swift - 如何在 UIStackView Swift 4 中查找所选按钮的索引

Question

我正在尝试在堆栈 View 中查找所选按钮的索引。目前，我正在尝试通过在按钮上使用标签来做到这一点。最终目标是当长按手势停止时，选择堆栈 View 上的任何值，但目前，我的情况开关正在打印所有值，而不是所选值。我使用它而不是 collectionView 或 tableView，因为我发现它更容易实现动画。

按钮设置

let likeButton = UIButton(type: .system)
    likeButton.setImage(#imageLiteral(resourceName: "blue_like").withRenderingMode(.alwaysOriginal), for: .normal)
    likeButton.tag = 0
    let heartButton = UIButton(type: .system)
    heartButton.setImage(#imageLiteral(resourceName: "red_heart").withRenderingMode(.alwaysOriginal), for: .normal)
    heartButton.tag = 1
    let wowButton = UIButton(type: .system)
    wowButton.setImage(#imageLiteral(resourceName: "surprised").withRenderingMode(.alwaysOriginal), for: .normal)
    wowButton.tag = 2
    let laughButton = UIButton(type: .system)
    laughButton.setImage(#imageLiteral(resourceName: "cry_laugh").withRenderingMode(.alwaysOriginal), for: .normal)
    laughButton.tag = 3
    let sadButton = UIButton(type: .system)
    sadButton.setImage(#imageLiteral(resourceName: "cry").withRenderingMode(.alwaysOriginal), for: .normal)
    sadButton.tag = 4
    let angryButton = UIButton(type: .system)
    angryButton.setImage(#imageLiteral(resourceName: "angry").withRenderingMode(.alwaysOriginal), for: .normal)
    angryButton.tag = 5
    let buttons = [likeButton, heartButton, wowButton, laughButton, sadButton, angryButton]

长按手势结束

else if gesture.state == .ended {

        // clean up the animation
        UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
            let stackView = self.iconsContainerView.subviews.first
            stackView?.subviews.forEach({ (button) in
                button.transform = .identity
                switch button.tag {
                case 0:
                    print("like button")
                case 1:
                    print("Heart")
                case 2:
                    print("Wow")
                case 3:
                    print("Laugh")
                case 4:
                    print("Sad")
                case 5:
                    print("Angry")
                default:
                    fatalError("Oops, this should not happen")
                }
            })

            self.iconsContainerView.transform = self.iconsContainerView.transform.translatedBy(x: 0, y: 50)
            self.iconsContainerView.alpha = 0


        }, completion: { (_) in
            self.iconsContainerView.removeFromSuperview()
        })


    }

Answer 1

您最好的选择可能是为每个按钮附加一个长按手势，并在回调中检查 gesture.view。

参见:UIButton Long Press Event