Facebook Login not working in IOS SDK - ios

Question

I am struggling with the issue of Facebook login, Yesterday Facebook login working correctly but today when I run my app it's not working don't know why, why it's not working suddenly I already configured all things related to Facebook login in Facebook develop console everything is configured
Please help me out if you have any idea, I already enable Keychain sharing also.
Code for Facebook Login
#IBAction func onClickFacebookLoginAction(_ sender: Any) {
var message = String()
if Reachability.isConnectedToNetwork() == true{
let loginView:FBSDKLoginManager = FBSDKLoginManager()
loginView.loginBehavior = FBSDKLoginBehavior.web
loginView.logIn(withReadPermissions: ["email","public_profile","user_friends"], from: self, handler: { (result, error) in
if(error != nil){
print("Error while try to login with facebook-\(error?.localizedDescription)")
}else if (result?.isCancelled)!{
print("User cancel the facebook login")
}else{
if result?.grantedPermissions != nil{
if (result?.grantedPermissions .contains("email"))!{
self.ShowProgressHUD()
self.fetchUserInfo()
}else{
message = message.appending("Facebook email permission error")
self.showAlertMessage(message: message, title: "")
}
}
}
})
}
}
func fetchUserInfo() -> Void {
if (FBSDKAccessToken.current() != nil) {
let graphRequest:FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "/me", parameters:["fields": "id, first_name, last_name, name, email, picture"])
graphRequest.start(completionHandler: { (connection, result, error) in
if(error != nil){
self.showAlertMessage(message: (error?.localizedDescription)!, title: "")
}
else
{
print("Result is:\(result)")
self.dictionary = result as! [String : AnyObject]
let name = self.dictionary["name"] as!String
let email = self.dictionary["email"] as! String
let token = FBSDKAccessToken.current().tokenString
print("name is -\(name)")
print("email is -\(email)")
print("token is -\(token)")
DispatchQueue.main.async {
let SelectionViewObj = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
self.navigationController?.pushViewController(SelectionViewObj, animated: true)
}
}
})
}
}

Answer 1

This is the code i am using to authenticate facebook.its working like a charm.Just check or replace with this.
self.fbLoginManager = FBSDKLoginManager.init()
fbLoginManager.loginBehavior = FBSDKLoginBehavior.web
self.fbLoginManager.logIn(withReadPermissions: ["email"], from: self) { (result, error) -> Void in
if (error == nil) {
let fbloginresult : FBSDKLoginManagerLoginResult = result!
if fbloginresult.grantedPermissions != nil && fbloginresult.grantedPermissions.contains("email") {
if((FBSDKAccessToken.current()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"id, first_name, last_name, email, gender, birthday, location"]).start(completionHandler: { (connection, result, error) -> Void in
if error != nil {
print(error?.localizedDescription ?? "error in facebook login...!")
return
}
if let dict = result as? NSDictionary {
print("facebook login result --->\n\(dict)")
guard let id = dict["id"] else {
print("Ooops... id = nil")
return
}
// let firstName: String = dict["first_name"] as? String ?? ""
// let lastName : String = dict["last_name"] as? String ?? ""
// let email : String = dict["email"] as? String ?? ""
self.fbLoginManager.logOut()
}
})
}
} else {
print("facebook ---> login canceled")
}
} else {
print(error?.localizedDescription ?? "facebook login has error")
}
}

Answer 2

This is how I used to log in with Facebook,
#IBAction func act_loginFB(_ sender: UIButton) {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.logIn(withReadPermissions: ["public_profile", "email",], from: self) { (result, error) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result!
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)
let data: [String:AnyObject] = (result as? [String : AnyObject])!
print(data)
let email: String = data["email"]! as! String
print(email)
}
})
}
}
Check you added the correct FacebookAppID and FacebookDisplayName in the info.plist