Swift UIKit中UIButton点击区域过小问题如何解决？

你的PassButton本身没有设置明确的尺寸约束，也未正确配置按钮的内在内容尺寸。虽然你添加了70x80的UIImageView作为背景，但按钮自身的可点击区域（hitTest范围）仅为系统默认的极小尺寸，只有ImageView覆盖到的左上角小部分与该区域重叠，因此只有那部分能响应点击。

以下几种方式均可修复，按需选择：

方式一：给按钮添加明确宽高约束 #

在configPassButton方法中，为按钮添加与ImageView匹配的宽高约束：

func configPassButton() {
    passButton = PassButton()
    guard let passButton = passButton else { return }
    view.addSubview(passButton)
    passButton.translatesAutoresizingMaskIntoConstraints = false
    passButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20).isActive = true
    passButton.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 20).isActive = true
    // 添加宽高约束，匹配ImageView的70x80尺寸
    passButton.widthAnchor.constraint(equalToConstant: 70).isActive = true
    passButton.heightAnchor.constraint(equalToConstant: 80).isActive = true
}

方式二：让按钮内在尺寸匹配ImageView #

将ImageView改为类属性，并重写intrinsicContentSize返回其尺寸，按钮会自动以此确定自身大小：

class PassButton: UIButton {

    var videoVC: VideoGameVC?
    private let imageViewBackground = UIImageView(frame: CGRect(x:0, y:0, width: 70, height: 80))
    
    required init(isEnabled: Bool = false) {
        super.init(frame: .zero)
        
        self.isEnabled = true
        self.addTarget(self, action: #selector(pressed(_:)), for: .touchUpInside)

        imageViewBackground.image = UIImage(named: "pass_button")
        imageViewBackground.contentMode = UIView.ContentMode.scaleAspectFill
        addSubview(imageViewBackground)
        sendSubviewToBack(imageViewBackground)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override var intrinsicContentSize: CGSize {
        return imageViewBackground.frame.size
    }
    
    @objc func pressed(_ sender: UIButton) {
        print("presovan")
    }
}

更规范的优化方式：直接使用按钮内置图片API #

无需手动添加UIImageView，利用UIButton的setBackgroundImage方法设置背景图，按钮会自动处理尺寸与点击区域：

class PassButton: UIButton {

    var videoVC: VideoGameVC?
    
    required init(isEnabled: Bool = false) {
        super.init(frame: .zero)
        
        self.isEnabled = true
        self.addTarget(self, action: #selector(pressed(_:)), for: .touchUpInside)
        // 直接设置按钮背景图
        let backgroundImage = UIImage(named: "pass_button")
        self.setBackgroundImage(backgroundImage, for: .normal)
        // 如需调整内边距可设置contentEdgeInsets
        // self.contentEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc func pressed(_ sender: UIButton) {
        print("presovan")
    }
}

内容的提问来源于stack exchange，提问作者The Outstanding Question Asker