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 float View 的约束。

按钮已按预期添加到 View 中，但单击按钮时未调用“buttonClicked”函数。虽然单击时按钮上的淡入淡出动画有效。我已经尝试过 UITapGesture 但没有工作。

我已经更新类如下

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 Controller 中

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

我正在尝试创建一个 float 操作按钮 like this .我不确定我的做法是否正确。

Answer 1

试着把 Action 改成

Action :#selector(buttonClicked(_:))

和函数

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