Login function with activity indicator - ios

Question

I am currently doing a login test and have to log in again to log in. After pressing the login button to send the request to the server, the activity indicator is displayed on the screen until the activity indicator is stopped and the activity indicator is stopped The next page, I would like to open another thread used to implement the activity indicator, but I do not know how to implement, please help!
And this code is modified from http://www.kaleidosblog.com/how-to-create-a-login-screen-page-in-swift-3-authenticate-an-user-and-keep-the-session-active.
class ViewController: UIViewController {
let login_url = "http://www.kaleidosblog.com/tutorial/login/api/Login"
let checksession_url = "http://www.kaleidosblog.com/tutorial/login/api/CheckSession"
#IBOutlet var username_input: UITextField!
#IBOutlet var password_input: UITextField!
#IBOutlet var login_button: UIButton!
var login_session:String = ""
var activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)
override func viewDidLoad() {
super.viewDidLoad()
username_input.text = "try#me.com"
password_input.text = "test"
activityIndicator.hidesWhenStopped = true;
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray;
activityIndicator.center = view.center;
let preferences = UserDefaults.standard
if preferences.object(forKey: "session") != nil
{
login_session = preferences.object(forKey: "session") as! String
check_session()
}
}
#IBAction func DoLogin(_ sender: AnyObject) {
login_now(username:username_input.text!, password: password_input.text!)
}
#IBAction func backToMain(_ segue:UIStoryboardSegue){
let preferences = UserDefaults.standard
preferences.removeObject(forKey: "session")
self.dismiss(animated: true, completion: nil)
}
func login_now(username:String, password:String)
{
let post_data: NSDictionary = NSMutableDictionary()
post_data.setValue(username, forKey: "username")
post_data.setValue(password, forKey: "password")
let url:URL = URL(string: login_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
var paramString = ""
for (key, value) in post_data
{
paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
}
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let data_block = server_response["data"] as? NSDictionary
{
if let session_data = data_block["session"] as? String
{
self.login_session = session_data
let preferences = UserDefaults.standard
preferences.set(session_data, forKey: "session")
DispatchQueue.main.async {
self.view.addSubview(self.activityIndicator)
}
}
}
})
task.resume()
LoginDone()
}
func check_session()
{
let post_data: NSDictionary = NSMutableDictionary()
post_data.setValue(login_session, forKey: "session")
let url:URL = URL(string: checksession_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
var paramString = ""
for (key, value) in post_data
{
paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
}
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let response_code = server_response["response_code"] as? Int
{
if(response_code == 200)
{
DispatchQueue.main.async {
self.view.addSubview(self.activityIndicator)
}
}
else
{
}
}
})
task.resume()
}
func LoginDone()
{
self.performSegue(withIdentifier: "gotomenu", sender: nil)
}
func startActivityIndicator(){
activityIndicator.startAnimating()
}
func stopActivityIndicator() {
activityIndicator.stopAnimating()
}
}

Answer 1

Try to use SVProgressHUD. It's the simplest framework, that I have ever seen. SVProgressHUD on GitHub
Install:
In your podfile:
pod 'SVProgressHUD'
Then in terminal:
pod install
How to use:
import SVProgressHUD
to start:
SVProgressHUD.show()
to dismiss:
SVProgressHUD.dismiss()
Its very simple and usefull. Just try it.
Hope it helps

Answer 2

Replace this code code with old code:
class ViewController: UIViewController {
let login_url = "http://www.kaleidosblog.com/tutorial/login/api/Login"
let checksession_url = "http://www.kaleidosblog.com/tutorial/login/api/CheckSession"
#IBOutlet var username_input: UITextField!
#IBOutlet var password_input: UITextField!
#IBOutlet var login_button: UIButton!
var login_session:String = ""
var activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)
override func viewDidLoad() {
super.viewDidLoad()
username_input.text = "try#me.com"
password_input.text = "test"
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
activityIndicator.center = view.center
activityIndicator.isHidden = true
self.view.addSubview(self.activityIndicator)
let preferences = UserDefaults.standard
if preferences.object(forKey: "session") != nil
{
login_session = preferences.object(forKey: "session") as! String
check_session()
}
}
#IBAction func DoLogin(_ sender: AnyObject) {
login_now(username:username_input.text!, password: password_input.text!)
}
#IBAction func backToMain(_ segue:UIStoryboardSegue){
startActivityIndicator()
activityIndicator.isHidden = false
let preferences = UserDefaults.standard
preferences.removeObject(forKey: "session")
self.dismiss(animated: true, completion: nil)
stopActivityIndicator()
activityIndicator.isHidden = true
}
func login_now(username:String, password:String)
{
activityIndicator.isHidden = false
startActivityIndicator()
let post_data: NSDictionary = NSMutableDictionary()
post_data.setValue(username, forKey: "username")
post_data.setValue(password, forKey: "password")
let url:URL = URL(string: login_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
var paramString = ""
for (key, value) in post_data
{
paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
}
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
self.stopActivityIndicator()
self.activityIndicator.isHidden = true
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let data_block = server_response["data"] as? NSDictionary
{
if let session_data = data_block["session"] as? String
{
self.login_session = session_data
let preferences = UserDefaults.standard
preferences.set(session_data, forKey: "session")
DispatchQueue.main.async {
self.LoginDone()
}
}
}
})
task.resume()
}
func check_session()
{
let post_data: NSDictionary = NSMutableDictionary()
post_data.setValue(login_session, forKey: "session")
let url:URL = URL(string: checksession_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
var paramString = ""
for (key, value) in post_data
{
paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
}
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let response_code = server_response["response_code"] as? Int
{
if(response_code == 200)
{
DispatchQueue.main.async {
self.view.addSubview(self.activityIndicator)
}
}
else
{
}
}
})
task.resume()
}
func LoginDone()
{
self.performSegue(withIdentifier: "gotomenu", sender: nil)
}
func startActivityIndicator(){
activityIndicator.startAnimating()
}
func stopActivityIndicator() {
activityIndicator.stopAnimating()
}
}