Question

到目前为止，我正在处理iOS开发之旅中最令人沮丧的问题。我最初试图在我的UIImage视图中添加手势识别器，但没有任何运气。我在堆栈上做了一些搜索，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。那么我开始向所有内容添加手势识别器，包括imageView的父视图，但仍然没有任何内容。我确信我正在做的事情/未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正在由UITabBarController处理，但从我所看到的情况来看，这不应该有所作为。

更新从环顾四周看起来似乎是合适的swift 3语法 let tap = UITapGestureRecognizer(target: self, action: #selector(self.tapped(_:)))但我认为在闭包中使用该行会导致抛出此错误../ProfileViewController.swift:37:74: Value of type '(NSObject) -> () -> ProfileViewController' has no member 'tapped'

如果有人能够解释我如何能够解决这个问题，那就太棒了。

Answer 1

我不相信你能以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？函数正在返回UIImageView。

您的func tapped()不属于该功能......它属于ProfileViewController。

你可能能够找到改变目标的方法，但是几分钟尝试不同的方法并没有给我带来任何好运。

我认为您需要在ProfileViewController / viewDidLoad()（或该类中的其他位置）内创建和添加GestureRecognizer。

Answer 2

问题是你没有将委托设置为点击手势。查看this

希望这会起作用

Answer 3

为什么不直接在课堂顶部初始化你的图像视图，如

 let profileImageView = UIImageView()

并创建一个函数来配置imageview并将其添加为子视图，例如在视图中加载。这应该工作

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

将Tap Gesture添加到任何视图都不会触发

3 个答案: