UIButtonClass addTarget新视图问题

Question

我已经创建了一个自定义UI按钮类，并且我正在尝试在我的UIViewController类中为这些按钮添加特定的目标，因为我知道我不能这样做。这是我到目前为止所知道的：

class CustomButton: UIButton{
    override init(frame: CGRect){
        super.init(frame: frame)
        setConfig()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setConfig()
    }
    func setConfig(){
        backgroundColor = UIColor(named: "SpecialGreen")
        layer.borderColor = UIColor.darkGray.cgColor
        layer.borderWidth = 1
        layer.cornerRadius = 5.0
        layer.zPosition = 2
        titleLabel?.font = UIFont(name: "PingFangSC-Semibold", size: 15)
    }
    func touchIn(){
        UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction,.curveEaseIn], animations: {
            self.transform = .init(scaleX: 0.9, y: 0.9)
        }, completion: nil)
    }
    func touchOut(){
        UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction,.curveEaseOut], animations: {
            self.transform = .identity
        }, completion: nil)
        let impactFeedbackgenerator = UIImpactFeedbackGenerator(style: .rigid)
        impactFeedbackgenerator.prepare()
        impactFeedbackgenerator.impactOccurred()
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        touchIn()
    }
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        touchOut()
        
    }
    
}

在我的主类中，我创建了这样的按钮：

        let settingsbtn = CustomButton()
        settingsbtn.backgroundColor = .clear
        settingsbtn.layer.borderWidth = 0
        settingsbtn.frame = CGRect(x: view.bounds.size.width - 60, y: 60, width: 50, height: 50)
        settingsbtn.tintColor = UIColor.gray
        settingsbtn.setImage(settingsImage, for: .normal)
        settingsbtn.layer.zPosition = 2
        settingsbtn.tag = 5
        self.view.addSubview(settingsbtn)

我该如何使用自定义按钮来定位新的视图控制器。我试过很多方法，但我似乎不能得到它。我会在UIButton类中将其创建为目标，但该类不能识别任何带有视图的内容。谢谢!

为了增加一些清晰度，我打算按下按钮并呈现一个不同的视图控制器。

Answer 1

你有几个选择。

首先，不是覆盖touch事件，而是覆盖isHighlighted并在那里执行动画。然后，你可以使用普通的.addTarget(...)，并在你的touchUpInside选择器函数中触发触觉反馈。

下面是一个完整的示例：

class CustomButton: UIButton {
    override init(frame: CGRect){
        super.init(frame: frame)
        setConfig()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setConfig()
    }
    func setConfig(){
        backgroundColor = UIColor(named: "SpecialGreen")
        layer.borderColor = UIColor.darkGray.cgColor
        layer.borderWidth = 1
        layer.cornerRadius = 5.0
        layer.zPosition = 2
        titleLabel?.font = UIFont(name: "PingFangSC-Semibold", size: 15)
    }
    override var isHighlighted: Bool {
        didSet {
            if isHighlighted {
                UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction,.curveEaseIn], animations: {
                    self.transform = .init(scaleX: 0.9, y: 0.9)
                }, completion: nil)
            } else {
                UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction,.curveEaseOut], animations: {
                    self.transform = .identity
                }, completion: nil)
            }
        }
    }
}

和示例视图控制器：

class CustViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let settingsbtn = CustomButton()
        settingsbtn.backgroundColor = .clear
        settingsbtn.layer.borderWidth = 0
        settingsbtn.frame = CGRect(x: view.bounds.size.width - 60, y: 60, width: 50, height: 50)
        settingsbtn.tintColor = UIColor.gray
        if let settingsImage = UIImage(systemName: "slider.horizontal.3") {
            settingsbtn.setImage(settingsImage, for: .normal)
        }
        settingsbtn.layer.zPosition = 2
        settingsbtn.tag = 5
        self.view.addSubview(settingsbtn)
        
        settingsbtn.addTarget(self, action: #selector(self.settingsButtonTapped(_:)), for: .touchUpInside)
    }
    
    @objc func settingsButtonTapped(_ sender: UIButton) -> Void {
        print("Settings Button Tapped")
        
        // haptic feedback
        let impactFeedbackgenerator = UIImpactFeedbackGenerator(style: .rigid)
        impactFeedbackgenerator.prepare()
        impactFeedbackgenerator.impactOccurred()

        // do something, such as
        let vc = SomeViewController()
        present(vc, animated: true, completion: nil)
    }
    
}

如果你真的想把触觉反馈放在你的自定义按钮中，你可以在touchesEnded中发送touchUpInside事件。如果触摸在按钮内部结束，您可能只想触发触觉反馈和“轻敲”事件。

以下是采用该方法的完整示例：

class CustomButton: UIButton {
    override init(frame: CGRect){
        super.init(frame: frame)
        setConfig()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setConfig()
    }
    func setConfig(){
        backgroundColor = UIColor(named: "SpecialGreen")
        layer.borderColor = UIColor.darkGray.cgColor
        layer.borderWidth = 1
        layer.cornerRadius = 5.0
        layer.zPosition = 2
        titleLabel?.font = UIFont(name: "PingFangSC-Semibold", size: 15)
    }
    func touchIn(){
        UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction,.curveEaseIn], animations: {
            self.transform = .init(scaleX: 0.9, y: 0.9)
        }, completion: nil)
    }
    func touchOut(){
        UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction,.curveEaseOut], animations: {
            self.transform = .identity
        }, completion: nil)
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        touchIn()
    }
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        touchOut()
        // only trigger haptic feedback and touchUpInside event
        //  if touches ended inside self
        if let touch = touches.first {
            let touchpoint:CGPoint = touch.location(in: self)
            if bounds.contains(touchpoint) {
                let impactFeedbackgenerator = UIImpactFeedbackGenerator(style: .rigid)
                impactFeedbackgenerator.prepare()
                impactFeedbackgenerator.impactOccurred()
                self.sendActions(for: UIControl.Event.touchUpInside)
            }
        }

    }
}

和(几乎相同的)示例视图控制器：

class CustViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let settingsbtn = CustomButton()
        settingsbtn.backgroundColor = .clear
        settingsbtn.layer.borderWidth = 0
        settingsbtn.frame = CGRect(x: view.bounds.size.width - 60, y: 60, width: 50, height: 50)
        settingsbtn.tintColor = UIColor.gray
        if let settingsImage = UIImage(systemName: "slider.horizontal.3") {
            settingsbtn.setImage(settingsImage, for: .normal)
        }
        settingsbtn.layer.zPosition = 2
        settingsbtn.tag = 5
        self.view.addSubview(settingsbtn)
        
        settingsbtn.addTarget(self, action: #selector(self.settingsButtonTapped), for: .touchUpInside)
        
    }
    
    @objc func settingsButtonTapped() -> Void {
        print("Settings Button Tapped")
        // do something, such as
        let vc = SomeViewController()
        present(vc, animated: true, completion: nil)
    }
    
}