ios - 在 titleView 中查看 Swift UITapGesture 不工作

Question

我有一个 UINavigationItem，我将它的 titleView 设置为一个嵌入了 UILabel 和 UIImageView 的 UIView。我正在尝试将 UITapGestureRecognizer 添加到 View 中，但它似乎不起作用。任何解决方案？此外，将 gestureRecognizer 添加到整个 navigationBar 不是一个选项，因为我有一个 rightBarButtonItem 并且想使用后退按钮。

这是我的代码:

func configureTitleView() {
    guard let profile = profile else { 
    // Pop navController
    return
  }

    let titleView = UIView()
    titleView.frame = CGRect(x: 0, y: 0, width: 100, height: 40)

    let containerView = UIView()
    containerView.translatesAutoresizingMaskIntoConstraints = false
    titleView.addSubview(containerView)

    let profileImageView = UIImageView()
    profileImageView.translatesAutoresizingMaskIntoConstraints = false
    profileImageView.contentMode = .scaleAspectFill
    profileImageView.clipsToBounds = true
    let imageURL = URL(string: profile!.firstProfilePicture!)
    profileImageView.sd_setImage(with: imageURL)

    containerView.addSubview(profileImageView)

    profileImageView.leftAnchor.constraint(equalTo: containerView.leftAnchor).isActive = true
    profileImageView.centerYAnchor.constraint(equalTo: containerView.centerYAnchor).isActive = true
    profileImageView.widthAnchor.constraint(equalToConstant: 36).isActive = true
    profileImageView.heightAnchor.constraint(equalToConstant: 36).isActive = true

    profileImageView.layer.cornerRadius = 36 / 2

    let nameLabel = UILabel()

    containerView.addSubview(nameLabel)
    nameLabel.text = profile!.displayName!
    nameLabel.textColor = .white
    nameLabel.translatesAutoresizingMaskIntoConstraints = false

    nameLabel.leftAnchor.constraint(equalTo: profileImageView.rightAnchor, constant: 8).isActive = true
    nameLabel.centerYAnchor.constraint(equalTo: profileImageView.centerYAnchor).isActive = true
    nameLabel.rightAnchor.constraint(equalTo: containerView.rightAnchor).isActive = true
    nameLabel.heightAnchor.constraint(equalTo: profileImageView.heightAnchor).isActive = true

    containerView.centerXAnchor.constraint(equalTo: titleView.centerXAnchor).isActive = true
    containerView.centerYAnchor.constraint(equalTo: titleView.centerYAnchor).isActive = true

    self.navigationItem.titleView = titleView

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.openProfile))
    tapGesture.numberOfTapsRequired = 1
    titleView.addGestureRecognizer(tapGesture)
    titleView.isUserInteractionEnabled = true
}

Answer 1

从 iOS 11 开始，使用 UIBarButtonItem(customView:) 作为 UIBarButtonItem 添加到工具栏的 View 现在使用自动布局进行布局。这包括通过 UIViewController 的 navigationItem.titleView 属性添加到 UINavigationBar 的标题 View 。您应该在 titleView 上添加大小限制。例如:

titleView.widthAnchor.constraint(equalToConstant: 100).isActive = true
titleView.heightAnchor.constraint(equalToConstant: 40.0).isActive = true

否则，自动布局将使用标题 View 的固有内容大小，即 CGSize.zero。手势被屏蔽到它们所附加的 View 的边界，即使该 View 的 subview 不是。因为没有约束的 titleView 的边界是 CGRect.zero 它永远不会触发。添加约束并按预期工作。

有关更多信息，请参阅 WWDC 2017 session Updating your app for iOS 11 .