How to get user email id from Facebook - swift

Question

Why can't I get user mail id for Facebook? I have attached my code below. I have doubt in login and registration using API
func getFacebookUserInfo() {
if(FBSDKAccessToken.current() != nil)
{
//print permissions, such as public_profile
print(FBSDKAccessToken.current().permissions)
let graphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields" : "id, first_name, last_name, email"])
let connection = FBSDKGraphRequestConnection()
connection.add(graphRequest, completionHandler: { (connection, result, error) -> Void in
let data = result as! [String : AnyObject]
self.firstnameLabel.text = data["first_name"] as? String
self.lastnameLabel.text = data["last_name"] as? String
guard let result = result as? NSDictionary else{ return }
let email = result["email"] as? String
self.googleemail = email!
let FBid = data["id"] as? String
let url = NSURL(string: "https://graph.facebook.com/\(FBid)/picture?type=large&return_ssl_resources=1")
self.imageView.image = UIImage(data: NSData(contentsOf: url! as URL)! as Data)
self.validateUserData()
})
connection.start()
}
}

Answer 1

facebook button click
#IBAction func btnFacebookClick(_ sender: Any)
{
// GeneralClass.startProgress()
loginManager.logIn(readPermissions: [ ReadPermission.publicProfile,ReadPermission.email], viewController: self) { (loginResult) in
switch loginResult {
case .failed(let error):
self.loginManager.logOut()
print(error)
case .cancelled:
self.loginManager.logOut()
print("User cancelled login.")
case .success(let grantedPermissions, let declinedPermissions, let accessToken):
print(grantedPermissions)
print(declinedPermissions)
print("Logged in!")
self.getFBUserData(accessToken: accessToken)
}
}
}
get data
func getFBUserData(accessToken: AccessToken)
{
let request = GraphRequest(graphPath: "me",
parameters: ["fields" : "first_name,middle_name,last_name,name,link,email,id,picture" as AnyObject],
accessToken:accessToken,
httpMethod: .GET)
request.start { (httpResponse, result) in
switch result {
case .success(let response):
let responseDictionary = response.dictionaryValue
print("USER DATA:---\(responseDictionary! as NSDictionary))")
let dicData = responseDictionary! as NSDictionary
if ((dicData["email"]) != nil) {
let email = dicData["email"] as! String
let user_firstName = dicData["first_name"] as! String
let imageUrl = (((dicData["picture"] as! NSDictionary)[KEY_DATA] as! NSDictionary)["url"] as! String)
}
case .failed(let error):
self.loginManager.logOut()
print(error)
}
}
}

Answer 2

Seems like the email value is nil. Set nil checking before assigning the value.
if let email = result["email"] as? String {
self.googleemail = email!
}
Hope this will help.