Swift 键盘弹出时按钮点击未响应的坑

这里介绍一个非常神奇的坑
键盘弹出时点击背景按钮未响应，这边情况特殊在键盘弹出后，点击按钮颜色有变，但是点击事件却没有响应，一开始以为是IQKeyboardManagerSwift的坑，调试了半天跟这个没关系。后来各种方法尝试一下找到了解决方法。

var deleteButton: UIButton = {
    let button = UIButton(type: .custom)
    button.addTarget(self, action: #selector(deleteAction(_:)), for: .touchUpInside)
    return button
}()
override init(frame: CGRect) {
    super.init(frame: frame)
    setup()
}
required init?(coder: NSCoder) {
    super.init(coder: coder)
    setup()
}
// MARK: - Private
private func setup() {
    self.addSubview(deleteButton)
    deleteButton.snp.makeConstraints { make in
        make.width.equalTo(50)
        make.height.equalTo(40)
        make.top.right.equalToSuperview()
    }
}
// MARK: - Action
@objc func deleteAction(_ sender: UIButton) {
    emptySearchHistoryClosure?()
}

解决方法：把存储属性改为延迟存储属性
总结：应该是我代码的编写方式比较奇特，不然应该不会出现这种神奇的bug

lazy var deleteButton: UIButton = {
    let button = UIButton(type: .custom)
    button.addTarget(self, action: #selector(deleteAction(_:)), for: .touchUpInside)
    return button
}()
// MARK: - Action
@objc func deleteAction(_ sender: UIButton) {
    emptySearchHistoryClosure?()
}