UIButton手势在子视图控制器中无法识别。UIButton添加目标工作（按钮获取目标操作）用户交互在任何地方都打开，按钮大小正常。我尝试将childVC设置为主视图，然后一切正常，调试视图层次结构时说按钮视图超过其他元素。IDK哪里有问题。我可以提供更多代码，请告诉我。
添加目标代码：

view.buttonOfLanguageFromTranslate.addTarget(self, action: #selector(self.openDetailView(_:)), for: .touchDown)

添加下级VC代码：

let childVC = ChildVC()
    view.addSubview(childVC.view)
    
    self.addChild(childVC)
    childVC.didMove(toParent: self)
    
    childVC.view.translatesAutoresizingMaskIntoConstraints = false
    self.view.isUserInteractionEnabled = true
    self.childVC = childVC

按钮初始化：

var button: UIButton = {
    let button = UIButton()
    button.setTitle("Title", for: .normal)
    button.setTitleColor(.black, for: .normal)
    button.setTitleColor(.green, for: .selected)
    button.translatesAutoresizingMaskIntoConstraints = false
    return button
}()