[MEDIUM] Strava API - Access & Refresh token - iOS 13, Swift 5 - Step 5

ViewController.swift

private func presentStravaAuthentication() {
    let url: String = "https://www.strava.com/oauth/mobile/authorize?client_id=\(clientId)&redirect_uri=\(urlScheme)%3A%2F%2F\(fallbackUrl)&response_type=code&approval_prompt=auto&scope=read"
    guard let authenticationUrl = URL(string: url) else { return }
    
    authSession = ASWebAuthenticationSession(url: authenticationUrl, callbackURLScheme: "\(urlScheme)://") { [weak self] url, error in
        if let error = error {
            print(error)
        } else {
            if let code = self?.getCode(from: url) {
                print(code)
            }
        }
    }

    authSession?.presentationContextProvider = self
    authSession?.start()
}