?.instantiateViewController(withIdentifier: "MovieDetailViewController") as! MovieDetailViewController
       // assign the values to the local variable declared in ProductDetailViewController Class
        detailVC.movieImage = UIImage(named: images[indexPath.row]   ".jpeg")!
      
        // make it navigate to ProductDetailViewController
        self.navigationController?.pushViewController(detailVC, animated: true)
     }  
    }

這是針對表視圖中的單個單元格：

import UIKit

class TableViewCell: UITableViewCell {

@IBOutlet weak var movieTitleLabel: UILabel!

@IBOutlet weak var movieYearLabel: UILabel!

@IBOutlet weak var movieImage: 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
 }
}

這是 MovieDetailViewController：

class MovieDetailViewController: UIViewController {

    @IBOutlet weak var movieDetailImage: UIImageView!
    
    @IBOutlet weak var runtimeLabel: UILabel!
    
    @IBOutlet weak var yearDetailLabel: UILabel!
    
    @IBOutlet weak var directorDetailLabel: UILabel!
    
    var runtime: String!  // holds the product name
    var year: String!  // holds the price
    var movieImage: UIImage! // holds the product image
    var director: String!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        movieDetailImage.image = movieImage
        runtimeLabel.text = runtime
        yearDetailLabel.text = year
        directorDetailLabel.text = director

        // Do any additional setup after loading the view.
    }
    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */
   }

這是終端中顯示的錯誤，但代碼中沒有實際錯誤：

2022-11-14 17:39:28.232645-0500 Exercise01[25678:1217794] [Storyboard] Unable to find method -[(null) TableViewCell] 2022-11-14 17:39:28.259975-0500 Exercise01[25678:1217794] [Assert] UINavigationBar decoded as unlocked for UINavigationController, or navigationBar delegate set up incorrectly. Inconsistent configuration may cause problems. navigationController=<UINavigationController: 0x141012400>, navigationBar=<UINavigationBar: 0x142106160; frame = (0 47; 0 50); opaque = NO; autoresize = W; layer = <CALayer: 0x600001d72280>> delegate=0x141012400

如果您需要，我可以加入 AppDelegate 和 SceneDelegate，請告訴我。

再次感謝大家！非常感謝您的幫助！

uj5u.com熱心網友回復：

我首先建議擺脫 Storyboards，它們容易出錯并且除錯很麻煩。

您的問題：我沒有看到您將 UITableView 連接到 ViewController（如果您使用故事板，則使用 IBOutlet）。您需要做的是為該 UITableView 設定 UITableViewDelegate 和 UITableViewDataSource

class ViewController: UIViewController,
UITableViewDelegate,
UITableViewDataSource  {

let movieList = ["Step Brothers", "Pulp Fiction", "Ali", "Harry Potter"]
let yearList = ["2008", "1994", "2001", "2001"]
let images = ["step_brothers", "pulp_fiction", "ali", "harry_potter3"]

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    
    tableView.delegate = self
    tableView.dataSource = self
}

uj5u.com熱心網友回復：

我試過你的代碼，我沒有得到任何錯誤，我希望你已經設定了表視圖的資料源和委托。只需將其添加到您的 viewDidLoad()

override func viewDidLoad() {
super.viewDidLoad()

  tableView.delegate = self
  tableView.dataSource = self
}

uj5u.com熱心網友回復：

我認為委托和資料源不是唯一的錯誤......這是一個示例（完整代碼），說明如何以編程方式執行此操作：

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

let movieList = ["Step Brothers", "Pulp Fiction", "Ali", "Harry Potter"]
    let yearList = ["2008", "1994", "2001", "2001"]
    let images = ["step_brothers", "pulp_fiction", "ali", "harry_potter3"]

let tableView = UITableView() // declare tableView

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white

        tableView.backgroundColor = .white
        tableView.translatesAutoresizingMaskIntoConstraints = false // disable defaults constrints
        // set delegate and datasource
        tableView.delegate = self
        tableView.dataSource = self
        tableView.register(TableViewCell.self, forCellReuseIdentifier: "cell") // register your cell
        
        view.addSubview(tableView)
        tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        tableView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
        tableView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
        tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return movieList.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let tempCell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell // get cellId and indexPath
        tempCell.movieTitleLabel.text = movieList[indexPath.row]
        tempCell.movieYearLabel.text = yearList[indexPath.row]
        tempCell.movieImage.image = UIImage(named: images[indexPath.row])
        
        return tempCell
    }
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 80 // height of single row
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath) as! TableViewCell // This is your cell in didSelectRow to obtain objects in there
    
    let detailVC = MovieDetailViewController()
    
    detailVC.movieImage = cell.movieImage.image ?? UIImage()
    detailVC.runtimeLabel.text = cell.movieTitleLabel.text
    detailVC.yearDetailLabel.text = cell.movieYearLabel.text
    
    navigationController?.pushViewController(detailVC, animated: true)
 }
}

這是你的手機：

class TableViewCell: UITableViewCell {

let movieTitleLabel = UILabel()
let movieYearLabel = UILabel()
let movieImage = UIImageView()

override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    contentView.backgroundColor = .white
    
    movieTitleLabel.textColor = .black
    movieYearLabel.textColor = .black
    
    movieTitleLabel.translatesAutoresizingMaskIntoConstraints = false
    movieYearLabel.translatesAutoresizingMaskIntoConstraints = false
    movieImage.translatesAutoresizingMaskIntoConstraints = false
               
    contentView.addSubview(movieImage)
    movieImage.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true
    movieImage.leadingAnchor.constraint(equalTo: contentView.leadingAnchor).isActive = true
    movieImage.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true
    movieImage.widthAnchor.constraint(equalTo: contentView.heightAnchor).isActive = true
    
    let stackView = UIStackView(arrangedSubviews: [movieTitleLabel, movieYearLabel])
    stackView.axis = .vertical
    stackView.distribution = .fillEqually
    stackView.translatesAutoresizingMaskIntoConstraints = false
    
    contentView.addSubview(stackView)
    stackView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
    stackView.leadingAnchor.constraint(equalTo: movieImage.trailingAnchor, constant: 10).isActive = true
    stackView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -10).isActive = true
    stackView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
}

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

這是你的 movieDetailController：

class MovieDetailViewController: UIViewController {

let movieDetailImage = UIImageView()
let runtimeLabel = UILabel()
let yearDetailLabel = UILabel()

let runtime = String()  // holds the product name
var year = String()  // holds the price
var movieImage = UIImage() // holds the product image

override func viewDidLoad() {
    super.viewDidLoad()
    
    view.backgroundColor = .white
    movieDetailImage.translatesAutoresizingMaskIntoConstraints = false
    runtimeLabel.translatesAutoresizingMaskIntoConstraints = false
    yearDetailLabel.translatesAutoresizingMaskIntoConstraints = false
    
    movieDetailImage.image = movieImage
    movieDetailImage.contentMode = .scaleAspectFill
    
    runtimeLabel.textColor = .black
    runtimeLabel.textAlignment = .center
    yearDetailLabel.textColor = .black
    yearDetailLabel.textAlignment = .center
    
    view.addSubview(movieDetailImage)
    movieDetailImage.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    movieDetailImage.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    movieDetailImage.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    movieDetailImage.heightAnchor.constraint(equalTo: movieDetailImage.widthAnchor).isActive = true
    
    let stackView = UIStackView(arrangedSubviews: [runtimeLabel, yearDetailLabel])
    stackView.axis = .vertical
    stackView.distribution = .fillEqually
    stackView.translatesAutoresizingMaskIntoConstraints = false
    
    view.addSubview(stackView)
    stackView.topAnchor.constraint(equalTo: movieDetailImage.bottomAnchor).isActive = true
    stackView.leadingAnchor.constraint(equalTo: movieDetailImage.leadingAnchor).isActive = true
    stackView.heightAnchor.constraint(equalToConstant: 60).isActive = true
    stackView.trailingAnchor.constraint(equalTo: movieDetailImage.trailingAnchor).isActive = true
 }
}

這就是結果（directorDetailLabel 沒有任何陣列）

如何創建電影表視圖？

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