File additions to implement Facebook SDK with Swift 2

AppDelegate.swift

import FBSDKShareKit

...

func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
  return FBSDKApplicationDelegate.sharedInstance().application(
    application,
    openURL: url,
    sourceApplication: sourceApplication,
    annotation: annotation)
}

info.plist

<key>CFBundleURLTypes</key>
<array>
  <dict>
  <key>CFBundleURLSchemes</key>
  <array>
    <string>fb859573284156564</string>
  </array>
  </dict>
</array>
<key>FacebookAppID</key>
<string>859573284156564</string>
<key>FacebookDisplayName</key>
<string>login example</string>
<key>NSAppTransportSecurity</key>
<dict>
    <key>NSExceptionDomains</key>
    <dict>
      <key>facebook.com</key>
      <dict>
        <key>NSIncludesSubdomains</key>
        <true/>
        <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
        <false/>
      </dict>
      <key>fbcdn.net</key>
      <dict>
        <key>NSIncludesSubdomains</key>
        <true/>
        <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
        <false/>
      </dict>
      <key>akamaihd.net</key>
      <dict>
        <key>NSIncludesSubdomains</key>
        <true/>
        <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
        <false/>
      </dict>
    </dict>
</dict>
<key>LSApplicationQueriesSchemes</key>
<array>
  <string>fbapi</string>
  <string>fb-messenger-api</string>
  <string>fbauth2</string>
  <string>fbshareextension</string>
</array>

ViewController.swift

import FBSDKLoginKit

...

override func viewDidLoad() {
  super.viewDidLoad()
  
  let loginButton = FBSDKLoginButton.init()
  loginButton.center = self.view.center
  self.view.addSubview(loginButton)
}