ios - 我已经评论了 saveContext 部分，它仍然保存在 coredata 中并显示保存的数据。它检查电子邮件验证，但仍然保存

Question

 let email  = capgEmailTextField.text
 func isEmailValid(str :String) -> Bool {
      let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z]+\\.[A-Za-z]{2,4}"
      let testMail = NSPredicate(format : "SELF MATCHES %@", emailRegEx)
      return testMail.evaluate(with : str)
            }
            
          
  if !isEmailValid(str: email!){
           
     print("Email is not valid")
                
     let alert = UIAlertController(title: "Note", message: "Email is not valid", preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "Okay", style: .cancel, handler: nil))
    present(alert, animated: true, completion: nil)
    }
  else if isEmailValid(str: email!){
     print("Emailvalid so m saving")
   do{
   //  AppDelegate.shared().saveContext()
       let alert = UIAlertController(title: "Note", message: "Details submitted", preferredStyle: .alert)
 alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
    present(alert, animated: true, completion: nil)
                    }

它进入 if 语句并检查条件，但仍然保存。不输入 else 语句。但是当保存上下文被评论时它被保存了所以我不知道它是如何被保存的