限制UITextview的行数

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let textView = UITextView()
        textView.frame = CGRect(x: 20, y: 100, width: 280, height: 100)
        textView.backgroundColor = .lightGray
        self.view.addSubview(textView)

        // 限制UITextView的行数
        textView.textContainer.maximumNumberOfLines = 3

        // 设置其他属性
        textView.font = UIFont.systemFont(ofSize: 16)
        textView.isEditable = false
        textView.text = "这是一个示例文本，用于演示如何限制UITextView的行数。"
    }
}