如何为动态增长的UITextView设置最小高度？

import UIKit

class ViewController: UIViewController, UITextViewDelegate {
    @IBOutlet weak var textView: UITextView!
    
    let minHeight: CGFloat = 100 // 设置最小高度
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        textView.delegate = self
        textView.textContainerInset = UIEdgeInsets(top: 8, left: 8, bottom: 8, right: 8) // 设置文本内边距
        textView.layer.borderWidth = 1 // 设置边框宽度
        textView.layer.borderColor = UIColor.lightGray.cgColor // 设置边框颜色
    }
    
    func textViewDidChange(_ textView: UITextView) {
        let size = textView.sizeThatFits(CGSize(width: textView.frame.width, height: CGFloat.greatestFiniteMagnitude))
        let height = max(size.height, minHeight) // 获取文本内容高度，并与最小高度进行比较
        
        textView.frame.size.height = height // 设置UITextView的高度
    }
}