Swift/MySQL/PHP“缺少必需参数”错误

Question

这是我注册用户的快捷方式：

//Information fields
@IBOutlet weak var user: UITextField!
@IBOutlet weak var pass: UITextField!
@IBOutlet weak var pass2: UITextField!
@IBOutlet weak var name: UITextField!
@IBOutlet weak var email: UITextField!
@IBOutlet weak var Message: UILabel!


//Register button
@IBAction func register(_ sender: Any) {

    let Parameters = ["username": user.text, "password": pass.text, "email": email.text, "name": name.text]

    let url = URL(string: "http://cgi.soic.indiana.edu/~lvweiss/prof4/register.php")!

    let session = URLSession.shared

    var request = URLRequest(url: url)
    request.httpMethod = "POST"

    do {
        request.httpBody = try JSONSerialization.data(withJSONObject: Parameters, options: .prettyPrinted)
    } catch let error {
        print(error.localizedDescription)
        Message.text = String(error.localizedDescription)
    }

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in

        guard error == nil else {
            return
        }

        guard let data = data else {
            return
        }

        do {
            if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
                print(json)
                }
        } catch let error {
            print(error.localizedDescription)
            self.Message.text = String(error.localizedDescription)
        }
    })
    task.resume()
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

这里是 PHP：

<?php
require_once 'DbOperation.php';

$response = array();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
if (!verifyRequiredParams(array('username', 'password', 'email', 'name'))) {
    //getting values
    $username = $_POST['username'];
    $password = $_POST['password'];
    $email = $_POST['email'];
    $name = $_POST['name'];

    //creating db operation object
    $db = new DbOperation();

    //adding user to database
    $result = $db->createUser($username, $password, $email, $name);

    //making the response accordingly
    if ($result == USER_CREATED) {
        $response['error'] = false;
        $response['message'] = 'User created successfully';
    } elseif ($result == USER_ALREADY_EXIST) {
        $response['error'] = true;
        $response['message'] = 'User already exist';
    } elseif ($result == USER_NOT_CREATED) {
        $response['error'] = true;
        $response['message'] = 'Some error occurred';
    }
} else {
    $response['error'] = true;
    $response['message'] = 'Required parameters are missing';
}
} else {
$response['error'] = true;
$response['message'] = 'Invalid request';
}

//function to validate the required parameter in request
function verifyRequiredParams($required_fields)
{

//Looping through all the parameters
foreach ($required_fields as $field) {
    //if any requred parameter is missing
    if (!isset($_POST[$field]) || strlen(trim($_POST[$field])) <= 0) {

        //returning true;
        return true;
    }
}
return false;
}

echo json_encode($response);
?>

这是我要发布到数据库的信息： iOS 注册字段：

点击注册按钮时我从 Xcode 收到的错误：

2017-11-14 00:42:01.529344-0500 WeissProf4[8754:662299] [MC] 延迟加载 NSBundle MobileCoreServices.framework
2017-11-14 00:42:01.530670-0500 WeissProf4[8754:662299] [MC] 加载 MobileCoreServices.framework
2017-11-14 00:42:01.550941-0500 WeissProf4[8754:662299] [MC] systemgroup.com.apple.configurationprofiles 路径的系统组容器是 /Users/leviweiss/Library/Developer/CoreSimulator/Devices/C98EE410-1CA2 -4B4B-9ED8-A4F112C629E2/data/Containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2017-11-14 00:42:03.468653-0500 WeissProf4[8754:662299] [MC] 从私人有效用户设置中读取。
2017-11-14 00:42:04.769899-0500 WeissProf4[8754:662505] [MC] 缓存无效
2017-11-14 00:42:05.281372-0500 WeissProf4[8754:662299] [MC] 从私人有效用户设置中读取。
[“消息”：缺少必需的参数，“错误”：1]

我不确定发生了什么，我知道 PHP 已成功连接到数据库并且能够发布所需的信息（使用 Postman 测试）。我认为 Swift 如何处理 PHP 中的发布可能是一个错误，尽管我绝对不是 PHP 专家。

Answer 1

解决方案 Swift4：

@IBAction func register(_ sender: Any) {

let request = NSMutableURLRequest(url: NSURL(string: "http://cgi.soic.indiana.edu/~lvweiss/prof4/register.php")! as URL)
request.httpMethod = "POST"
let postString = "username=\(user.text!)&password=\(pass.text!)&email=\(email.text!)&name=\(name.text!)"
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 = \(String(describing: response))")

    let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
    print("responseString = \(String(describing: responseString))")
}
task.resume()

}