以编程方式将按钮添加到uitableview单元格

Question

我只想让我的代码在每个包含文本的表格视图单元格中生成一个按钮。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。该类应保持为 uiview 控制器且不可更改。

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

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")
    }
    
}

现在在您的视图控制器中注册此单元格 -

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

现在使用 cellForRowAt 方法加载这个单元格 -

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
    }

Answer 2

您可以将UIButton 添加到UITableViewCell，只需在cellForRow 方法中添加即可，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
}

虽然上述方法有效，但不推荐。您可能应该为UITableViewCell 创建一个自定义类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
}