I'm working on a school project to build an instagram-like app and the first thing we want to do is to create a user login & signup page. My group mate has created a database but I have problems connecting with his database.
Here are the source codes that I found online (https://dipinkrishna.com/blog/2014/07/login-signup-screen-tutorial-xcode-6-swift-ios-8-json/):
import UIKit
class SigninViewController: UIViewController {
//Declare the two textfield objects here
@IBOutlet weak var txtUsername: UITextField!
@IBOutlet weak var txtPassword: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//When the signin button is clicked, the following function will run
@IBAction func signinTapped(sender: UIButton) {
var username:NSString = txtUsername.text
var password:NSString = txtPassword.text
if ( username.isEqualToString("") || password.isEqualToString("") ) {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in failed!"
alertView.message = "Please enter Username and Password"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
} else {
var post:NSString = "username=\(username)&password=\(password)"
NSLog("PostData: %@",post);
//var url:NSURL = NSURL(string:"https://dipinkrishna.com/jsonlogin2.php")!
var url:NSURL = NSURL(string:"http://php-kingpendragon.rhcloud.com/index.php")!
var postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
var postLength:NSString = String( postData.length )
var request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: NSURLResponse?
var urlData: NSData? = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&reponseError)
if ( urlData != nil ) {
let res = response as! NSHTTPURLResponse!;
NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300)
{
var responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %@", responseData);
var error: NSError?
let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &error) as! NSDictionary
let success:NSInteger = jsonData.valueForKey("success") as! NSInteger
//[jsonData[@"success"] integerValue];
NSLog("Success: %ld", success);
if(success == 1)
{
NSLog("Login SUCCESS");
var prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
prefs.setObject(username, forKey: "USERNAME")
prefs.setInteger(1, forKey: "ISLOGGEDIN")
prefs.synchronize()
//self.dismissViewControllerAnimated(true, completion: nil)
} else {
var error_msg:NSString
if jsonData["error_message"] as? NSString != nil {
error_msg = jsonData["error_message"] as! NSString
} else {
error_msg = "Unknown Error"
}
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = error_msg as String
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Connection Failure"
if let error = reponseError {
alertView.message = (error.localizedDescription)
}
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
return true
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
For the signup page:
import UIKit
class SignupViewController: UIViewController {
@IBOutlet weak var txtUsername: UITextField!
@IBOutlet weak var txtPassword: UITextField!
@IBOutlet weak var txtConfirmPassword: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
//When user clicks signin button
@IBAction func gotoSignIn(sender: UIButton) {
self.dismissViewControllerAnimated(true, completion: nil)
}
//When user clicks signup button
@IBAction func signupTapped(sender: UIButton) {
var username:NSString = txtUsername.text as NSString
var password:NSString = txtPassword.text as NSString
var confirm_password:NSString = txtConfirmPassword.text as NSString
if ( username.isEqualToString("") || password.isEqualToString("") ) {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = "Please enter Username and Password"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
} else if ( !password.isEqual(confirm_password) ) {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = "Passwords don't match"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
} else {
var post:NSString = "username=\(username)&password=\(password)&c_password=\(confirm_password)"
NSLog("PostData: %@",post);
//var url:NSURL = NSURL(string: "https://dipinkrishna.com/jsonsignup.php")!
var url:NSURL = NSURL(string: "http://php-kingpendragon.rhcloud.com/index.php")!
var postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
var postLength:NSString = String( postData.length )
var request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: NSURLResponse?
var urlData: NSData? = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&reponseError)
if ( urlData != nil ) {
let res = response as! NSHTTPURLResponse!;
NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300)
{
var responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %@", responseData);
var error: NSError?
let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &error) as! NSDictionary
let success:NSInteger = jsonData.valueForKey("success") as! NSInteger
//[jsonData[@"success"] integerValue];
NSLog("Success: %ld", success);
if(success == 1)
{
NSLog("Sign Up SUCCESS");
self.dismissViewControllerAnimated(true, completion: nil)
} else {
var error_msg:NSString
if jsonData["error_message"] as? NSString != nil {
error_msg = jsonData["error_message"] as! NSString
} else {
error_msg = "Unknown Error"
}
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = error_msg as String
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Connection Failure"
if let error = reponseError {
alertView.message = (error.localizedDescription)
}
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
}
}
func textFieldShouldReturn(textField: UITextField!) -> Bool { //delegate method
textField.resignFirstResponder()
return true
}
}
Then here is the index.php quoted in the above codes.
<?php
/**
* File to handle all API requests
* Accepts GET and POST
*
* Each request will be identified by TAG
* Response will be JSON data
/**
* check for POST request
*/
if (isset($_POST['tag']) && $_POST['tag'] != '') {
// get tag
$tag = $_POST['tag'];
// include db handler
require_once 'DB_Functions.php';
$db = new DB_Functions();
// response Array
$response = array("tag" => $tag, "error" => FALSE);
// check for tag type
if ($tag == 'login') {
// Request type is check Login
$email = $_POST['email'];
$password = $_POST['password'];
// check for user
$user = $db->getUserByEmailAndPassword($email, $password);
if ($user != false) {
// user found
$response["error"] = FALSE;
$response["uid"] = $user["unique_id"];
$response["user"]["name"] = $user["name"];
$response["user"]["email"] = $user["email"];
$response["user"]["created_at"] = $user["created_at"];
$response["user"]["updated_at"] = $user["updated_at"];
echo json_encode($response);
} else {
// user not found
// echo json with error = 1
$response["error"] = TRUE;
$response["error_msg"] = "Incorrect email or password!";
echo json_encode($response);
}
} else if ($tag == 'register') {
// Request type is Register new user
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
// check if user is already existed
if ($db->isUserExisted($email)) {
// user is already existed - error response
$response["error"] = TRUE;
$response["error_msg"] = "User already existed";
echo json_encode($response);
} else {
// store user
$user = $db->storeUser($name, $email, $password);
if ($user) {
// user stored successfully
$response["error"] = FALSE;
$response["uid"] = $user["unique_id"];
$response["user"]["name"] = $user["name"];
$response["user"]["email"] = $user["email"];
$response["user"]["created_at"] = $user["created_at"];
$response["user"]["updated_at"] = $user["updated_at"];
echo json_encode($response);
} else {
// user failed to store
$response["error"] = TRUE;
$response["error_msg"] = "Error occured in Registartion";
echo json_encode($response);
}
}
} else {
// user failed to store
$response["error"] = TRUE;
$response["error_msg"] = "Unknow 'tag' value. It should be either 'login' or 'register'";
echo json_encode($response);
}
} else {
$response["error"] = TRUE;
$response["error_msg"] = "Required parameter 'tag' is missing!";
echo json_encode($response);
}
?>
Lastly, here is the Xcode error msg:
2015-08-20 18:24:29.145 IG[66106:1443683] PostData: username=bbbb&password=bbb 2015-08-20 18:24:29.961 IG[66106:1443683] Response code: 200 2015-08-20 18:24:29.961 IG[66106:1443683] Response ==> {"error":true,"error_msg":"Required parameter 'tag' is missing!"} fatal error: unexpectedly found nil while unwrapping an Optional value
I should reference the tag for "login" and "register" in the SigninViewController and SignupViewController classes but I don't know how. Also, it seems that I have made some values null. Anyone can help?
