最近在做學校專題，目前正在製作登入的頁面，目前遇到的問題是swift連接php 無論輸入正確或錯誤的帳號或密碼 都會接收到Account does not exists的回覆，想請問我的php或swift是哪裡出了問題了嗎？ 先謝謝大家的回覆

<?php

	$servername = "XXX";
	$username = "XXX";
	$password = "XXX";
	$dbname = "XXX";


	$loginAccount = @$_POST["loginAccount"];
	$loginPass = @$_POST["loginPass"];
		
	$conn = new mysqli($servername, $username, $password, $dbname);

    if($conn->connect_error){
		die("Connection Failed:" . $conn->connect_error);
	}
	$sql = "SELECT * FROM member_list WHERE Account = '".$loginAccount."' " ;
	$result = $conn->query($sql);

	if ($result->num_rows > 0){

		while($row = $result->fetch_assoc()){
			if($row["Pass"] == $loginPass){
				echo "Login Success.";
			}        
			else{
				echo "Wrong Password or Account.";
			}
		}
	}
	else {
		echo "Account does not exists" ;
	}
	$conn->close();

?>

以下是swift

@IBAction func LoginButton(_ sender: Any) {
        let userAccount = userAccountTextField.text!
        let userPassword = userPasswordTextField.text!
                
        if (userAccount.isEmpty)==true   {
            let controller = UIAlertController(title: "", message: "請輸入帳號", preferredStyle: .alert)
               let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
               controller.addAction(okAction)
               present(controller, animated: true, completion: nil)
            }
        if (userPassword.isEmpty)==true   {
        let controller = UIAlertController(title: "", message: "請輸入密碼", preferredStyle: .alert)
           let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
           controller.addAction(okAction)
           present(controller, animated: true, completion: nil)
        }
            
        let myUrl = NSURL(string: "http://************.php")
        
        let request = NSMutableURLRequest(url : myUrl! as URL);
      
    request.httpMethod = "POST";
        
        let postString = "loginAccount\(userAccount)&loginPass=\(userPassword)"
        request.httpBody = postString.data(using: String.Encoding.utf8);
        
        let task = URLSession.shared.dataTask(with: request as URLRequest){
            data , response , error in
            
            if error != nil {
                print("error=\(String(describing: error))")
                return
            }
            print("response =\(postString) ")
            let responseString = NSString(data: data!,encoding: String.Encoding.utf8.rawValue)
            //print("loginAccount=\(postString)")
            print("responseString =\(responseString) ")
        }
        task.resume()
        
    }
}