facebook - AWS Cognito , logins method of AWSIdentityProviderManager protocol is not getting called for iOS -


we trying use aws cognito facebook login, when integrating code per aws documentation below

class facebookprovider: nsobject, awsidentityprovidermanager {      func logins() -> awstask<nsdictionary> {                 if let token = accesstoken.current?.authenticationtoken {                     return awstask(result: [awsidentityproviderfacebook:token])                 }                 return awstask(error:nserror(domain: "facebook login", code: -1 , userinfo: ["facebook" : "no current facebook access token"]))             }         }

this code have written in appdelegate.swift in didfinishlaunchingwithoptions method 

fbsdkapplicationdelegate.sharedinstance().application(application, didfinishlaunchingwithoptions: launchoptions)       let obj = facebookprovider()      let credentialsprovider = awscognitocredentialsprovider(regiontype:.useast1, identitypoolid:"somepoolid",identityprovidermanager: obj)      let configuration = awsserviceconfiguration(region:.useast1, credentialsprovider:credentialsprovider)  awsservicemanager.default().defaultserviceconfiguration = configuration

here see logins method not getting called.

since logins method not getting called not able pass facebook authentication token amazon cognito.

any highly appreciated.


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