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import UIKit
import AVFoundation
class ViewController: UIViewController {
// Set sizes used within the controller
let maxBoxWidth: CGFloat = 150
let boxOffset: CGFloat = 10
var scrollViewHeight: CGFloat = 0
var scrollViewWidth: CGFloat = 0
// Translation properties
let translator = Translator()
let colors = Colors()
let synthesizer = AVSpeechSynthesizer()
let languages = allLanguages
var inLanguage: Language!
var outLanguage: Language!
// Initiate picker views
let inPicker: UIPickerView = UIPickerView()
let outPicker: UIPickerView = UIPickerView()
// UI connections
@IBOutlet weak var translationsView: UIScrollView!
@IBOutlet weak var inLanguageField: UITextField!
@IBOutlet weak var outLanguageField: UITextField!
// Reverses to and from languages
@IBAction func switchLanguages(sender: UIButton) {
self.inLanguageField.text = self.outLanguage.name
self.outLanguageField.text = self.inLanguage.name
let tmpLanguage = self.inLanguage
self.inLanguage = self.outLanguage
self.outLanguage = tmpLanguage
self.translator.switchLanguages("from", to: "to") // to also switch concrete grammars
}
// Creates a new translation field when the user clicks the keyboard icon
@IBAction func openKeyboard(sender: UIButton) {
let field = createFromView()
field.becomeFirstResponder()
}
// Starts the speech recognition process when the user clicks the microphone icon
@IBAction func openMicrophone(sender: UIButton) {
self.createToView("microphone support is on its way")
}
// Sums the heights of all translation boxes + margins
func calculateTranslationHeights() -> CGFloat {
var height = CGFloat(-29.5) // compensate for invisible scrollbars
for view in self.translationsView.subviews {
height += view.frame.height + self.boxOffset
}
height += self.boxOffset
return height
}
// Creates a new "to translate" view and returns it for placement
func createFromView() -> UITextView {
let view = UITextView(frame: CGRect(
x: self.boxOffset,
y: self.calculateTranslationHeights(),
width: 20,
height: 30
))
view.backgroundColor = self.colors.backgroundColors["source"]
view.layer.cornerRadius = 5
view.returnKeyType = UIReturnKeyType.Done
view.delegate = self
self.translationsView.addSubview(view)
self.resizeTranslationsView()
return view
}
// A UIScrollView doesn't know its own height; use this method to resize it
func resizeTranslationsView() -> Void {
var subviewHeights = self.calculateTranslationHeights()
if (subviewHeights > self.scrollViewHeight) {
self.translationsView.contentSize = CGSizeMake(
self.translationsView.frame.width, subviewHeights)
// Also scroll to bottom
let offset = self.translationsView.contentSize.height - self.translationsView.bounds.size.height
let point = CGPointMake(0, offset)
self.translationsView.setContentOffset(point, animated: true)
}
}
// Creates and places a new "translated" view given the translated text
func createToView(translation: String) -> Void {
let view = UITextView(frame: CGRect(
x: 0, // we set the real value later a few lines down below
y: self.calculateTranslationHeights(),
width: self.maxBoxWidth,
height: 30
))
view.backgroundColor = self.colors.translationToUIColor(translation)
view.text = self.translator.formatTranslation(translation)
view.layer.cornerRadius = 5
view.sizeToFit()
// The view has been set, so we can now move it further to the right
view.frame.origin.x = self.scrollViewWidth - 10 - view.frame.width
self.translationsView.addSubview(view)
self.resizeTranslationsView()
}
// Perform translation
func translate(phrase: String) -> Void {
var translation = self.translator.translate(phrase)
self.createToView(translation)
// Run TTS except in simulator (because the simulator doesn't support it)
#if !arch(i386) && !arch(x86_64)
var utterance = AVSpeechUtterance(string: translation)
utterance.voice = AVSpeechSynthesisVoice(language: self.outLanguage.bcp)
self.synthesizer.speakUtterance(utterance)
#endif
}
override func viewDidLoad() {
super.viewDidLoad()
// Set size variables (-162 for the height to compensate for the views above the scrollview)
self.scrollViewHeight = UIScreen.mainScreen().bounds.height - 162
self.scrollViewWidth = UIScreen.mainScreen().bounds.width
// Load view pickers
self.inPicker.delegate = self
self.inPicker.dataSource = self
self.outPicker.delegate = self
self.outPicker.dataSource = self
self.inLanguageField.inputView = inPicker
self.outLanguageField.inputView = outPicker
// Load initial languages
self.inLanguage = self.languages[3] // English
self.outLanguage = self.languages[10] // Swedish
self.translator.loadGrammar("Eng", destination: "from")
self.translator.loadGrammar("Swe", destination: "to")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
// On selection functionality for the view pickers
extension ViewController: UIPickerViewDelegate {
// Makes the picker views return a language rather than text
func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String
{
return self.languages[row].name
}
// Row was selected: update buttons, load new grammar
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
var language = self.languages[row]
var fromTo: String
var textField = UITextField()
if (pickerView == self.inPicker) {
self.inLanguage = language
fromTo = "from"
textField = self.inLanguageField
} else {
self.outLanguage = language
fromTo = "to"
textField = self.outLanguageField
}
self.translator.loadGrammar(language.abbreviation, destination: fromTo)
textField.text = language.name
textField.resignFirstResponder()
}
}
// View picker layout functionality
extension ViewController: UIPickerViewDataSource {
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return self.languages.count
}
}
// Keyboard input functionality
extension ViewController: UITextViewDelegate {
// Method is called on keypress
func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
// UITextViews lack a method to close keyboard on enter, so we use this slight hack
if (text == "\n") {
textView.resignFirstResponder()
self.translate(textView.text)
return false
}
// But if it wasn't the enter key, we resize the UITextView dynamically
textView.sizeToFit()
if (textView.frame.size.width < self.maxBoxWidth) {
textView.frame.size.width += 10
}
return true
}
}
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