iOS: cannot request authorization from Spotify app - iphone

Question

I'm developping app using spotify-iOS-SDK, i have succesfully connect my app to Spotify from Safari, but when i try to connect my app from Spotify App, it doesn't request authorization in spotify app, instead it throw me back to my app after a checkmark icon show in Spotify and it caused crash to my app because the session is null.
This is my code:
var auth = SPTAuth.defaultInstance()!
auth.redirectURL = URL(string: ENV.SPOTIFY_REDIRECT_URL
auth.clientID = ENV.SPOTIFY_CLIENT_ID
auth.requestedScopes = [SPTAuthStreamingScope, SPTAuthPlaylistReadPrivateScope,
SPTAuthPlaylistModifyPublicScope, SPTAuthPlaylistModifyPrivateScope]
if SPTAuth.supportsApplicationAuthentication(){
UIApplication.shared.openURL(auth.spotifyAppAuthenticationURL())
}else{
if UIApplication.shared.openURL(auth.spotifyWebAuthenticationURL()){
if auth.canHandle(auth.redirectURL) {
// To do - build in error handling
}
}
}
I have put spotify-action in my LSApplicationQueriesSchemes. What am i doing wrong here? I saw DemoProject from https://github.com/spotify/ios-sdk
and it worked. It should request authorization right after my app go to Spotify App

Answer 1

You need some code in your AppDelegate that looks like follows:
func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
let auth = SPTAuth()
if auth.canHandle(auth.redirectURL) {
auth.handleAuthCallback(withTriggeredAuthURL: url, callback: { (error, session) in
// Do other things to save session...
return true
}
return false
}

Answer 2

i have resolved my issues, the problem is my Bundle ID in my app is different from my BundleID in my Spotify Dashboard.
https://developer.spotify.com/my-applications
Just match my bundle ID and it worked!