如何在 "return data" 之后添加函数

Question

我有一个问题，我的程序可以运行但某些代码无法运行。没有错误，但它有一个警告标志说“return 之后的代码将不会执行”。我想在这方面提供帮助。谢谢

@IBAction func newBookTapped(_ sender: Any) {
   guard let uid = Auth.auth().currentUser?.uid,
          let data = bookData() else { 
      return
   }

   db.collection("new reading").document(uid).setData(data)
}
            
        
func bookData() -> [String: Any]? {
   guard let title = bookTitleTextField.text,
         let author = bookAuthorTextField.text,
         let summary = bookSummaryTextField.text else {
      return nil
   }

   let data: [String: Any] = [
      "bookTitle": title,
      "bookAuthor": author,
      "bookSummary": summary
    ]
                
    return data
        
    self.transitionToMenu()
}
    
    
func transitionToMenu() {
   let alert = UIAlertController(title: nil, message: "Book has been saved!", preferredStyle:  .alert)
   alert.view.alpha = 0.5
   alert.view.layer.cornerRadius = 15
   self.present(alert, animated: true)
   DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2) {
      if let navController = self.navigationController {
          navController.popViewController(animated: true)
      } else {
          self.dismiss(animated: true, completion: {})
      }
   }
}

My program photo

Answer 1

在创建 return 时，您结束函数并返回调用，因此无法执行函数中 return 之后的任何内容。

您必须将 self.transitionToMenu() 放在 return data 之前。

如何在 "return data" 之后添加函数

How to add function after the "return data"

swift

xcode

mobile-application