facebook login in swift

facebookLogin.swift

// facebook login in swift 3.0


// the following code into info.plist

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>fb1801381186770425</string>
        </array>
    </dict>
</array>
<key>FacebookAppID</key>
<string>AddYourID</string>
<key>FacebookDisplayName</key>
<string>YourAppName</string>
<key>LSApplicationQueriesSchemes</key>
<array>
    <string>fbapi</string>
    <string>fb-messenger-api</string>
    <string>fbauth2</string>
    <string>fbshareextension</string>
    <string>instagram</string>
</array>
<key>NSLocationWhenInUseUsageDescription</key>
<string>To access your current location</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>To share </string>

// add the following code in appdelegate.swift

import FBSDKCoreKit
import FBSDKLoginKit
import FBSDKCoreKit

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
        return true
        
    }

func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
            return FBSDKApplicationDelegate.sharedInstance().application(application, open: url, sourceApplication: sourceApplication, annotation: annotation)
  
    }

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
            return FBSDKApplicationDelegate.sharedInstance().application(app, open: url, options: options)
        return false
    }

// add  the function where you want
import FBSDKLoginKit

 func FbLoginButton() {
        
        cheak = "facebook"
        UserDefaults.standard.set(cheak, forKey: "cheak")
        print("fb login workin")
        if (FBSDKAccessToken.current() != nil)
        {
            // User is logged in, do work such as go to next view controller.
            print("already login")
            self.getFBUserData()
            
        }else{
            
            let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
            
            fbLoginManager.logIn(withReadPermissions: ["email"], from: self) { (result, error) in
                if (error == nil){
                    let fbloginresult : FBSDKLoginManagerLoginResult = result!
                    if fbloginresult.grantedPermissions != nil {
                        if(fbloginresult.grantedPermissions.contains("email"))
                        {
                            print("fb result data::\(result)")
                            self.getFBUserData()
                            //fbLoginManager.logOut()
                        }
                    }
                }else{
                self.InvalidAlert()
                }
            }
        }
        
    }
    
    func getFBUserData()
    {
        print("getFBUserData already login")
        
        if((FBSDKAccessToken.current()) != nil)
        {
            
            print("getFBUserData ")
            
            FBSDKGraphRequest(graphPath: "/me", parameters: ["fields": "id, name, picture.type(large), email"]).start(completionHandler: { (connection, result, error) -> Void in
                if (error == nil)
                {
                    print("\(result)")
                    
                    
                    
                    var name = ""
                    var email = ""
                    var id = ""
                    
                    if let dic =  result as? NSDictionary{
                        
                        if let email1 = dic.value(forKey: "email") as? String{
                            print("email is ::\(email)")
                            email = email1
                            
                        }
                        if let name1 = dic.value(forKey: "name") as? String{
                            print("name is::\(name)")
                            name = name1
                            
                        }
                        if let id1 = dic.value(forKey: "id") as? String{
                            print("id  is::\(id)")
                            id = id1
                            
                            
                        }
                        if let picture = dic.value(forKey: "picture") as? NSDictionary{
                            
                            if let data = picture.value(forKey: "data") as? NSDictionary{
                                
                                if let url = data.value(forKey: "url") as? String{
                                    print("url is \(url)")
                                    self.sendFbData(id: id, name: name, email: email, user_image: url)
                                    
                                }
                                
                            }
                            
                        }
                    }
                    
                }
            })
            
        }else{
            print("fb already login")
            
        }
        
        
    }