Facebook Login Swift - ios

Question

I wrote a basic Swift Class for Facebook login handling.
I want to check if the user already authorised the App, because in my case, the user gets asked everytime if he authorises the app - it switches to safari everytime instead of simply logging in. Sometimes the login completely fails - no error message, but also no success.
Here is my code:
class FacebookLogin{
private var data : NSMutableData? = nil
init(){
}
let facebookReadPermissions = ["public_profile", "email", "user_friends"]
func loginToFacebookWithSuccess(successBlock: () -> (), andFailure failureBlock: (NSError?) -> ()) {
if FBSDKAccessToken.currentAccessToken() != nil {
return
}
FBSDKLoginManager().logInWithReadPermissions(self.facebookReadPermissions, handler: { (result:FBSDKLoginManagerLoginResult!, error:NSError!) -> Void in
if error != nil {
// Process error
FBSDKLoginManager().logOut()
failureBlock(error)
} else if result.isCancelled {
// Handle cancellations
FBSDKLoginManager().logOut()
failureBlock(nil)
} else {
// If you ask for multiple permissions at once, you
// should check if specific permissions missing
var allPermsGranted = true
let grantedPermissions = Array(result.grantedPermissions).map( {"\($0)"} )
for permission in self.facebookReadPermissions {
if !contains(grantedPermissions, permission) {
allPermsGranted = false
break
}
}
if allPermsGranted {
// Do work
let fbToken = result.token.tokenString
let fbUserID = result.token.userID
println(fbUserID)
successBlock()
} else {
//The user did not grant all permissions requested
failureBlock(nil)
}
}
})
}
func login() -> Void{
if(self.alreadyLoggedIn() == false){
self.performLogin()
}else{
self.getFBUserData()
}
}
private func performLogin() -> Void {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager();
fbLoginManager.loginBehavior = FBSDKLoginBehavior.SystemAccount
println(FBSDKAccessToken.currentAccessToken())
fbLoginManager.logInWithReadPermissions(["email"], handler: { (result, error) -> Void in
if (error == nil){
var fbloginresult : FBSDKLoginManagerLoginResult = result
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
fbLoginManager.logOut()
}
}
})
}
private func alreadyLoggedIn() -> Bool {
if (FBSDKAccessToken.currentAccessToken() != nil)
{
return true
}else{
return false
}
}
private func getFBUserData() -> Void{
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){
println(result)
}
})
}
}
}
Thanks

Answer 1

In your view controller viewDidLoad() you can add this code :
if (FBSDKAccessToken.currentAccessToken() == nil)
{
// User is not already logged
println("No Logged")
}
else
{
// User is already logged
println("Already Logged")
}