I have created a sample app where User logs in using Facebook Login button.
Once logged in I display User's Name and Email on Login screen. It was working with Swift 2.3. Once I migrated to Swift 3, it stopped working.
- Step1: Login with Facebook Login Button
- Step2: Allow permissions for email and profile
- Step3: Here it should go back to screen 1. But it doesn't. Attaching the Log I get when I click "Ok" button.
Update 1: App runs fine on iOS 9.3. The issue occurs only on iOS 10 devices.
2016-06-19 08:30:09.300070 MyApp[13942:1214112] [] nw_endpoint_handler_start [4 graph.facebook.com:443 initial path (null)]
2016-06-19 08:30:09.300484 MyApp[13942:1214112] [] nw_connection_endpoint_report [4 graph.facebook.com:443 initial path (null)] reported event path:start
2016-06-19 08:30:09.301255 MyApp[13942:1214112] [] nw_connection_endpoint_report [4 graph.facebook.com:443 waiting path (satisfied)] reported event path:satisfied
2016-06-19 08:30:09.302664 MyApp[13942:1214112] [] nw_connection_endpoint_report [4 graph.facebook.com:443 in_progress resolver (satisfied)] reported event resolver:start_dns
2016-06-19 08:30:09.348956 MyApp[13942:1214130] [] nw_endpoint_resolver_update [4 graph.facebook.com:443 in_progress resolver (satisfied)] Adding endpoint handler for 31.13.79.246:443
2016-06-19 08:30:09.349570 MyApp[13942:1214130] [] nw_connection_endpoint_report [4 graph.facebook.com:443 in_progress resolver (satisfied)] reported event resolver:receive_dns
2016-06-19 08:30:09.350027 MyApp[13942:1214130] [] nw_endpoint_resolver_start_next_child [4 graph.facebook.com:443 in_progress resolver (satisfied)] starting child endpoint 31.13.79.246:443
2016-06-19 08:30:09.350564 MyApp[13942:1214130] [] nw_host_stats_add_src recv too small, received 24, expected 28
2016-06-19 08:30:09.351022 MyApp[13942:1214130] [] nw_endpoint_resolver_start_next_child [4 graph.facebook.com:443 in_progress resolver (satisfied)] starting next child endpoint in 250ms
2016-06-19 08:30:09.351479 MyApp[13942:1214130] [] nw_endpoint_handler_start [4.1 31.13.79.246:443 initial path (null)]
2016-06-19 08:30:09.351862 MyApp[13942:1214130] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 initial path (null)] reported event path:start
2016-06-19 08:30:09.352596 MyApp[13942:1214130] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 waiting path (satisfied)] reported event path:satisfied
2016-06-19 08:30:09.352915 MyApp[13942:1214130] [] __nwlog_err_simulate_crash_libsystem libsystem simulate crash unavailable, [libsystem_network.dylib: nw_endpoint_get_hostname :: incorrect endpoint type 1]
2016-06-19 08:30:09.353524 MyApp[13942:1214130] [] nw_endpoint_get_hostname incorrect endpoint type 1, dumping backtrace:
[x86_64] libnetcore-805.0.0.2.2
0 libsystem_network.dylib 0x000000011186037f __nw_create_backtrace_string + 123
1 libsystem_network.dylib 0x000000011186246e nw_endpoint_get_hostname + 75
2 libnetwork.dylib 0x0000000112bc4be7 nw_endpoint_proxy_handler_should_use_proxy + 125
3 libnetwork.dylib 0x0000000112bd204f nw_endpoint_handler_path_change + 1509
4 libnetwork.dylib 0x0000000112bd18a2 nw_endpoint_handler_start + 570
5 libnetwork.dylib 0x0000000112be8026 nw_endpoint_resolver_start_next_child + 2050
6 libdispatch.dylib 0x00000001115b91e8 _dispatch_call_block_and_release + 12
7 libdispatch.dylib 0x00000001115e5dee _dispatch_client_callout + 8
8 libdispatch.dylib 0x00000001115c0a1d _dispatch_queue_serial_drain + 239
9 libdi
2016-06-19 08:30:09.357989 MyApp[13942:1214130] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] reported event flow:start_connect
2016-06-19 08:30:09.468327 MyApp[13942:1214130] [] nw_endpoint_flow_protocol_connected [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] Output protocol connected
2016-06-19 08:30:09.469541 MyApp[13942:1214130] [] nw_endpoint_flow_connected_path_change [4.1 31.13.79.246:443 ready socket-flow (satisfied)] Connected path is satisfied
2016-06-19 08:30:09.470103 MyApp[13942:1214130] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 ready socket-flow (satisfied)] reported event flow:finish_connect
2016-06-19 08:30:09.470858 MyApp[13942:1214130] [] nw_connection_endpoint_report [4 graph.facebook.com:443 ready resolver (satisfied)] reported event flow:finish_connect
2016-06-19 08:30:09.471427 MyApp[13942:1214130] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 ready socket-flow (satisfied)] reported event flow:changed_viability
2016-06-19 08:30:09.471870 MyApp[13942:1214130] [] nw_connection_endpoint_report [4 graph.facebook.com:443 ready resolver (satisfied)] reported event flow:changed_viability
2016-06-19 08:30:09.472479 MyApp[13942:1214112] [] nw_endpoint_start_tls_while_connected [4.1 31.13.79.246:443 ready socket-flow (satisfied)]
2016-06-19 08:30:09.473243 MyApp[13942:1214112] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] reported event flow:start_secondary_connect
2016-06-19 08:30:09.473685 MyApp[13942:1214112] [] nw_connection_endpoint_report [4 graph.facebook.com:443 in_progress resolver (satisfied)] reported event flow:start_secondary_connect
2016-06-19 08:30:09.474206 MyApp[13942:1214112] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] reported event flow:start_connect
2016-06-19 08:30:09.474740 MyApp[13942:1214112] [] nw_connection_endpoint_report [4 graph.facebook.com:443 in_progress resolver (satisfied)] reported event flow:start_connect
2016-06-19 08:30:09.475123 MyApp[13942:1214112] [] nw_endpoint_flow_protocol_connected [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] Transport protocol connected
2016-06-19 08:30:09.475502 MyApp[13942:1214112] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] reported event flow:finish_transport
2016-06-19 08:30:09.475834 MyApp[13942:1214112] [] nw_connection_endpoint_report [4 graph.facebook.com:443 in_progress resolver (satisfied)] reported event flow:finish_transport
2016-06-19 08:30:09.586843 MyApp[13942:1214130] [] nw_endpoint_flow_protocol_connected [4.1 31.13.79.246:443 in_progress socket-flow (satisfied)] Output protocol connected
2016-06-19 08:30:09.588117 MyApp[13942:1214130] [] nw_endpoint_flow_connected_path_change [4.1 31.13.79.246:443 ready socket-flow (satisfied)] Connected path is satisfied
2016-06-19 08:30:09.588724 MyApp[13942:1214130] [] nw_connection_endpoint_report [4.1 31.13.79.246:443 ready socket-flow (satisfied)] reported event flow:finish_connect
2016-06-19 08:30:09.589299 MyApp[13942:1214130] [] nw_connection_endpoint_report [4 graph.facebook.com:443 ready resolver (satisfied)] reported event flow:finish_connect
Here is my Code.
ViewController
import UIKit
import FBSDKCoreKit
import FBSDKLoginKit
import Firebase
class ViewController: UIViewController, FBSDKLoginButtonDelegate{
// Properties
@IBOutlet weak var usernameTextField: UITextField!
@IBOutlet weak var usernameLabel: UILabel!
@IBOutlet weak var submitButton: UIButton!
@IBOutlet weak var fbLoginBtn: FBSDKLoginButton!
var ref:FIRDatabaseReference!
private let dataurl = "https://project-URL/"
override func viewDidLoad() {
super.viewDidLoad()
self.ref = FIRDatabase.database().reference()
fbLoginBtn.delegate = self
fbLoginBtn.readPermissions = ["email"]
// Do any additional setup after loading the view, typically from a nib.
}
//Actions
@IBAction func onSubmitBtnPressed(_ sender: UIButton) {
usernameLabel.text = usernameTextField.text;
}
func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: NSError!) {
print("User Logged In")
if ((error) != nil)
{
// Process error
print("error")
}
else if result.isCancelled {
// Handle cancellations
print("cancelled")
}
else {
// If you ask for multiple permissions at once, you
// should check if specific permissions missing
if result.grantedPermissions.contains("email")
{
let credential = FIRFacebookAuthProvider.credential(withAccessToken: FBSDKAccessToken.current().tokenString)
// Do work
print("logged in ")
FIRAuth.auth()?.signIn(with: credential, completion: { (user, error) in
if (user != nil) {
let uid = user?.uid as String!
self.fetchProfile(uid!);
}
})
}
}
}
func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
print("User Logged Out")
}
func fetchProfile(_ uid: String) {
let parameters = ["fields": "email, first_name, last_name, picture.type(large)"]
var userinfo: [String:String] = [:]
FBSDKGraphRequest(graphPath: "me", parameters: parameters).start(completionHandler: { (connection, user, requestError) -> Void in
if requestError != nil {
print(requestError)
}
userinfo["email"] = user?["email"] as? String
userinfo["firstname"] = user?["first_name"] as? String
userinfo["lastname"] = user?["last_name"] as? String
self.ref.child("users").child(uid).setValue(userinfo)
})
}
}
AppDelegate
import UIKit
import Firebase
import FirebaseDatabase
import FBSDKCoreKit
import FBSDKLoginKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
// Use Firebase library to configure APIs
FIRApp.configure()
FIRDatabase.database().persistenceEnabled = true
return FBSDKApplicationDelegate.sharedInstance()
.application(application, didFinishLaunchingWithOptions: launchOptions)
}
func application(_ application: UIApplication, open url:URL,sourceApplication: String?, annotation: AnyObject) -> Bool {
return FBSDKApplicationDelegate.sharedInstance()
.application(application, open: url,
sourceApplication: sourceApplication, annotation: annotation)
}
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.
FBSDKAppEvents.activateApp()
}
}
Facebook docs need to be updated.
For iOS 9+, rather than using:
func application(_ application: UIApplication, open url:URL, sourceApplication: String?, annotation: AnyObject) -> Bool
You should be using:
func application(_ app: UIApplication, open url: URL, options: [String : AnyObject] = [:]) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application,
openURL: url,
sourceApplication: options[UIApplicationOpenURLOptionsSourceApplicationKey] as! String,
annotation: options [UIApplicationOpenURLOptionsAnnotationKey])
}
Seems like options[UIApplicationOpenURLOptionsAnnotationKey] doesn't work anymore. now you have to do it like this: options[UIApplicationOpenURLOptionsKey.sourceApplication]
This is what works for me
func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
return FBSDKApplicationDelegate.sharedInstance()
.application(app,
open: url,
sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
annotation: options[UIApplicationOpenURLOptionsKey.annotation])
}
Naresh S
The above function had to be changed a little bit . I had the same issue and It has worked for me. See the function below:
func application(_ app: UIApplication, open url: URL, options: [String : AnyObject] = [:]) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(app,open: url,sourceApplication: options[UIApplicationOpenURLOptionsSourceApplicationKey] as! String,annotation: options [UIApplicationOpenURLOptionsAnnotationKey])
}
来源：https://stackoverflow.com/questions/37903652/facebook-login-not-going-back-to-app-when-migrated-to-swift-3