键盘出现时调整UITextView大小

// 监听键盘出现和隐藏的通知
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)

// 键盘将要出现时的回调函数
@objc func keyboardWillShow(_ notification: Notification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        // 调整UITextView的大小
        let newTextViewHeight = self.view.frame.height - keyboardSize.height - 20 // 假设键盘底部距离屏幕底部的间距为20
        self.textView.frame.size.height = newTextViewHeight
    }
}

// 键盘将要隐藏时的回调函数
@objc func keyboardWillHide(_ notification: Notification) {
    // 恢复UITextView的原始大小
    self.textView.frame.size.height = originalTextViewHeight
}