将点击手势添加到任何视图都不会触发任何内容

Question

到目前为止，我正在处理 iOS 开发过程中最令人沮丧的一个问题。我最初试图在我的 UIImage 视图中添加一个手势识别器，但没有成功。我在堆栈上进行了一些搜索，发现我没有设置 imageView.isUserInteractionEnabled = true，我认为这可以解决我的问题，但事实并非如此。因此，我开始向包括 imageView 的父视图在内的所有内容添加手势识别器，但仍然一无所获。我确信我 doing/haven 没有完成的事情是如此简单，但我完全错过了它。请帮忙。

ProfileViewController: UIViewController {

    // User's info container (Parent iof imageView)
let userInfoContainer: UIView = {
    let head = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    head.backgroundColor = UIColor.white
    head.translatesAutoresizingMaskIntoConstraints = false
    head.layer.borderWidth = 1
    print(head.isUserInteractionEnabled) // Returns true
    let tap = UITapGestureRecognizer(target: self, action: #selector(tapped))
    head.addGestureRecognizer(tap)
    return head
}()
// Users name
let userName: UITextField = {
    let name = UITextField()
    name.text = "John Doe"
    name.translatesAutoresizingMaskIntoConstraints = false
    name.isUserInteractionEnabled  = true
    let tap = UITapGestureRecognizer(target: self, action: #selector(tapped))
    name.addGestureRecognizer(tap)
    return name
}()

    // User's profile image
let profileImageView: UIImageView = {
    let imageView = UIImageView(image: #imageLiteral(resourceName: "avatar"))
    imageView.layer.cornerRadius = 50
    imageView.layer.masksToBounds = true
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.isUserInteractionEnabled = true
    imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(tapped)))
    return imageView
}()
//
//
// skipping other UI elements
//
//
override func viewDidLoad() {
    super.viewDidLoad()
    // Authentication bits

    self.title = "Profile View"
    self.view.backgroundColor = UIColor.white
    self.view.addSubview(userInfoContainer)
    self.view.addSubview(profileImageView)
    self.view.addSubview(userName)
    } // end viewDidLoad
func tapped() {
    print(123)
}

// setup constraints
func setupUserInfoContainer() {
    userInfoContainer.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    userInfoContainer.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
    userInfoContainer.heightAnchor.constraint(equalToConstant: 200).isActive = true
}
// profile image arrangement
func setupProfileImage() {
    profileImageView.leftAnchor.constraint(equalTo: userInfoContainer.leftAnchor, constant: 20).isActive = true
    profileImageView.centerYAnchor.constraint(equalTo: userInfoContainer.centerYAnchor).isActive = true
    profileImageView.heightAnchor.constraint(equalToConstant: 100).isActive = true
    profileImageView.widthAnchor.constraint(equalToConstant: 100).isActive = true

}

func setupLabels() {
    userName.leftAnchor.constraint(equalTo: profileImageView.rightAnchor, constant: 20).isActive = true
    userName.centerYAnchor.constraint(equalTo: profileImageView.centerYAnchor).isActive = true
    userName.heightAnchor.constraint(equalToConstant: 20).isActive = true
    userName.isEnabled = false
}
} // end view controller

渲染视图：查看层次结构可能不需要的额外信息：ProfileViewController 由 UITabBarController 处理，但据我所见，这应该没有什么不同。

更新环顾四周，看起来合适的 swift 3 语法是 let tap = UITapGestureRecognizer(target: self, action: #selector(self.tapped(_:))) 但我认为在闭包中包含该行是导致抛出此错误的原因 ../ProfileViewController.swift:37:74: Value of type '(NSObject) -> () -> ProfileViewController' has no member 'tapped'

如果有人能解释我如何解决这个问题，那就太棒了。

Answer 1

问题是您没有将委托设置为点击手势。检查 this

希望这会奏效

Answer 2

我不相信你可以用这种方式分配手势识别器...

1 let profileImageView: UIImageView = {
2     let imageView = UIImageView(image: #imageLiteral(resourceName: "avatar"))
3     imageView.layer.cornerRadius = 50
4     imageView.layer.masksToBounds = true
5     imageView.translatesAutoresizingMaskIntoConstraints = false
6     imageView.isUserInteractionEnabled = true
7     imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(tapped)))
8     return imageView
9 }()

第 7 行，self 是什么？返回 UIImageView.

的是函数

您的 func tapped() 不是该函数的一部分...它属于 ProfileViewController。

您可能能够找到改变目标的方法，但我尝试了几分钟不同的方法并没有带来任何好运。

我认为您需要在 ProfileViewController / viewDidLoad() 内（或 class 内的其他地方）创建并添加 GestureRecognizer。

Answer 3

你为什么不在 class 的顶部初始化你的图像视图，比如

 let profileImageView = UIImageView()

并创建一个函数来配置 imageview 并将其添加为子视图，以便在视图中加载。这应该有效

func configureImageView() { 
    #add methods and customize image view
    #add image view to sub view 
}

将点击手势添加到任何视图都不会触发任何内容

Adding Tap Gesture to any view triggers nothing

uikit

ios

uitapgesturerecognizer

swift

swift3