toiavalle toiavalle - 1 month ago 17
Swift Question

Facebook login not working in swift

Im trying to implement Facebook login in my app but when I try to login it goes to Facebook app and comes back to my game but the login button doesn't become log out and if I try to get any information such as access token, granted permissions or declined permissions it is nil. this is the code I have:

import Foundation
class IntroScene: SKScene, FBSDKLoginButtonDelegate {
let loginButton: FBSDKLoginButton = {
let button = FBSDKLoginButton()
button.readPermissions = ["email"]
return button
}()

override func didMove(to view: SKView) {
self.backgroundColor = UIColor.black

view.addSubview(loginButton)
loginButton.center = (self.view?.center)!
loginButton.delegate = self
}

func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {

}

func loginButtonWillLogin(loginButton: FBSDKLoginButton!) -> Bool {
return true
}

func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
if(error == nil)
{
print("login complete")
//print(FBSDKAccessToken.current()) -> crashes because its nil
//print(result.grantedPermissions) -> crashes its nil
}
else{
print(error.localizedDescription)
}
}
}


my info.plist looks like following:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>UIViewControllerBasedStatusBarAppearance</key>
<false/>
<key>LSApplicationQueriesSchemes</key>
<array>
<string>fbapi</string>
<string>fb-messenger-api</string>
<string>fbauth2</string>
<string>fbshareextension</string>
</array>
<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<key>facebook.com</key>
<dict>
<key>NSIncludesSubdomains</key>
<true/>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
</dict>
<key>fbcdn.net</key>
<dict>
<key>NSIncludesSubdomains</key>
<true/>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
</dict>
<key>akamaihd.net</key>
<dict>
<key>NSIncludesSubdomains</key>
<true/>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
</dict>
</dict>
</dict>
<key>CFBundleURLTypes</key>
<array>
<dict>
<key>CFBundleURLSchemes</key>
<array>
<string>//fbmyid</string>
</array>
</dict>
</array>
<key>FacebookAppID</key>
<string>//myid</string>
<key>FacebookDisplayName</key>
<string>Crazy Traffic Saga</string>
<key>CFBundleDevelopmentRegion</key>
<string>en</string>
<key>CFBundleExecutable</key>
<string>$(EXECUTABLE_NAME)</string>
<key>CFBundleIdentifier</key>
<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>$(PRODUCT_NAME)</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIMainStoryboardFile</key>
<string>Main</string>
<key>UIRequiredDeviceCapabilities</key>
<array>
<string>armv7</string>
</array>
<key>UISupportedInterfaceOrientations</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationPortraitUpsideDown</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>




Answer

Thanks to this post: FB Login using Swift 3 not returning any values and not get back the user to the App after successful login I found the problem. There is one more function that should be added to App Delegate. Here is how I got Facebook login working

  • Download SDK and add to project

  • Set up info.plist according to Facebook website

  • In app delegate added:

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    FIRApp.configure()
    FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
    
    return true
    }
    
    public func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    
        return FBSDKApplicationDelegate.sharedInstance().application(
            app,
            open: url as URL!,
            sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
        annotation: options[UIApplicationOpenURLOptionsKey.annotation]
    )
    }
    
    public func application(_ application: UIApplication, open url: URL,     sourceApplication: String?, annotation: Any) -> Bool {
            return FBSDKApplicationDelegate.sharedInstance().application(
                application,
                open: url as URL!,
                sourceApplication: sourceApplication,
                annotation: annotation)
    }
    
  • In the SKScene I'm showing the button (could be in a view controller as well):

    class IntroScene: SKScene, FBSDKLoginButtonDelegate {
        override func didMove(to view: SKView) {
            self.backgroundColor = UIColor.black
            let loginButton = FBSDKLoginButton()
            loginButton.center = (self.view?.center)!
            self.view?.addSubview(loginButton)
            loginButton.frame = CGRect(x: 0, y: 0, width: 360, height: 60) // makes it bigger
            loginButton.center = CGPoint(x: self.frame.midX, y: self.frame.midY + 90)
            loginButton.delegate = self
            loginButton.readPermissions = ["public_profile", "email"]
            if let _ = FBSDKAccessToken.current(){
                //already logged in 
                fetchProfile()
            }
        }
        func fetchProfile() {
        let parameters = ["fields": "first_name, email, last_name, picture"]
    
        FBSDKGraphRequest(graphPath: "me", parameters: parameters).start(completionHandler: { (connection, user, requestError) -> Void in
    
            if requestError != nil {
                print("----------ERROR-----------")
                print(requestError)
                return
            }
            let userData = user as! NSDictionary
            let email = userData["email"] as? String
            let firstName = userData["first_name"] as? String
            let lastName = userData["last_name"] as? String
            var pictureUrl = ""
            if let picture = userData["picture"] as? NSDictionary, let data = picture["data"] as? NSDictionary, let url = data["url"] as? String {
                pictureUrl = url
                print(pictureUrl)
            }
         })
         }
    
    }
    
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