iMessage扩展中未调用textView()方法

import UIKit
import Messages

class MessagesViewController: MSMessagesAppViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 调用textView()方法创建文本视图
        let textView = UITextView()
        textView.text = "Hello, iMessage!"
        textView.font = UIFont.systemFont(ofSize: 16)
        textView.textColor = UIColor.black
        
        // 将文本视图添加到视图层次结构中
        view.addSubview(textView)
        
        // 设置文本视图的布局约束
        textView.translatesAutoresizingMaskIntoConstraints = false
        textView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        textView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        textView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        textView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    }
    
    // 其他代码...
}