当文本包含回车符时，滚动到UITextView的末尾

class ViewController: UIViewController, UITextViewDelegate {
    @IBOutlet weak var textView: UITextView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        textView.delegate = self
    }
    
    func textViewDidChange(_ textView: UITextView) {
        let contentHeight = textView.contentSize.height
        let visibleHeight = textView.bounds.height
        
        if contentHeight > visibleHeight {
            let bottomOffset = CGPoint(x: 0, y: contentHeight - visibleHeight)
            textView.setContentOffset(bottomOffset, animated: true)
        }
    }
}