UIPickerView - One selection among multiple options

1. Drag a UIPickerView to the storyboard

2. Control-Drag the UIPickerView to the ViewController for datasource and delegate

3. Complete the code as below:

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    let languageList = ["United States", "United Kingdom", "Australia", "China", "Hong Kong", "Taiwan"]

    let languageCodeList = ["en-us", "en-gb", "en-au", "zh-cn", "zh-hk", "zh-tw"]

    

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {

        return 1

    }

    

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        return languageList.count

    }

    

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {

        return languageList[row]

    }

    

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

        println("language code is \(languageCodeList[row])")

    }

Show/Hide the keyboard while using the UITextView/UITextField

To show the keyboard:

self.inputTextView.becomeFirstResponder()

To hide the keyboard:

self.inputTextView.resignFirstResponder()

To hide the keyboard while tapping outside the UITextField/UITextField:

@IBOutlet weak var inputTextView: UITextView!

    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {

        self.inputTextView.resignFirstResponder()

    }

To hide the keyboard while tapping the return key in the UITextField:

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var inputTextField: UITextField!

    

    func textFieldShouldReturn(textField: UITextField) -> Bool {

        textField.resignFirstResponder()

        return true

    }

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        self.inputTextField.delegate = self

Link:
Create a text field programmatically

UIScrollView - Zoom in/zoom out and scroll/move an image with ScrollView

1. Drag a UIScrollView to the storyboard.

2. Control-drag the UIScrollView to

    @IBOutlet weak var myUIScrollView: UIScrollView!


3. Complete the code as below:

import UIKit

class ViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var myUIScrollView: UIScrollView!

    

    var myUIImageView: UIImageView!

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        self.myUIScrollView.maximumZoomScale = 5.0

        self.myUIScrollView.minimumZoomScale = 0.5

        self.myUIScrollView.delegate = self

        

        myUIImageView = UIImageView(image: UIImage(named: "big_image.png"))

        self.myUIScrollView.addSubview(myUIImageView)

    }

    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {

        return myUIImageView

    }

AVSpeechSynthesizer - Text-to-Speech (TTS) function

import UIKit

import AVFoundation

class ViewController: UIViewController {

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        let mySynthesizer = AVSpeechSynthesizer()

        let myUtterence = AVSpeechUtterance(string: "Hello World. Testing 1 2 3.")

        myUtterence.rate = AVSpeechUtteranceMinimumSpeechRate

        myUtterence.voice = AVSpeechSynthesisVoice(language: "en-au")

        myUtterence.pitchMultiplier = 0.5 //between 0.5 and 2.0. Default is 1.0.

        mySynthesizer.speakUtterance(myUtterence)

    }

Note:
Language List

SLComposeViewController - Post a message and an image to Facebook

Update:
December 19, 2015 - The solution below no longer works. It seems that Facebook SDK is required.
January 15, 2016 - See this: Facebook SDK and Swift - Post a message and an image to Facebook

1. Create a UIButton and a UIImageView

2. Include an image file swift.png (or a photo) in the project

3. Write the code as below:

import UIKit

import Social

class ViewController: UIViewController {

    @IBOutlet weak var myImage: UIImageView!

    

    var myUIImage : UIImage!

    

    @IBAction func facebookButtonPressed(sender: UIButton) {

        if SLComposeViewController.isAvailableForServiceType(SLServiceTypeFacebook) {

            var myFBController = SLComposeViewController(forServiceType: SLServiceTypeFacebook)

            myFBController.setInitialText("Test http://studyswift.blogspot.com")

            myFBController.addImage(self.myUIImage)

            self.presentViewController(myFBController, animated: true, completion: nil)

        } else {

            let alertView = UIAlertView()

            alertView.message = "Please login to Facebook."

            alertView.addButtonWithTitle("OK")

            

            alertView.show()

        }

    }

    override func viewDidLoad() {

        super.viewDidLoad()

        

        myUIImage = UIImage(named: "swift.png")

        

        self.myImage.image = myUIImage

    }

References:
Facebook policy about prefill violation
SLServiceTypeTwitter - Tweet from an iOS App

Facebook SDK and Swift - Create a Facebook Login Button
Facebook SDK and Swift - Post a message and an image to Facebook
Facebook SDK and Swift - Post a message using Graph API and post an image using FBSDKShareKit