iOS: Facebook login

1) Create fb application and install sdk steps

pod 'FBSDKCoreKit'
pod 'FBSDKShareKit'
pod 'FBSDKLoginKit'

2) In your app delegate:

Objective C

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(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

        

        let handled = FBSDKApplicationDelegate.sharedInstance().application(app, open: url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String, annotation: options[UIApplicationOpenURLOptionsKey.annotation])

        

        return handled

    }

Swift

import FBSDKCoreKit

...

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
       
        FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
       
        return true
    }

...

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

3) Add login button

Add default facebook button

Swift


let loginButton = FBSDKLoginButton()
loginButton.readPermissions = ["public_profile", "email"]
loginButton.delegate = self
loginButton.center = view.center

...


extension ViewController: FBSDKLoginButtonDelegate {
    
    func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
        if let token = result?.token?.tokenString {
            NSLog("Token: %@", token)
        } else {
            NSLog("Error: %@", error.localizedDescription)
        }
    }
    
    func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
        NSLog("Logged out from facebook")
    }
}

Add custom button

Swift 

FBSDKLoginManager().logIn(withReadPermissions: ["email","public_profile"], from: self) { (result, error) in

            if let let tokenString = result?.token?.tokenString {

            } else {
                // error
            }
        }

4) In you .plist add

<key>CFBundleURLTypes</key>
    <array>
        <dict>
            <key>CFBundleURLSchemes</key>
            <array>
                <string>fb{facebook_app_id}</string>
            </array>
        </dict>
    </array>
    <key>FacebookAppID</key>
    <string>{facebook_app_id}</string>
    <key>FacebookDisplayName</key>
    <string>ROMWOD</string>
    <key>LSApplicationQueriesSchemes</key>
    <array>
        <string>fbapi</string>
        <string>fb-messenger-api</string>
        <string>fbauth2</string>
        <string>fbshareextension</string>
    </array>

iOS: TextView with placeholder text

class TextViewWithPlaceholder: UITextView {

    

    private var _placeholderTextColor: UIColor = UIColor.lightGray

    @IBInspectable var placeholderTextColor: UIColor {

        set {

            _placeholderTextColor = newValue

            textColor = newValue

        }

        get {

            return _placeholderTextColor

        }

    }

    @IBInspectable var placeholderText: String? {

        didSet {

            if text.isEmpty {

                text = placeholderText

            }

        }

    }

    

    private var initialTextColor: UIColor?

    

    override init(frame: CGRect, textContainer: NSTextContainer?) {

        super.init(frame: frame, textContainer: textContainer)

        

        commonInit()

    }

    

    required init?(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder)

        

        commonInit()

    }

    

    private func commonInit() {

        

        initialTextColor = textColor

        

        text = placeholderText

        

        NotificationCenter.default.addObserver(self, selector: #selector(didBeginEditing(_:)), name: UITextView.textDidBeginEditingNotification, object: self)

        NotificationCenter.default.addObserver(self, selector: #selector(didEndEditing(_:)), name: UITextView.textDidEndEditingNotification, object: self)

    }

    

    deinit {

        NotificationCenter.default.removeObserver(self)

    }

    

    @objc func didBeginEditing(_ notification: NSNotification) {

        

        if let textView = notification.object as? TextViewWithPlaceholder, textView == self, text == placeholderText {

            

            text = ""

            textColor = initialTextColor

        }

    }

    

    @objc func didEndEditing(_ notification: NSNotification) {

        

        if let textView = notification.object as? TextViewWithPlaceholder, textView == self, text.isEmpty {

            

            text = placeholderText

            textColor = placeholderTextColor

        }

    }

}