ios - 了解 UITableViewCell 子类中 UIButton 的逻辑

Question

我的应用程序中有几个 UITableView 实例，它们都包含 UITableViewCell 子类的实例，称为 BeerTableViewCell。在我的子类中，我添加了几个 UILabel 实例和几个 UIButton 实例。 BeerTableViewCell 的代码如下:

import UIKit
import CoreData




class BeerTableViewCell: UITableViewCell {




//////////////////////////////////////////////////////////////
//      MARK: - Properties
//////////////////////////////////////////////////////////////

    var beerNameLabel = UILabel()
    var breweryNameLabel = UILabel()
    var beerCategoryReferenceImageView = UIImageView()
    var likeButton = UIButton()
    var tryButton = UIButton()
    var dislikeButton = UIButton()
    var deleteButton = UIButton()
    var categoryButtonsArray = [UIButton]()


//////////////////////////////////////////////////////////////
//      MARK: - View Lifecycle
//////////////////////////////////////////////////////////////

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
        self.autoresizingMask = .FlexibleHeight
        self.clipsToBounds = true
    }




    override func layoutSubviews() {
        super.layoutSubviews()
        beerNameLabel.frame = CGRectMake(10, 8, self.bounds.size.width - 40, 26)
        beerNameLabel.font = UIFont(name: "Avenir Next", size: 18)
        contentView.addSubview(beerNameLabel)

        breweryNameLabel.frame = CGRectMake(10, 32, self.bounds.size.width - 40, 20)
        breweryNameLabel.font = UIFont(name: "Avenir Next", size: 14)
        breweryNameLabel.alpha = 0.5
        contentView.addSubview(breweryNameLabel)

        beerCategoryReferenceImageView.frame = CGRectMake(self.bounds.size.width-35, 20, 20, 20)
        beerCategoryReferenceImageView.image = UIImage()
        contentView.addSubview(beerCategoryReferenceImageView)

        likeButton.frame = CGRectMake(20, 70, 30, 30)
        contentView.addSubview(likeButton)

        tryButton.frame = CGRectMake(90, 70, 30, 30)
        contentView.addSubview(tryButton)

        dislikeButton.frame = CGRectMake(160, 70, 30, 30)
        contentView.addSubview(dislikeButton)

        deleteButton.frame = CGRectMake(230, 70, 30, 30)
        contentView.addSubview(deleteButton)

        let likeNormalImage = UIImage(named: "like-button")
        let likeSelectedImage = UIImage(named: "like-button")
        likeButton.setImage(likeNormalImage, forState: .Normal)
        likeButton.setImage(likeSelectedImage, forState: .Selected)

        let tryNormalImage = UIImage(named: "try-button")
        let trySelectedImage = UIImage(named: "try-button")
        tryButton.setImage(tryNormalImage, forState: .Normal)
        tryButton.setImage(trySelectedImage, forState: .Selected)

        let dislikeNormalImage = UIImage(named: "dislike-button")
        let dislikeSelectedImage = UIImage(named: "dislike-button")
        dislikeButton.setImage(dislikeNormalImage, forState: .Normal)
        dislikeButton.setImage(dislikeSelectedImage, forState: .Selected)

        let deleteNormalImage = UIImage(named: "delete-button")
        let deleteSelectedImage = UIImage(named: "delete-button")
        deleteButton.setImage(deleteNormalImage, forState: .Normal)
        deleteButton.setImage(deleteSelectedImage, forState: .Selected)1

        likeButton.addTarget(self, action: "handleButtonPress", forControlEvents: .TouchUpInside)
        tryButton.addTarget(self, action: "handleButtonPress", forControlEvents: .TouchUpInside)
        dislikeButton.addTarget(self, action: "handleButtonPress", forControlEvents: .TouchUpInside)
        deleteButton.addTarget(self, action: "handleButtonPress", forControlEvents: .TouchUpInside)

        categoryButtonsArray.append(likeButton)
        categoryButtonsArray.append(tryButton)
        categoryButtonsArray.append(dislikeButton)
} 




//////////////////////////////////////////////////////////////
//      MARK: - States
//////////////////////////////////////////////////////////////

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        // Configure the view for the selected state
}



//////////////////////////////////////////////////////////////
//      MARK: - Helpers
//////////////////////////////////////////////////////////////

    func handleButtonPress() {
        println("Button Pressed")
    }


}

在我的任何 UITableView 实例中按下按钮时，我很难找到执行操作的方法。我能够成功地向按钮添加一个 Action ，该 Action 将打印出按下了一个按钮 (println("Button Tapped"):

我无法弄清楚如何实现委托(delegate)方法来处理按钮按下。我发现的每个教程都通过 Interface Builder 实现了 UIButton 操作。我是否需要使用 Interface Builder 来创建按钮并为它们 Hook 操作？如您所见，我目前正在用代码创建我的按钮，但我发现的教程大部分都是这样做的 this方式。

不胜感激!

已解决:

为了让符合委托(delegate)协议(protocol)的 View Controller 允许将 self 分配给单元格的委托(delegate)，我只需要在 View Controller 中实现委托(delegate)方法。如果我不添加委托(delegate)方法，Xcode 将不允许分配。

Answer 1

您有几个选择。您可以在 cellForRowAtIndexPath: 中调用 addTarget:action:forControlEvents: 而不是在您的单元类中(将自身作为目标传递)，或者您可以使用委托(delegate)协议(protocol)(其中在这种情况下，您可以将自己设置为 cellForRowAtIndexPath 中单元格的委托(delegate))。在单元格类中创建委托(delegate)协议(protocol)，添加委托(delegate)属性，并从按钮的操作方法中调用委托(delegate)方法。您将在 TableView Controller 中实现委托(delegate)方法以适本地响应按钮触摸。