Swift -键入时更改TextView高度和宽度

import UIKit

class ViewController: UIViewController, UITextViewDelegate {
    @IBOutlet weak var textView: UITextView!
    @IBOutlet weak var textViewHeightConstraint: NSLayoutConstraint!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        textView.delegate = self
    }
    
    func textViewDidChange(_ textView: UITextView) {
        let newSize = textView.sizeThatFits(CGSize(width: textView.frame.width, height: CGFloat.greatestFiniteMagnitude))
        textViewHeightConstraint.constant = newSize.height
        // 如果需要调整宽度，也可以设置textView的宽度约束
        
        // 更新布局
        view.layoutIfNeeded()
    }
}