swift - 如何为多个按钮设置相同的 IBAction？

Question

我正在尝试将多个按钮链接到相同的IBAction，以运行类似但不同的代码。代码是将在另一个 View Controller 上单击的图像设置到按钮下的 UIImageView 中。所有按钮都链接到相同的 View Controller ，但具有不同的序列。

我试图写一个 if 语句，但我似乎没有写对。我已命名每个相应的 UIImage View :technologyImageViewTwo、technologyImageViewThree ...等

下面是我用于第一个按钮的代码，它与名为 technologyImageView 的相应 UIImageView 一起使用

@IBAction func setTechnology(segue:UIStoryboardSegue) {
        dismiss(animated: true) {

            if let technology = segue.identifier{
                self.persona.technology = technology
                self.technologyView.technologyImageView.image = UIImage(named: technology)
            }

            //animating scale up of image
            let scaleUp = CGAffineTransform.init(scaleX: 0.1, y:0.1)
            self.technologyView.technologyImageView.transform = scaleUp
            self.technologyView.technologyImageView.alpha = 0

            //animating bounce effect 
            UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.7, options: [], animations: {
                self.technologyView.technologyImageView.transform = .identity
                self.technologyView.technologyImageView.alpha = 1
            }, completion: nil)
        }

我希望每个按钮都应该转到 Segued View Controller ，并且所选的图像将显示在相应的按钮下。例如，如果我单击“Technology 2”按钮并选择一个图像，该图像将显示在名为 technologyImageViewTwo 的 UIImageview 中。

Answer 1

有几个选项可供您选择:

选项 1:

这个选项会更受欢迎，即使用组件上的标签属性，这将允许您在按钮被操作时识别按钮的索引。

https://developer.apple.com/documentation/uikit/uiview/1622493-tag

@IBAction func action(_ sender: Any) {
    dismiss(animated: true) {
         var imageView: UIImageView!
         let index = (sender as? UIView)?.tag ?? 0

         switch index {
         case 1:
             persona.technology = <#T##String#>
             imageView = technologyView.technologyImageViewTwo
         case 2:
             persona.technology = <#T##String#>
             imageView = technologyView.technologyImageViewThree
         default:
             persona.technology = <#T##String#>
             imageView = technologyView.technologyImageView
        }

        if let technology = persona.technology {
             imageView.image = UIImage(named: technology)
        }

        //animating scale up of image
        let scaleUp = CGAffineTransform.init(scaleX: 0.1, y:0.1)
        imageView.transform = scaleUp
        imageView.alpha = 0

        //animating bounce effect
        UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.7, options: [], animations: {
            imageView.transform = .identity
            imageView.alpha = 1
        })
    }
}

选项 2:

如果您想继续使用现有的代码，则可以使用 Segue 标识符，其中包含可以拆分的组件，使您能够更有效地识别它们:

segueIdentifier-1, segueIdentifier-2, segueIdentifier-3

func setTechnology(segue: UIStoryboardSegue) {
     dismiss(animated: true) {

        var imageView: UIImageView!
        let identifierComponents = segue.identifier?.components(separatedBy: "-")
        let index = Int(identifierComponents?.last ?? "0")

        switch index {
        case 1:
            imageView = technologyView.technologyImageViewTwo
        case 2:
            imageView = technologyView.technologyImageViewThree
        default:
            imageView = technologyView.technologyImageView
        }

        if let technology = identifierComponents?.first {
            self.persona.technology = technology
            imageView.image = UIImage(named: technology)
        }

        //animating scale up of image
        let scaleUp = CGAffineTransform.init(scaleX: 0.1, y:0.1)
        imageView.transform = scaleUp
        imageView.alpha = 0

        //animating bounce effect
        UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.7, options: [], animations: {
            imageView.transform = .identity
            imageView.alpha = 1
        })
    }
}