I made a login trough the facebook in my app using the Facebook SDK. Basically I have a login screen that when the user clicks in "Facebook" button it make whole auth routine (open the safari and ask for accept the permission). When the user is not logged after accept the access to app it goes to another view (Main screen of app).
The problem is when the user is already logged... I would like open the app in main screen without display login view.
I'm verifying if user is logger in LoginController at viewDidAppear and calling performSegueWithIdentifier method because in viewDidLoad it doesn't work.
Which is the best way to make a login screen?
class LoginViewController: UIViewController{
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
override func viewDidLoad() {
}
override func viewDidAppear(animated: Bool) {
print("Will Appear method")
if (self.defaults.stringForKey("isLogged") != nil){
self.performSegueWithIdentifier("facebookLoginSegue", sender: nil)
}
}
//MARK - Actions
#IBAction func facebookLogin(sender: UIButton) {
FBSDKLoginManager().logInWithReadPermissions(["public_profile", "email", "user_friends"], fromViewController:self, handler: { (result:FBSDKLoginManagerLoginResult!, error:NSError!) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if(fbloginresult.grantedPermissions.contains("email")){
self.defaults.setBool(true, forKey: "isLogged")
self.getFBUserData()
}
}
})
}
func getFBUserData(){
if((FBSDKAccessToken.currentAccessToken()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).startWithCompletionHandler({ (connection, result, error) -> Void in
if (error == nil){
print(result)
}
})
}
}
}
I thought about verify the user "session" in AppDelegate and change the rootViewController of storyboard. Is it a good practice or a crazy idea?
Can someone help me?
I found a way:
First set the main screen as root view in storyboard
Second step is verify if the user is logged in AppDelegate.
If the user is not logged show change root view controller to login view.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
if (self.defaults.stringForKey("isLogged") == nil){
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewControllerWithIdentifier("LoginViewController")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
}
return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
}
And finishing, add a segue from login view to Main view with specific identifier... and when the user successfully login call self.performSegueWithIdentifier("segueIdentifier", sender: nil)
if (self.defaults.stringForKey("isLogged") != nil){
self.performSegueWithIdentifier("facebookLoginSegue", sender: nil)
}
Related
I've integrated cognito into my xcode project. The sign up/password update features are working correctly. However I can't seem to get the sign in process to work. I turned on the logs and I get the following error
{"__type":"NotAuthorizedException","message":"Access Token has expired"}
Domain=com.amazonaws.AWSCognitoIdentityProviderErrorDomain Code=-1000 "Authentication delegate not set" UserInfo={NSLocalizedDescription=Authentication delegate not set}]
I have also implemented the AWSCognitoIdentityInteractiveAuthenticationDelegate delegate in the AppDelegate script.
Here's the AppDelegate code
class AppDelegate: UIResponder, UIApplicationDelegate {
class func defaultUserPool() -> AWSCognitoIdentityUserPool {
return AWSCognitoIdentityUserPool(forKey: userPoolID)
}
var window: UIWindow?
var loginViewController: LoginVC?
var navigationController: UINavigationController?
var storyboard: UIStoryboard?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
// Warn user if configuration not updated
if (CognitoIdentityUserPoolId == "us-east-1_TavWWBZtI") {
let alertController = UIAlertController(title: "Invalid Configuration",
message: "Please configure user pool constants in Constants.swift file.",
preferredStyle: .alert)
let okAction = UIAlertAction(title: "Ok", style: .default, handler: nil)
alertController.addAction(okAction)
self.window?.rootViewController!.present(alertController, animated: true, completion: nil)
//print("Please configure user pool constants in Constants.swift file.")
}
// setup logging
AWSDDLog.sharedInstance.logLevel = .verbose
AWSDDLog.add(AWSDDTTYLogger.sharedInstance)
// setup service configuration
let serviceConfiguration = AWSServiceConfiguration(region: CognitoIdentityUserPoolRegion, credentialsProvider: nil)
// create pool configuration
let poolConfiguration = AWSCognitoIdentityUserPoolConfiguration(clientId: CognitoIdentityUserPoolAppClientId,
clientSecret: CognitoIdentityUserPoolAppClientSecret,
poolId: CognitoIdentityUserPoolId)
// initialize user pool client
AWSCognitoIdentityUserPool.register(with: serviceConfiguration, userPoolConfiguration: poolConfiguration, forKey: AWSCognitoUserPoolsSignInProviderKey)
// fetch the user pool client we initialized in above step
let pool = AWSCognitoIdentityUserPool(forKey: AWSCognitoUserPoolsSignInProviderKey)
self.storyboard = UIStoryboard(name: "Main", bundle: nil)
pool.delegate = self
return AWSMobileClient.sharedInstance().interceptApplication(
application, didFinishLaunchingWithOptions:
launchOptions)
//return true
}
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
if let navigationController = self.window?.rootViewController as? UINavigationController {
if navigationController.visibleViewController is SummaryReportVC ||
navigationController.visibleViewController is GoalStatusReportVC || navigationController.visibleViewController is YearTotalsReportVC || navigationController.visibleViewController is DailyActivityReportVC {
return UIInterfaceOrientationMask.all
} else {
return UIInterfaceOrientationMask.portrait
}
}
return UIInterfaceOrientationMask.portrait
}
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}
extension AppDelegate: AWSCognitoIdentityInteractiveAuthenticationDelegate {
func startPasswordAuthentication() -> AWSCognitoIdentityPasswordAuthentication {
print("Calling signin VC from app delegate")
if (self.navigationController == nil) {
self.navigationController = self.storyboard?.instantiateViewController(withIdentifier: "NCFirst") as? UINavigationController
}
if (self.loginViewController == nil) {
self.loginViewController = self.navigationController?.viewControllers[0] as? LoginVC
}
DispatchQueue.main.async {
self.navigationController!.popToRootViewController(animated: true)
if (!self.navigationController!.isViewLoaded
|| self.navigationController!.view.window == nil) {
self.window?.rootViewController?.present(self.navigationController!,
animated: true,
completion: nil)
}
}
return self.loginViewController!
}
}
Here's my LoginVC code
class LoginVC: UIViewController {
#IBOutlet weak var loginButton: UIButton!
#IBOutlet weak var forgotPasswordLabel: UILabel!
#IBOutlet weak var signUpLabel: UILabel!
#IBOutlet weak var emailTF: UITextField!
#IBOutlet weak var passwordTF: UITextField!
var passwordAuthenticationCompletion: AWSTaskCompletionSource<AWSCognitoIdentityPasswordAuthenticationDetails>?
let pool = AWSCognitoIdentityUserPool(forKey: AWSCognitoUserPoolsSignInProviderKey)
var usernameText: String?
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.tintColor = UIColor.white
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
self.navigationController!.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController!.navigationBar.shadowImage = UIImage()
self.navigationController!.navigationBar.isTranslucent = true
loginButton.addTarget(self, action: #selector(loginUser), for: .touchUpInside)
loginButton.layer.cornerRadius = 18
emailTF.addPadding(.left(35))
passwordTF.addPadding(.left(35))
let tap = UITapGestureRecognizer(target: self, action: #selector(goToForgotPasswordVC))
let tap2 = UITapGestureRecognizer(target: self, action: #selector(goToSignUp1VC))
forgotPasswordLabel.isUserInteractionEnabled = true
forgotPasswordLabel.addGestureRecognizer(tap)
signUpLabel.isUserInteractionEnabled = true
signUpLabel.addGestureRecognizer(tap2)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.passwordTF.text = nil
self.emailTF.text = usernameText
}
#objc func loginUser() {
print("Got inside Login func")
if (self.emailTF.text != nil && self.passwordTF.text != nil) {
print("Calling login method now")
let authDetails = AWSCognitoIdentityPasswordAuthenticationDetails(username: self.emailTF.text!, password: self.passwordTF.text! )
self.passwordAuthenticationCompletion?.set(result: authDetails)
} else {
print("Empty fields")
let alertController = UIAlertController(title: "Missing information",
message: "Please enter a valid user name and password",
preferredStyle: .alert)
let retryAction = UIAlertAction(title: "Retry", style: .default, handler: nil)
alertController.addAction(retryAction)
}
}
#objc func goToActivitySessionsVC() {
let storyboard = UIStoryboard(name: "TabBar", bundle: nil)
let destVC = storyboard.instantiateViewController(withIdentifier: "TabBarVC")
self.navigationController?.pushViewController(destVC, animated: true)
self.navigationController?.isNavigationBarHidden = true
}
#objc func goToForgotPasswordVC() {
let storyboard = UIStoryboard(name: "ForgotPassword", bundle: nil)
let destVC = storyboard.instantiateViewController(withIdentifier: "ForgotPasswordVC")
self.navigationController?.pushViewController(destVC, animated: true)
}
#objc func goToSignUp1VC() {
let storyboard = UIStoryboard(name: "SignUp", bundle: nil)
let destVC = storyboard.instantiateViewController(withIdentifier: "SignUp1VC")
self.navigationController?.pushViewController(destVC, animated: true)
}
/* func checkLoginStatus() {
if !AWSSignInManager.sharedInstance().isLoggedIn {
showSignIn()
}
else {
print("Logged In")
AWSSignInManager.sharedInstance().logout(completionHandler: {(result: Any?, error: Error?) in
self.showSignIn()
print("Sign-out Successful");
})
}
}
}
*/
extension LoginVC: AWSCognitoIdentityPasswordAuthentication {
public func getDetails(_ authenticationInput: AWSCognitoIdentityPasswordAuthenticationInput, passwordAuthenticationCompletionSource: AWSTaskCompletionSource<AWSCognitoIdentityPasswordAuthenticationDetails>) {
print("Get details called")
self.passwordAuthenticationCompletion = passwordAuthenticationCompletionSource
DispatchQueue.main.async {
if (self.usernameText == nil) {
self.usernameText = authenticationInput.lastKnownUsername
}
}
}
public func didCompleteStepWithError(_ error: Error?) {
print("Did commplete step with error called")
DispatchQueue.main.async {
if let error = error as NSError? {
let alertController = UIAlertController(title: error.userInfo["__type"] as? String,
message: error.userInfo["message"] as? String,
preferredStyle: .alert)
let retryAction = UIAlertAction(title: "Retry", style: .default, handler: nil)
alertController.addAction(retryAction)
self.present(alertController, animated: true, completion: nil)
print(error.description)
} else {
self.emailTF.text = nil
self.dismiss(animated: true, completion: nil)
print("Got in else")
}
}
}
}
One other thing to note is that getDetails never gets called and so does the didCompleteStepWithError method. When I click the sign in button, nothing happens.
The AWS documentation is quite confusing. After much trial and error, I was able to successfully set up Cognito, sign up, authenticate on log in, and un-authenticate on sign out. To be quite honest, I don't fully understand why I call certain things. To the best of my ability, I will explain here.
Here's how Cognito works.. First it assumes that the user is already logged in and authenticated. It checks to see if this is true. This is the reason why the entry point for your storyboard is the view controller that users see after they are logged in. This is all done with the code that runs in your AppDelegate on launch. More on what you need to fix in that below.
If the user is not logged in, startPasswordAuthentication() will be called. In your code, (as it should be) this defined in the extension of AppDelegate for the protocol AWSCognitoIdentityInteractiveAuthenticationDelegate. Furthermore, startPasswordAuthentication() is called every time the user needs to log in. If the user is already logged in once the app starts, this is not called.
Another note on your question - getDetails is only called on launch if the user is not signed in. If on launch the user is not signed in, then this is called. It is also called if you are signed in and then you sign out.
So make sure the entry point for your storyboard is the logged-in screen.
On the statement that follows I am not entirely sure, so feel free to correct me if so: AWS automatically accesses the entry point upon successful log-in. Everything you are going in your #objc func loginUser() looks correct to me. That's what I have. But make sure your entry point is not the log-in screen but rather what shows after successful log in. Here is a picture of my storyboard:
Try adding the following. I am not quite sure why exactly this works, but it results in proper authentication:
In your AppDelegate, right after your variable for the storyboard, add a boolean isInitialized as such:
var isInitialized : Bool = false
Then add this code after you set up your Cognito configuration. (right before your return statement in didFinishLaunchingWithOptions) :
let didFinishLaunching = AWSSignInManager.sharedInstance().interceptApplication(application, didFinishLaunchingWithOptions: launchOptions)
if (!self.isInitialized) {
AWSSignInManager.sharedInstance().resumeSession(completionHandler: { (result: Any?, error: Error?) in
print("Result: \(String(describing: result)) \n Error:\(String(describing: error))")
})
self.isInitialized = true
}
Now replace the return statement you currently have for didFinishLaunching with the following:
return didFinishLaunching
Make sure you have this delegate set in your viewDidLoad() method for your login screen (Note you have to import AWSAuthCore):
AWSSignInManager.sharedInstance().delegate = self
and implement the protocol in your log-in VC as such:
extension LoginViewController : AWSSignInDelegate {
func onLogin(signInProvider: AWSSignInProvider, result: Any?, error: Error?) {
if error == nil {
}
}
}
Add these variables as class variables to your view controller that users see after they are logged in. They are referenced below.
var user : AWSCognitoIdentityUser?
var userAttributes : [AWSCognitoIdentityProviderAttributeType]?
/*
* :name: defaultUserPool
* :description: Returns the cognito identity pool for the global pool ID.
* :return: A Cognito Identity pool instantiation
*/
class func defaultUserPool() -> AWSCognitoIdentityUserPool {
return AWSCognitoIdentityUserPool(forKey: userPoolID)
}
Finally, make sure that you are checking the user attributes in the initial screen in viewWillAppear(). For example call the function fetchUserAttributes in this method:
func fetchUserAttributes() {
self.user = AppDelegate.defaultUserPool().currentUser()
self.user?.getDetails().continueOnSuccessWith(block: { [weak self = self] (task) -> Any? in
AWSSignInManager.sharedInstance().resumeSession(completionHandler: { (result: Any?, error: Error?) in
print("Result: \(String(describing: result)) \n Error:\(String(describing: error))")
})
guard task.result != nil else {
// alert error
return nil
}
self?.username = self?.user?.username
self?.userAttributes = task.result?.userAttributes
self?.userAttributes?.forEach({ (attribute) in
print("Name: " + attribute.name!)
})
DispatchQueue.main.async {
self?.setAttributeValues()
}
}
return nil
})
}
func resetAttributeValues() {
self.user = nil
self.userAttributes = nil
}
Finally, here is my code for signing out:
let comp = { [weak self = self] (_ result: Any?, _ error: Error?) -> Void in
if error == nil {
self?.user?.signOut()
self?.resetAttributeValues()
self?.fetchUserAttributes()
}
}
AWSSignInManager.sharedInstance().logout(completionHandler: comp)
I hope this helps. I understand this is really confusing, and to be honest, I was quite confused just writing this.. Good luck and feel free to message me with any questions.
You need to call getDetails.
In the sample app, they call getDetails in UserDetailTableViewController.
Try this line of code below pool.delegate = self in AppDelegate.
self.pool?.currentUser()?.getDetails()
I referred AWS Cognito User Pools in iOS (Swift) app
I am trying to perform a segue on successful login in swift 3. Once my web service returns success message I want to perform segue. I am trying the same in the following manner:
DispatchQueue.main.sync(execute: {
print("Login successful")
self.performSegue(withIdentifier: "goToTimerPage", sender: self)
})
My log is printing fine.
Please help me with this. I am new to web services.
use like this
DispatchQueue.main.sync(execute: {
print("Login successful")
self.performSegue(withIdentifier: "goToTimerPage", sender: self)
})
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goToTimerPage" {
//present your view controller or do some code
}
Simple way for navigation.
Setup your didFinishLaunchingWithOptions like this way.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let storyboard :UIStoryboard
if UIDevice.currentDevice().userInterfaceIdiom == .Pad{
storyboard = UIStoryboard(name: "Main_iPad", bundle: nil)
}
else{
storyboard = UIStoryboard(name: "Main", bundle: nil)
}
let navigationController:UINavigationController = storyboard.instantiateInitialViewController() as! UINavigationController
let objLoginViewController:UIViewController = storyboard.instantiateViewControllerWithIdentifier("ID_LoginViewController") as! LoginViewController
navigationController.viewControllers = [objLoginViewController]
if self.window != nil {
self.window!.rootViewController = navigationController
}
return true
}
Call this function once get successful response.
self.redirectToNewViewcontroller()
Code for redirectToNewViewcontroller function
func redirectToNewViewcontroller()
{
let objNewViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ID_NewViewController") as? NewViewController
self.navigationController?.pushViewController(objNewViewController!, animated: true)
}
simply make sure you embed your view controller in a navigation controller
the source view controller not the destination view controller
I'm trying to pass a property to my next VC using prepareforSegue. It is called, however my other VC does not load.
Original
#IBAction func onSignupPressed(sender: AnyObject) {
FBSDKLoginManager().logInWithReadPermissions(permissions,
fromViewController: self) { result, error in
guard error == nil else { print("Login Error"); return }
guard result.grantedPermissions.contains("email") else {
print("No Email Permissions"); return }
self.getFBUserData()
dispatch_async(dispatch_get_main_queue()) {
self.performSegueWithIdentifier("loginSegue", sender: self)
}
}
}
I've been able to get the next VC showing by doing calling my doLogin function below. And there I instantiate a VC from the storyboard and present it. I believe it is due to the timing of the Facebook login window that pops up and closes. I searched for a delegate method, but have not found anything
#IBAction func onSignupPressed(sender: AnyObject) {
FBSDKLoginManager().logInWithReadPermissions(permissions,
fromViewController: self) { result, error in
guard error == nil else { print("Login Error"); return }
guard result.grantedPermissions.contains("email") else {
print("No Email Permissions"); return }
self.getFBUserData()
dispatch_async(dispatch_get_main_queue()) {
self.performSegueWithIdentifier("loginSegue", sender: self)
}
}
}
func getFBUserData(){
let params = "id, name, first_name, last_name, picture.type(large),friends, email, birthday, work, photos, education, location, hometown, religion, likes, about"
if((FBSDKAccessToken.currentAccessToken()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields":params]).startWithCompletionHandler({ (connection, result, error) -> Void in
if (error == nil){
//everything works print the user data
print(result)
let resultdict = result as? NSDictionary
self.user = Mapper<User>().map(result)
self.doLogin()
}
})
}
}
func doLogin() {
let successVC = self.storyboard?.instantiateViewControllerWithIdentifier("LoginSucessViewController")
self.presentViewController(successVC!, animated: true, completion: nil)
}
Very silly mistake! Didn't realize I could simply set the property of instantiating the VC!
func doLogin() {
let successVC = self.storyboard?.instantiateViewControllerWithIdentifier("LoginSucessViewController") as! LoginSucessViewController
successVC.currentUser = user
self.presentViewController(successVC, animated: true, completion: nil)
}
I am trying to customize the Facebook login button after following this guide. Everything is integrated correctly, I can login to Facebook, and logout without a hitch.
Now my next goal is to make the screen look like my mock up, this includes placing the login button correctly on the storyboard, but the only issue is that it doesn't show up on the story board, it just appears when I run the simulation. I looked at other overflow answers, but they weren't really helpful as they were geared towards earlier versions of swift / Xcode, and didn't work from what the comments said. My code is exactly the same as the guide, as this is the first screen that I am trying to implement.
Help would be much appreciated.
If you want to use the custom facebook SDK button you can create any custom button in the storyboard and provide action in the viewcontroller like this
Import at top
import FBSDKCoreKit
import FBSDKLoginKit
Swift 3:
#IBAction func loginFacebookAction(sender: AnyObject) {//action of the custom button in the storyboard
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.logIn(withReadPermissions: ["email"], from: self) { (result, error) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result!
// if user cancel the login
if (result?.isCancelled)!{
return
}
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
}
}
}
}
func getFBUserData(){
if((FBSDKAccessToken.current()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).start(completionHandler: { (connection, result, error) -> Void in
if (error == nil){
//everything works print the user data
print(result)
}
})
}
}
Older Swift version:
#IBAction func loginFacebookAction(sender: AnyObject) {//action of the custom button in the storyboard
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.logInWithReadPermissions(["email"], fromViewController: self) { (result, error) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
}
}
}
}
func getFBUserData(){
if((FBSDKAccessToken.currentAccessToken()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).startWithCompletionHandler({ (connection, result, error) -> Void in
if (error == nil){
//everything works print the user data
print(result)
}
})
}
}
If you want default facebook login button you can take UIView and set Class* field of the Custom Class** section in the Identity Inspector, we must set the FBLoginValue
Ref: Default SDK login button tutorial:http://www.appcoda.com/ios-programming-facebook-login-sdk/
Ref: Custom SDK login button for parameters and more info:https://developers.facebook.com/docs/facebook-login/ios
POD INSTALL
source 'https://github.com/CocoaPods/Specs.git'
use_frameworks!
target “ProjectName” do
pod 'FacebookCore'
pod 'FacebookLogin'
pod 'FacebookShare'
end
AppDelegate.swift
import FacebookLogin
import FBSDKLoginKit
import FacebookCore
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
return true
}
func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application, open: url, sourceApplication: sourceApplication, annotation: annotation)
}
ViewController.swift
import UIKit
import FacebookLogin
import FBSDKLoginKit
import FacebookCore
class ViewController: UIViewController {
override func viewDidLoad() {
if(FBSDKAccessToken.current() == nil){
print("Not logged in ")
}else{
print("Logged in already")
getFacebookUserInfo()
}
}
#IBAction func CustomButton_Click(_ sender: Any) {
getFacebookUserInfo()
}
func getFacebookUserInfo(){
let loginManager = LoginManager()
loginManager.logIn([.publicProfile, .email ], viewController: self) { (result) in
switch result{
case .cancelled:
print("Cancel button click")
case .success:
let params = ["fields" : "id, name, first_name, last_name, picture.type(large), email "]
let graphRequest = FBSDKGraphRequest.init(graphPath: "/me", parameters: params)
let Connection = FBSDKGraphRequestConnection()
Connection.add(graphRequest) { (Connection, result, error) in
let info = result as! [String : AnyObject]
print(info["name"] as! String)
}
Connection.start()
default:
print("??")
}
}
}
}
Info.plist
Info.plist --> right click ->OpenAs -->Source Code --> add < dict > .. < /dict >
<key>CFBundleURLTypes</key>
<array>
<dict>
<key>CFBundleURLSchemes</key>
<array>
<string>YOUR APP ID</string>
</array>
</dict>
</array>
<key>FacebookAppID</key>
<string>YOUR APP ID</string>
<key>FacebookDisplayName</key>
<string>YOUR APP NAME</string>
#IBAction func buttonLogin(_ sender: Any) {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.logIn(withReadPermissions: ["public_profile","email"], from: self) { (result, error) in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result!
if fbloginresult.grantedPermissions != nil {
if(fbloginresult.grantedPermissions.contains("email")) {
if((FBSDKAccessToken.current()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).start(completionHandler: { (connection, result, error) -> Void in
if (error == nil){
let dict: NSDictionary = result as! NSDictionary
if let token = FBSDKAccessToken.current().tokenString {
print("tocken: \(token)")
let userDefult = UserDefaults.standard
userDefult.setValue(token, forKey: "access_tocken")
userDefult.synchronize()
}
if let user : NSString = dict.object(forKey:"name") as! NSString? {
print("user: \(user)")
}
if let id : NSString = dict.object(forKey:"id") as? NSString {
print("id: \(id)")
}
if let email : NSString = (result! as AnyObject).value(forKey: "email") as? NSString {
print("email: \(email)")
}
}
})
}
}
}
}
}
}
Welcome to StackOverflow, Shika! That tutorial shows you how to add the button that Facebook provides as part of their SDK. The tutorial tells you centers the button in the center of the device's screen. Facebook allows you to create your own button, if you'd like to. In my opinion, I like it better, because you can play with it in the storyboard, unlike the button created programmatically in Swift. You can use the Facebook docs here and scroll down to "Custom Login Button". Your code will change, but not by much! If you choose to go this route, make sure to delete the code you copied and pasted to add the button located in viewDidLoad. Also, you can delete the FBSDKLoginButtonDelegate you added at the top of the Swift file.
I am developing an iOS App that has several Tabs. So I decided my root view Controller will be a Tab Bar Controller with 2 views.
I need the user to login as soon as the application starts, so I'm trying to find out the best approach to do this.
Following other similar questions posted here I've tried this 2 approaches:
Presenting the login screen as a Modal View on top of the Tab Bar Controller
Instantiating the Login view controller
I've done this, by using a UserisLoggedIn flag in NSUserDefaults that is set every time the user logs in or logs out.
The problem I face with both approaches is that before the login screen appears there's a quick flickr of the first view in the Tab Bar.
I've tried to resolve this setting the alpha value of the Tab Bar to 0 if the user is not logged in for the modal approach, but for the instance approach it doesnt work, it still flickers before showing the login screen. Anyway, I find this solution tedious and not really elegant.
There must be a standard approach for doing this in iOS, since you have loads of apps that present first a login screen, but since I am a beginner with iOS Programming I still don't know how to do it.
Here's some code from my Tab bar controller:
1st Approach
Tab Bar Controller
override func viewDidLoad() {
super.viewDidLoad()
view.alpha = 0
let defaults = NSUserDefaults.standardUserDefaults()
if defaults.objectForKey("userLoggedIn") as NSString == "loggedIn"{
view.alpha = 1.0
}
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(false)
self.showLoginView()
}
func showLoginView(){
let defaults = NSUserDefaults.standardUserDefaults()
if defaults.objectForKey("userLoggedIn") == nil{
self.performSegueWithIdentifier("loginView", sender: self)
}
}
Login View Controller
func updateUserLoggedInFlag() {
// Update the NSUserDefaults flag
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject("loggedIn", forKey: "userLoggedIn")
defaults.synchronize()
}
#IBAction func login(sender: AnyObject) {
//Do my login here...
//If login successful:
self.performSegueWithIdentifier("dismissLogin", sender: self)
}
2nd Approach, Creating an Instance of the Login View Controller
1st View in the Tab Bar
override func viewDidAppear(animated: Bool){
super.viewDidAppear(true)
let defaults = NSUserDefaults.standardUserDefaults()
if defaults.objectForKey("userLoggedIn") == nil{
let loginController: LoginViewController = self.storyboard?.instantiateViewControllerWithIdentifier("LoginViewController") as LoginViewController
self.tabBarController?.presentViewController(loginController, animated: false, completion: nil)
}
Login View Controller
#IBAction func login(sender: AnyObject) {
//Do my login here...
//If login successful:
self.dismissViewControllerAnimated(true, completion: nil)
}
OK here is what did the trick for me. I don't know if it's the right thing to do, but it seems to work. Like Joseph Duffy mentioned all I did was to set the Login view as the rootviewcontroller in the delegate, and once I was succesfully logged in, switch back to the tab bar controller as rootviewcontroller.
Code in AppDelegate:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let defaults = NSUserDefaults.standardUserDefaults()
if defaults.objectForKey("userLoggedIn") == nil{
showLogin()
}
}
func showLogin() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let loginViewController = storyboard.instantiateViewControllerWithIdentifier("LoginViewController") as LoginViewController
self.window?.makeKeyAndVisible()
self.window?.rootViewController = loginViewController
}
Code in LoginViewController
#IBAction func login(sender: AnyObject) {
//Do my login here...
//If login successful:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let appDelegate: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
self.dismissViewControllerAnimated(true, completion: nil)
appDelegate.window?.rootViewController = storyboard.instantiateViewControllerWithIdentifier("tabBarID") as TabBarController
}
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let defaults = NSUserDefaults.standardUserDefaults()
if defaults.objectForKey("userLoggedIn") == nil{
showLoginView()
}
func showLoginView(){
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let loginViewController: LoginViewController = storyboard.instantiateViewControllerWithIdentifier("LoginViewController") as LoginViewController
self.window?.makeKeyAndVisible()
self.window?.rootViewController?.presentViewController(loginViewController, animated: true, completion: nil)
}
Take a look at a similar question's answer. The solution is to do this check in your app delegate's application:didFinishLaunchingWithOptions: method by checking if the user is logged in and loading the login view from a storyboard when necessary.
I have created a blank project, added a view controller with a storyboard identifier of loginScreen and have the following code in the app delegate:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
self.showLogin()
return true
}
func showLogin() {
//loginScreen
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let loginViewController = storyboard.instantiateViewControllerWithIdentifier("loginScreen") as UIViewController
if let window = self.window {
window.makeKeyAndVisible()
window.rootViewController?.presentViewController(loginViewController, animated: false, completion: nil)
}
}
This shows the login screen and the main screen is not seen.