Ios 将数据传回VC时委托为空

以下是我以编程方式使用委托示例.代码将消息从一个视图传递到另一个视图控制器.我有两个视图SendMessageController和Receive Message控制器.它正在传回数据的场景.

协议在SendMessageController中定义.

protocol SendMessageDelegate: AnyObject {
    func message(text: String)
}
final class SendMessageController: UIViewController {
        
    weak var delegate: SendMessageDelegate?
    
    

    @objc func button() {
        sendMessage()  
    }

    func sendMessage() {
       let message = “Hello World”
       delegate?.message(text: message)
       print("Delegate is :\(delegate)")
       print("self:\(self)")   
} 

在显示接收消息的消息视图控制器中:

final class ShowMessageController: UIViewController,SendMessageDelegate {
     
    let sendMessageController = SendMessageController() 
     
    override func viewDidLoad() {
        sendMessageController.delegate = self
        print("\(sendMessageController)")
    }
    
    func message(text: String) {
        print(“The message is:\(text)”)
             
    }       
}
  

委托打印空，并且print(self)的内存地址不同于print("(sendMessageController)"). 我以前用过委托，SendVC的内存地址都是一样的，不知道这是怎么回事.