以编程方式将按钮添加到 uitableview 单元格

Question

我只希望我的代码在每个 table 包含文本的视图单元格中生成一个按钮。当按下按钮时，只需让它打个招呼。每个单元格中都应该有一个按钮。我希望这一切都完成并编写代码并且根本不使用情节提要。 class 应保留为 uiview 控制器且不应更改。

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    private let myArray: NSArray = ["First","Second","Third"]
     var myTableView =  UITableView()

    override func viewDidLoad() {
        super.viewDidLoad()

        myTableView.register(UITableViewCell.self, forCellReuseIdentifier: "MyCell")
        myTableView.dataSource = self
        myTableView.delegate = self
        
        
        
        self.view.addSubview(myTableView)
        myTableView.translatesAutoresizingMaskIntoConstraints = false
        
        
        
        NSLayoutConstraint.activate([

            myTableView.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.90),
            myTableView.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1),
            myTableView.topAnchor.constraint(equalTo: view.topAnchor),
            myTableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),



        ])
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("Num: \(indexPath.row)")
        print("Value: \(myArray[indexPath.row])")
    }

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath as IndexPath)
        cell.textLabel!.text = "\(myArray[indexPath.row])"
        return cell
    }
}

Answer 1

您可以将 UIButton 添加到 UITableViewCell，只需将其添加到 cellForRow 方法中，如下所示：

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath)
    let button = UIButton()
    button.setTitle("\(myArray[indexPath.row])", for: .normal)
    button.center = cell.center
    cell.addSubview(button)
    return cell
}

上述方法虽然有效，但不推荐。您可能应该为 UITableViewCell 创建一个自定义 class 并将其用作您的单元格，如下所示：

class MyCustomCell: UITableViewCell {
    let button = UIButton()
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        addSubview(button)
        // do layout setup here
    }
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

用法：

override func viewDidLoad() {
    super.viewDidLoad()
    myTableView.register(MyCustomCell.self, forCellReuseIdentifier: "MyCell")
    //...
}
//...
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath) as! MyCustomCell
    cell.button.setTitle("\(myArray[indexPath.row])", for: .normal)
    return cell
}

Answer 2

创建 UITableViewcell 的子类 -

class MyCell: UITableViewCell {
    
    var buttonTapCallback: () -> ()  = { }
    
    let button: UIButton = {
        let btn = UIButton()
        btn.setTitle("Button", for: .normal)
        btn.backgroundColor = .systemPink
        btn.titleLabel?.font = UIFont.systemFont(ofSize: 14)
        return btn
    }()
    
    let label: UILabel = {
       let lbl = UILabel()
        lbl.font = UIFont.systemFont(ofSize: 16)
        lbl.textColor = .systemPink
       return lbl
    }()
    
    @objc func didTapButton() {
        buttonTapCallback()
    }
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        //Add button
        contentView.addSubview(button)
        button.addTarget(self, action: #selector(didTapButton), for: .touchUpInside)
        
        //Set constraints as per your requirements
        button.translatesAutoresizingMaskIntoConstraints = false
        button.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 20).isActive = true
        button.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
        button.widthAnchor.constraint(equalToConstant: 100).isActive = true
        button.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -10).isActive = true
        
        //Add label
        contentView.addSubview(label)
        //Set constraints as per your requirements
        label.translatesAutoresizingMaskIntoConstraints = false
        label.leadingAnchor.constraint(equalTo: button.trailingAnchor, constant: 20).isActive = true
        label.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
        label.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
        label.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -10).isActive = true
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
}

现在在你的视图控制器中注册这个单元格 -

myTableView.register(MyCell.self, forCellReuseIdentifier: "MyCell")

现在使用 cellForRowAt 方法加载此单元格 -

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath) as! MyCell
        cell.label.text = ""
        cell.buttonTapCallback = {
            cell.label.text = "Hi"
        }
        return cell
    }

以编程方式将按钮添加到 uitableview 单元格

Add button to uitableview cell programmatically

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