带有 touchUpInside 的 UIButton 选择器在使用 Swift 4 的嵌套 UIView 中不起作用

Question

当我在嵌套的 UIView 中使用 UIButton 的选择器时，Tap 事件不起作用，但是如果我将 UIButton 及其选择器放在嵌套的 UIView 之外（在根视图中），它会识别 tap 事件并打印 "TAP TAP" 在控制台中。

我正在使用 swift 4.

This is the UIView that contains the login Button and it is a subview of the root view

let blueBottomView: UIView = {
    let bv = UIView()
    bv.backgroundColor = UIColor.MyColors.Blue.Light
    return bv
}()

This is the button and the tap event

let loginButton: UIButton = {
   let  lb = UIButton()
    lb.layer.cornerRadius = 16.0
    lb.layer.borderColor = UIColor.MyColors.Yellow.Light.cgColor
    lb.layer.borderWidth = 2.0
    lb.backgroundColor = UIColor.MyColors.Yellow.Light
    lb.setAttributedTitle(MyHelpers().createAttributeString(text: "Iniciar sesión", color: .white, bold: true), for: .normal)
    lb.addTarget(self, action: #selector(tapLoginButton), for: .touchUpInside)

    return lb
}()


@objc func tapLoginButton(){
    print("TAP TAP")
}

This is the section where the button becomes a child of the nested UIView

func createView(isLogin: Bool = true){
    addSubview(logoImageView)
    addSubview(loginSwitchButton)
    addSubview(registerSwitchButton)
    addSubview(lineSwitching)

    blueBottomView.addSubview(userTextField)
    blueBottomView.addSubview(passwordTextField)
    if (isLogin){
        confirmPasswordTextField.removeFromSuperview()
        createAccountButton.removeFromSuperview()
        blueBottomView.addSubview(loginButton)
        blueBottomView.addSubview(forgotPassword)
        blueBottomView.addSubview(redesSocialesLabel)
        blueBottomView.addSubview(facebookButton)
        blueBottomView.addSubview(googleButton)
    }else{
        loginButton.removeFromSuperview()
        forgotPassword.removeFromSuperview()
        redesSocialesLabel.removeFromSuperview()
        facebookButton.removeFromSuperview()
        googleButton.removeFromSuperview()
        blueBottomView.addSubview(confirmPasswordTextField)
        blueBottomView.addSubview(createAccountButton)
    }


    addSubview(blueBottomView)

    _ =  logoImageView.anchor(centerYAnchor, left: nil, bottom: nil, right: nil, topConstant: -250, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 354, heightConstant: 124)

    logoImageView.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true

    _ =  loginSwitchButton.anchor(logoImageView.bottomAnchor, left: leftAnchor, bottom: nil, right: nil, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: frame.width/2, heightConstant: 35).first

    _ =  registerSwitchButton.anchor(logoImageView.bottomAnchor, left: nil, bottom: nil, right: rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: frame.width/2, heightConstant: 35).first

    _ =  lineSwitching.anchor(registerSwitchButton.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 5)

    blueBottomView.anchorToTop(lineSwitching.bottomAnchor, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor)

    _ = userTextField.anchor(lineSwitching.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 20, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 35)

    _ = passwordTextField.anchor(userTextField.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 35)


    if (isLogin){
        _ = loginButton.anchor(passwordTextField.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 82, bottomConstant: 0, rightConstant: 82, widthConstant: 0, heightConstant: 35)

        _ = forgotPassword.anchor(loginButton.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 82, bottomConstant: 0, rightConstant: 82, widthConstant: 0, heightConstant: 35)


        redesSocialesLabel.anchorWithConstantsToTop(forgotPassword.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 25, leftConstant: 16, bottomConstant: 0, rightConstant: 16)//Margins at the left and right hand side

        redesSocialesLabel.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true

        _ = facebookButton.anchor(redesSocialesLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 52, bottomConstant: 0, rightConstant: 52, widthConstant: 0, heightConstant: 35)

        _ = googleButton.anchor(facebookButton.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 52, bottomConstant: 0, rightConstant: 52, widthConstant: 0, heightConstant: 35)
    }else{
        _ = confirmPasswordTextField.anchor(passwordTextField.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 35)

        _ = createAccountButton.anchor(confirmPasswordTextField.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 82, bottomConstant: 0, rightConstant: 82, widthConstant: 0, heightConstant: 35)

    }
}

感谢您的帮助！

Answer 1

终于找到解决办法了！我将 let 定义更改为惰性变量，它起作用了！

lazy var loginButton: UIButton = {
 let  lb = UIButton()
 lb.layer.cornerRadius = 16.0
 lb.layer.borderColor = UIColor.MyColors.Yellow.Light.cgColor
 lb.layer.borderWidth = 2.0
 lb.backgroundColor = UIColor.MyColors.Yellow.Light
 lb.setAttributedTitle(MyHelpers().createAttributeString(text:  "Iniciar sesión", color: .white, bold: true), for: .normal)
lb.addTarget(self, action: #selector(tapLoginButton), for: .touchUpInside)

return lb
}()

带有 touchUpInside 的 UIButton 选择器在使用 Swift 4 的嵌套 UIView 中不起作用

UIButton selector with touchUpInside is not working in nested UIViews using Swift 4

nested

selector

uibutton

uiview

swift4