ios - UIButton 上的 addTarget 不起作用

Question

我有一个 UIView 类

class FloatingView  : UIView {
    lazy var floatingButton : UIButton = {
        let button = UIButton(type: UIButtonType.system)
        button.setBackgroundImage(#imageLiteral(resourceName: "ic_add_circle_white_36pt"), for: .normal)
        button.tintColor = UIColor().themePurple()
        button.addTarget(self, action: #selector(buttonClicked), for: UIControlEvents.touchUpInside)
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupViews()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setupViews(){ addSubview(floatingButton) }

    override func didMoveToWindow() {
        super.didMoveToWindow()

        floatingButton.rightAnchor.constraint(equalTo: layoutMarginsGuide.rightAnchor).isActive = true
        floatingButton.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor).isActive = true
        floatingButton.widthAnchor.constraint(equalToConstant: 60).isActive = true
        floatingButton.heightAnchor.constraint(equalToConstant: 60).isActive = true
    }

    @objc func buttonClicked (){
        print("Clicked..")
    }

添加此以查看

let floatingButton = FloatingView()
view.addSubview(floatingButton)

我还指定了浮动视图的约束。

该按钮已按预期添加到视图中，但单击按钮时未调用“buttonClicked”函数。单击时按钮上的淡入淡出动画虽然有效。我尝试过 UITapGesture 但不工作。

我已将课程更新如下

class FloatingView{
    lazy var floatingButton : UIButton = {
        let button = UIButton(type: UIButtonType.system)
        button.setBackgroundImage(#imageLiteral(resourceName: "ic_add_circle_white_36pt"), for: .normal)
        button.tintColor = UIColor().themePurple()
        button.addTarget(self, action: #selector(buttonClicked(_:)), for: UIControlEvents.touchUpInside)
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()

    private var view : UIView!

    func add(onview: UIView ){
        view = onview
        configureSubViews()
    }

    private func configureSubViews(){
        view.addSubview(floatingButton)
        floatingButton.rightAnchor.constraint(equalTo: view.layoutMarginsGuide.rightAnchor).isActive = true
        floatingButton.bottomAnchor.constraint(equalTo: view.layoutMarginsGuide.bottomAnchor).isActive = true
        floatingButton.widthAnchor.constraint(equalToConstant: 60).isActive = true
        floatingButton.heightAnchor.constraint(equalToConstant: 60).isActive = true
    }

    @objc func buttonClicked(_ sender : UIButton){
        print("Button Clicked")
    }
}

在控制器中

let flButton = FloatingView()
flButton.add(onview: view)

我正在尝试创建一个像这样的浮动操作按钮。我不确定我的做法是否正确。

Answer 1

尝试将动作更改为

action: #selector(buttonClicked(_:))

和功能

@objc func buttonClicked(_ sender: UIButton){..}

Answer 2

我通过将自定义类中的约束设置到其超级视图而不是控制器来以某种方式修复它。

func configureSubviews(){
    if let superView = superview {
        superView.addSubview(floatingButton)
        widthAnchor.constraint(equalToConstant: circleSpanArea).isActive = true
        heightAnchor.constraint(equalTo: widthAnchor).isActive = true
        centerXAnchor.constraint(equalTo: floatingButton.centerXAnchor).isActive = true
        centerYAnchor.constraint(equalTo: floatingButton.centerYAnchor).isActive = true

        floatingButton.rightAnchor.constraint(equalTo: superView.layoutMarginsGuide.rightAnchor).isActive = true
        floatingButton.bottomAnchor.constraint(equalTo: superView.layoutMarginsGuide.bottomAnchor).isActive = true
        floatingButton.heightAnchor.constraint(equalToConstant: 60).isActive = true
        floatingButton.widthAnchor.constraint(equalToConstant: 60).isActive = true

    }
}