This tutorial will guide you to create a simple app with a Signup and Login screen which takes username and password from the user and then posts it to an url and parse the JSON response. Its the same previous tutorial for Swift + Xcode 6, but the source code has been updated to Swift 2 using XCode 7 beta.
I will update the videos as needed.
We will have three view controllers for this project, Signup, Login and Home.
- Create a New project. And add the Screens and Segues/transitions.
- Home – Check for an existing session, else goto Login
- Login Screen – Post data to URL and parse the JSON response.
- Signup Screen – Post data to URL and parse the JSON response.
- Add Logout to Home Screen
1. Create a New project. And add the Screens and the Segue/transition.
I had issues with Xcode 6.1, not allowing me to create segue between View Controllers. Please see this video for an alternative way to do that:
2. Create Classes Properties And Methods:
Add code to viewDidAppear of HomeVC.swift
to check for existing login, if no session is found then show the login screen.
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(true)
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
let isLoggedIn:Int = prefs.integerForKey("ISLOGGEDIN") as Int
if (isLoggedIn != 1) {
self.performSegueWithIdentifier("goto_login", sender: self)
} else {
self.usernameLabel.text = prefs.valueForKey("USERNAME") as? String
}
}
signupTapped in SignupVC.swift:
@IBAction func signupTapped(sender : UIButton) {
let username:NSString = txtUsername.text!
let password:NSString = txtPassword.text!
let confirm_password:NSString = txtConfirmPassword.text!
if ( username.isEqualToString("") || password.isEqualToString("") ) {
let 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) ) {
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = "Passwords doesn't Match"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
} else {
do {
let post:NSString = "username=\(username)&password=\(password)&c_password=\(confirm_password)"
NSLog("PostData: %@",post);
let url:NSURL = NSURL(string: "https://dipinkrishna.com/jsonsignup.php")!
let postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
let postLength:NSString = String( postData.length )
let 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?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request, returningResponse:&response)
} catch let error as NSError {
reponseError = error
urlData = nil
}
if ( urlData != nil ) {
let res = response as! NSHTTPURLResponse!;
NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300)
{
let responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %@", responseData);
//var error: NSError?
let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers ) 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"
}
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = error_msg as String
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
let 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()
}
} catch {
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign Up Failed!"
alertView.message = "Server Error!"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
}
}
signinTapped in LoginVC.swift:
@IBAction func signinTapped(sender : UIButton) {
let username:NSString = txtUsername.text!
let password:NSString = txtPassword.text!
if ( username.isEqualToString("") || password.isEqualToString("") ) {
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Please enter Username and Password"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
} else {
do {
let post:NSString = "username=\(username)&password=\(password)"
NSLog("PostData: %@",post);
let url:NSURL = NSURL(string:"https://dipinkrishna.com/jsonlogin2.php")!
let postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
let postLength:NSString = String( postData.length )
let 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?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request, returningResponse:&response)
} catch let error as NSError {
reponseError = error
urlData = nil
}
if ( urlData != nil ) {
let res = response as! NSHTTPURLResponse!;
NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300)
{
let responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %@", responseData);
//var error: NSError?
let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary
let success:NSInteger = jsonData.valueForKey("success") as! NSInteger
//[jsonData[@"success"] integerValue];
NSLog("Success: %ld", success);
if(success == 1)
{
NSLog("Login SUCCESS");
let 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"
}
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = error_msg as String
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
let 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()
}
} catch {
let alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Server Error"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
}
}
logoutTapped in HomeVC.swift
@IBAction func logoutTapped(sender : UIButton) {
let appDomain = NSBundle.mainBundle().bundleIdentifier
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain!)
self.performSegueWithIdentifier("goto_login", sender: self)
}
Checkout the end result of the tutorial:
Download the full source code using the link below:
It contains the xcode project, php code and the sql file for the whole project.
Hi Mansour,
All the tutorials I have are pretty much outdated. My last tutorial was in 2015.
I just got my blog back up a few days ago. I will be writing new tutorials soon.
Sorry for the trouble.
Thanks,
Dipin
dear
i am try to learn IOS application i am using Xcode9.1 i try to follow this lesson but i have problem when i reach to LoginVC.swift i try to add new referencing outlet, i cannot i find this message “could not insert new outlet connection: could not find any information for the class named LoginVC”
why this happens i am try to apply your tutorial step by step.
Please check you server logs. Thanks.
When I run your code using my server , I get connection field with code = 500
what might be the problem ?
You’re awesome! Thank you so much.
FInaly working tutorial!!!
I managed to connect app with our rest API swift2 with little changes to what I need.
Thank you so much!
Thanks. “Forgot Password” is an added feature. You can add it. 🙂
Hi,
Great tutorial, well coded.
Thanks you a lot you saved our lives 😉
Though, there is one more thing is missing which is ‘Forgot Password’.
It will be great if you add this feature in your code.
This will complete the App and I guess its essential.
Regards