Facebook Integration

FacebokHandler.swift

import FacebookCore

graph-request.swift

import FacebookCore

let connection = GraphRequestConnection()
connection.add(GraphRequest(graphPath: "/me")) { httpResponse, result in
  switch result {
  case .success(let response):
    print("Graph Request Succeeded: \(response)")
  case .failed(let error):
    print("Graph Request Failed: \(error)")
  }
}

connection.start()

info.plist

<key>LSApplicationQueriesSchemes</key>
  <array>
      <string>fbapi</string>
      <string>fb-messenger-api</string>
      <string>fbauth2</string>
      <string>fbshareextension</string>
  </array>
  <key>CFBundleURLTypes</key>
  <array>
      <dict>
          <key>CFBundleURLSchemes</key>
          <array>
              <string>fb<#T##app key#></string>
          </array>
      </dict>
  </array>
  <key>FacebookAppID</key>
  <string><#T##app key#></string>
  <key>FacebookDisplayName</key>
  <string><#T##app name#></string>

logout.swift

import FBSDKLoginKit

FBSDKLoginManager().logOut()
FBSDKAccessToken.setCurrent(nil)
FBSDKProfile.setCurrent(nil)

protocol.md

Setting up Facebook in a Swift project

1. Add to pods:

pod 'FacebookCore'
pod 'FacebookLogin'
pod 'FacebookShare'

pod install

2. Modify info.plist

Copy the included snippet, then add fbauth2 to LSApplicationQueriesSchemes.

3. Add platform to Facebook app under Settings

iOS -> add bundle id, turn on single sign on.

4. Modify App Delegate

Import:

import FBSDKCoreKit

Add to didFinishLaunchingWithOptions:

// Set up Facebook
return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)

Add to applicationDidBecomeActive:

FBSDKAppEvents.activateApp()

Add:

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    let sourceApplication: String? = options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String
    return FBSDKApplicationDelegate.sharedInstance().application(app, open: url, sourceApplication: sourceApplication, annotation: nil)
}

5. Trigger login thusly:

let loginManager = LoginManager()
loginManager.logIn([ .PublicProfile ], viewController: self) { loginResult in
  switch loginResult {
  case .Failed(let error): 
    print(error)
  case .Cancelled:
    print("User cancelled login.")
  case .Success(let grantedPermissions, let declinedPermissions, let accessToken):
    print("Logged in!")
}

6. Thereafter get token thusly:

if let accessToken = AccessToken.current {
    // User is logged in, use 'accessToken' here.
    print("We are Facebook logged in")
}