pod 'FacebookSDK'

1<key>CFBundleURLTypes</key>
2<array>
3    <dict>
4        <key>CFBundleURLSchemes</key>
5        <array>
6            <string>fb{YOUR_FACEBOOK_APP_ID}</string>
7        </array>
8    </dict>
9</array>
10<key>LSApplicationQueriesSchemes</key>
11<array>
12    <string>fbapi</string>
13    <string>fbapi20130214</string>
14    <string>fbapi20130410</string>
15    <string>fbapi20130702</string>
16    <string>fbapi20131010</string>
17    <string>fbapi20131219</string>
18    <string>fbapi20140410</string>
19    <string>fbapi20140116</string>
20    <string>fbapi20150313</string>
21    <string>fbapi20150629</string>
22    <string>fbauth</string>
23    <string>fbauth2</string>
24    <string>fb-messenger-share-api</string>
25</array>
26<key>FacebookAppID</key>
27<string>{YOUR_FACEBOOK_APP_ID}</string>
28<key>FacebookDisplayName</key>
29<string>{YOUR_FACEBOOK_DISPLAY_NAME}</string>

1import FBSDKLoginKit
2
3class LoginViewController: UIViewController {
4    
5    fileprivate var loginManager: LoginManager!
6    
7    override func viewDidLoad() {
8        super.viewDidLoad()
9        loginManager = LoginManager()
10    }
11    
12    @IBAction func facebookLogin(_ sender: UIButton) {
13        loginManager.logIn(permissions: ["public_profile", "email"], from: self) { (result, error) in
14            guard let token = AccessToken.current else {
15                print("Failed to get access token")
16                return
17            }
18            let tokenString = token.tokenString
19
20            // Proceed to authenticate with your backend, using the token
21            self.authWithBackend(tokenString)
22        }
23    }
24    
25    private func authWithBackend(_ fbToken: String) {
26        // Implement your backend authentication logic here
27        print("Authenticating with backend using fbToken: \(fbToken)")
28    }
29}

1func callSecureWebService(withToken token: String) {
2    let url = URL(string: "https://api.yourservice.com/secured-endpoint")!
3    var request = URLRequest(url: url)
4    request.httpMethod = "GET"
5    request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
6
7    let task = URLSession.shared.dataTask(with: request) { data, response, error in
8        guard error == nil else {
9            print("Error from secured web service: \(String(describing: error))")
10            return
11        }
12
13        if let data = data, let responseJSON = try? JSONSerialization.jsonObject(with: data, options: []) {
14            print("Response from secured web service: \(responseJSON)")
15        }
16    }
17    task.resume()
18}