Swift 监听键盘弹出和收回

注册通知

        // 注册键盘即将出现通知
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        // 注册键盘即将隐藏通知
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)

监听事件

    /// 监听键盘即将出现事件
    @objc func keyboardShow(_ noti: Notification) {
        App.log("键盘即将出现")
        let info = noti.userInfo
        let kbRect = (info?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
        UIView.animate(withDuration: 0.2) {
            self.transform = CGAffineTransform(translationX: 0, y: -(kbRect?.size.height ?? 0) / 2)
        }
    }
    
    /// 监听键盘即将隐藏事件
    @objc func keyboardHide(_ noti: Notification) {
        App.log("键盘即将隐藏")
        UIView.animate(withDuration: 0.2) {
            self.transform = CGAffineTransform(translationX: 0, y: 0)
        }
    }
  

移除通知

        // 移除键盘监听
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)