UIButton上的addTarget不起作用

Question

我有一個UIView類

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..")
    }

添加此內容以查看

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

我還為浮動視圖指定了約束。

該按鈕已按預期添加到視圖中，但是單擊按鈕時未調用“ buttonClicked”函數。 但是，單擊按鈕時的淡入淡出動畫仍然有效。

我已經更新了以下課程

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")
    }
}

並在控制器中

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

我正在嘗試創建一個像這樣的浮動操作按鈕。 我不確定我是否做對了。

Answer 1

嘗試將動作更改為

action: #selector(buttonClicked(_:))

和功能

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

Answer 2

我以某種方式通過將約束從自定義類內部設置為其父視圖而不是從控制器進行了固定。

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

    }
}