Use of unresolved identifer - IOS Swift3 - ios

Question

I am at my wits end here, I have been working on this for days and cannont seem to resolve this issue. I am relitivly new to the coding world, so I am sure this is a rookie mistake, but I just can't afford to waste any more time on this, its been a week almost.
I am writing in XCode 8.3, Swift 3. I am following tutorials to the letter from Auth0's website. Before I entered the code I am pasting below, my app would complie, but it would not work. Auth0 said I was mising this code.
I am receiving the following error: Use of unresolved identifier 'accessToken' I have no other errors or red !'s but this will not go away. I have tried moving the code around, that doesn't work. I have tried let, else, if statements, that doesn't work. I have spent mind numbing hours googling, and still I just can't seem to grasp what I am doing wrong.
Here is the code:
import UIKit
import Lock
import Auth0
import SimpleKeychain
class HomeViewController: UIViewController {
// MARK: - IBAction
#IBAction func showLoginController(_ sender: UIButton) {
Lock
.classic()
.withOptions {
$0.oidcConformant = true
$0.scope = "openid profile"
}
.onAuth { credentials in
let keychain = A0SimpleKeychain(service: "Auth0")
guard let accessToken = credentials.accessToken else { return }
keychain.setString(accessToken, forKey: "access_token")
self.showSuccessAlert(accessToken)
}
.present(from: self)
Auth0
.authentication()
.userInfo(withAccessToken: accessToken)
.start { result in
switch(result) {
case .sucess(let profile): break
case .failure(let error): break
}
}
Auth0
.webAuth()
.scope("openid profile")
.audience("https://mycompany.auth0.com/userinfo")
.start {
switch $0 {
case .failure(let error):
// Handle the error
print("Error: \(error)")
case .success(let credentials):
// Do something with credentials e.g.: save them.
// Auth0 will automatically dismiss the hosted login page
print("Credentials: \(credentials)")
}
}
Auth0
.webAuth()
.scope("openid profile offline_access")
.start {
switch $0 {
case .failure(let error):
// Handle the error
print("Error: \(error)")
case .success(let credentials):
guard let accessToken = credentials.accessToken, let refreshToken = credentials.refreshToken else { return }
let keychain = A0SimpleKeychain(service: "Auth0")
keychain.setString(accessToken, forKey: "access_token")
keychain.setString(refreshToken, forKey: "refresh_token")
}
}
}
// MARK: - Private
fileprivate func showSuccessAlert(_ accessToken: String) {
let alert = UIAlertController(title: "Success", message: "accessToken: \(accessToken)", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}

Answer 1

Strategies for Debugging Swift Code:
Thoroughly investigate LLDB debugger to see what happened
Read through existing code (all .swift files that you wrote code in) to check for any spelling errors, etc.
Open a new Xcode project and run each .swift file to pinpoint where the error is and/or use breakpoints in your existing Xcode project
Enable zombies
Code pesticides :P
Good luck with the rest of your project!