UIButton 在具有动画未检测到触摸的视图中

Question

我正在按照教程创建交互式弹出动画(http://www.swiftkickmobile.com/building-better-app-animations-swift-uiviewpropertyanimator/(，现在想向弹出窗口添加按钮，而不是像教程中那样使用静态文本。

动画工作正常，但按钮未检测到触摸。触摸按钮会导致动画反转，而不是打印我的"test"语句。 根据研究，它看起来要么是视图层次结构的问题，要么是禁用按钮触摸的动画，要么是按钮的布局/约束问题。我尝试解决上述问题，但没有任何效果，希望有人能够提供帮助吗？

我省略了与动画相关的代码，因为我认为问题与布局有关(并且动画似乎工作正常( - 但它仍然很多; 提前为大量代码道歉。

class ViewController: UIViewController {
private let popupOffset: CGFloat = 440
private lazy var contentImageView: UIImageView = {
let imageView = UIImageView()
imageView.image = #imageLiteral(resourceName: "Background")
return imageView
}()
private lazy var overlayView: UIView = {
let view = UIView()
view.backgroundColor = .black
view.alpha = 0
return view
}()
private lazy var popupView: UIView = {
let view = UIView()
view.backgroundColor = .white
view.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner]
view.layer.shadowColor = UIColor.black.cgColor
view.layer.shadowOpacity = 0.1
view.layer.shadowRadius = 10
return view
}()
private lazy var closedTitleLabel: UILabel = {
let label = UILabel()
label.text = "Hello"
label.font = UIFont.systemFont(ofSize: 16, weight: UIFont.Weight.medium)
label.textColor = UIColor.darkGray
label.textAlignment = .center
return label
}()
private lazy var openTitleLabel: UILabel = {
let label = UILabel()
label.text  = "Which door will you choose?"
label.font = UIFont.systemFont(ofSize: 16, weight: UIFont.Weight.medium)
label.textColor = UIColor.darkGray
label.textAlignment = .center
label.alpha = 0
label.transform = CGAffineTransform(scaleX: 1.6, y: 1.6).concatenating(CGAffineTransform(translationX: 0, y: 15))
return label
}()
private lazy var reviewsImageView: UIImageView = {
let imageView = UIImageView()
imageView.image = #imageLiteral(resourceName: "LabelBackground")
return imageView
}()
let stackView = UIStackView()
let buttonA = UIButton()
let buttonB = UIButton()
let buttonC = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
layout()
popupView.addGestureRecognizer(panRecognizer)
}
override var prefersStatusBarHidden: Bool {
return true
}
//Layout
private var bottomConstraint = NSLayoutConstraint()
private func layout() {
contentImageView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(contentImageView)
contentImageView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
contentImageView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
contentImageView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
contentImageView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
overlayView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(overlayView)
overlayView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
overlayView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
overlayView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
overlayView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
popupView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(popupView)
popupView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
popupView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
bottomConstraint = popupView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: popupOffset)
bottomConstraint.isActive = true
popupView.heightAnchor.constraint(equalToConstant: 500).isActive = true
closedTitleLabel.translatesAutoresizingMaskIntoConstraints = false
popupView.addSubview(closedTitleLabel)
closedTitleLabel.leadingAnchor.constraint(equalTo: popupView.leadingAnchor).isActive = true
closedTitleLabel.trailingAnchor.constraint(equalTo: popupView.trailingAnchor).isActive = true
closedTitleLabel.topAnchor.constraint(equalTo: popupView.topAnchor, constant: 20).isActive = true
openTitleLabel.translatesAutoresizingMaskIntoConstraints = false
popupView.addSubview(openTitleLabel)
openTitleLabel.leadingAnchor.constraint(equalTo: popupView.leadingAnchor).isActive = true
openTitleLabel.trailingAnchor.constraint(equalTo: popupView.trailingAnchor).isActive = true
openTitleLabel.topAnchor.constraint(equalTo: popupView.topAnchor, constant: 20).isActive = true
reviewsImageView.translatesAutoresizingMaskIntoConstraints = false
popupView.addSubview(reviewsImageView)
reviewsImageView.leadingAnchor.constraint(equalTo: popupView.leadingAnchor).isActive = true
reviewsImageView.trailingAnchor.constraint(equalTo: popupView.trailingAnchor).isActive = true
reviewsImageView.bottomAnchor.constraint(equalTo: popupView.bottomAnchor).isActive = true
reviewsImageView.heightAnchor.constraint(equalToConstant: 428).isActive = true
buttonA.backgroundColor = UIColor.clear
let heightConstraintA = buttonA.heightAnchor.constraint(equalToConstant: 135)
heightConstraintA.isActive = true
heightConstraintA.priority = UILayoutPriority(rawValue: 999)
buttonA.translatesAutoresizingMaskIntoConstraints = false
buttonA.setTitle("A", for: .normal)
buttonA.setTitleColor(UIColor.darkGray, for: .normal)
buttonA.backgroundColor = UIColor.clear
buttonA.addTarget(self, action: #selector(buttonATapped(sender:)), for: .touchDown)
//self.popupView.addSubview(buttonA)
buttonB.backgroundColor = UIColor.clear
let heightConstraintB = buttonB.heightAnchor.constraint(equalToConstant: 135)
heightConstraintB.isActive = true
heightConstraintB.priority = UILayoutPriority(rawValue: 999)
buttonB.translatesAutoresizingMaskIntoConstraints = false
buttonB.setTitle("B", for: .normal)
buttonB.setTitleColor(UIColor.darkGray, for: .normal)
buttonB.backgroundColor = UIColor.clear
//self.popupView.addSubview(buttonB)
buttonC.backgroundColor = UIColor.clear
let heightConstraintC = buttonC.heightAnchor.constraint(equalToConstant: 135)
heightConstraintC.isActive = true
heightConstraintC.priority = UILayoutPriority(rawValue: 999)
buttonC.translatesAutoresizingMaskIntoConstraints = false
buttonC.setTitle("C", for: .normal)
buttonC.setTitleColor(UIColor.darkGray, for: .normal)
buttonC.backgroundColor = UIColor.clear
//self.popupView.addSubview(buttonC)
popupView.addSubview(stackView)
stackView.backgroundColor = UIColor.clear
stackView.addArrangedSubview(buttonA)
stackView.addArrangedSubview(buttonB)
stackView.addArrangedSubview(buttonC)
stackView.translatesAutoresizingMaskIntoConstraints = false
popupView.addSubview(stackView)
stackView.leadingAnchor.constraint(equalTo: popupView.leadingAnchor).isActive = true
stackView.trailingAnchor.constraint(equalTo: popupView.trailingAnchor).isActive = true
stackView.bottomAnchor.constraint(equalTo: popupView.bottomAnchor).isActive = true
stackView.heightAnchor.constraint(equalToConstant: 428).isActive = true
stackView.axis = .vertical
stackView.distribution = .fill
stackView.translatesAutoresizingMaskIntoConstraints = false
}
@objc func buttonATapped(sender: UIButton) {
print ("test")
}

private func animateTransitionIfNeeded(to state: State, duration: TimeInterval) {
//Animation code
}
@objc private func popupViewPanned(recognizer: UIPanGestureRecognizer) {
//Animation code
}
}

对于其他有相同问题的人，这是我解决它的方法，感谢@OverD： 我完全删除了reviewsImageView(因为在我的情况下，这只是为了颜色，我可以轻松地将颜色添加到UIButton(然后我没有将按钮添加到弹出窗口视图中，而是将它们添加到堆栈视图中，并将堆栈视图添加到弹出视图。最后，我的addTarget语法不正确，由于某种原因将其更改为touchDown而不是touchUpInside使其工作。

Answer 1

我从提供的代码中注意到您多次添加相同的按钮，一次作为 popView 的子视图，一次作为堆栈视图。此外，您没有为按钮分配任何目标。

我希望这有帮助