S3 Credentials

AppDelegate.swift

func initializeS3() {
        let poolId = "***** your poolId *****"
        let credentialsProvider = AWSCognitoCredentialsProvider(
            regionType: .APSouth1, //other regionType according to your location.
            identityPoolId: poolId
        )
        let configuration = AWSServiceConfiguration(region: .APSouth1, credentialsProvider: credentialsProvider)
        AWSServiceManager.default().defaultServiceConfiguration = configuration
    }