ios - 通过更改 alpha swift iOS 启用用户交互

Question

我有一个带有点击功能的 View (启用了用户交互)。如果我在不改变 alpha 的情况下设置它，它会很好地工作。但是，如果我尝试延迟更改此 View 的 alpha，则无法在此动画期间点击它。有人可以帮忙吗？

这是我的代码:

import UIKit

class ViewController: UIViewController {

var myView = UIView()
var n = 0

override func viewDidLoad() {
    super.viewDidLoad()

    setView()
    changeAlpha()

}

func changeAlpha() {

        UIView.animate(withDuration: 5) {
            self.myView.alpha = 0.1
        }
    }

func setView() {

    let size = view.frame.width
    myView = UIView(frame: CGRect(x: 0, y: 0, width: size/3, height: size/3))
    myView.center = view.center
    myView.backgroundColor = UIColor.red
    view.addSubview(myView)

    myView.isUserInteractionEnabled = true
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(gameObjectTapped(_:)))
    myView.addGestureRecognizer(tapGestureRecognizer)

}

@objc func gameObjectTapped(_ recognizer:UITapGestureRecognizer) {

    print("# tap \(n)")
    n+=1

}

Answer 1

使用选项 .allowUserInteraction 运行动画:

UIView.animate(withDuration: 5, delay: 0, options: [.allowUserInteraction], animations: {
    self.myView.alpha = 0.1
}, completion: nil)