my VC has no initializers - swift

Question

When I had XCode 6.1 everything worked well. After having XCOde 6.3 I am having problem with delegate methods.
Before:
protocol MainPageLoaderViewControllerDelegate{
func changeCategoryOfSingelTopicViewController(category: Int!)
}
class MainPageLoaderViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate, UIGestureRecognizerDelegate {
var delegate: MainPageLoaderViewControllerDelegate?
var categoryOfSingleTopic: Int! = 0 {
didSet{
delegate?.changeCategoryOfSingelTopicViewController(categoryOfSingleTopic!)
}
}
}
Now, Complier gives me error saying that MainPageLoaderViewController has no initializers. How should I declare delegate var?
The all code:
import UIKit
protocol MainPageLoaderViewControllerDelegate{
func changeCategoryOfSingelTopicViewController(category: Int!)
}
class MainPageLoaderViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate, UIGestureRecognizerDelegate {
var delegate: MainPageLoaderViewControllerDelegate?
var categoryOfSingleTopic: Int! = 0{
didSet{
// put to the right column on pageviewcontroller
movePageContentToViewControllerAtIndex(1)
println("here is single topic \(categoryOfSingleTopic)")
delegate?.changeCategoryOfSingelTopicViewController(categoryOfSingleTopic!)
changeADVControleItemsName(categoryOfSingleTopic)
}
}
let gestureRecognizerOfMainPageController: UIPanGestureRecognizer!
#IBOutlet var scrollContentView: UIView!
#IBOutlet var segmentControl: ADVSegmentedControl!
let transtionManger = TransitionManger()
var pageIndexTest: Int!
#IBOutlet var scrollView: UIScrollView!
var mainPageViewController : UIPageViewController!
var tableViewControllers = [UITableViewController]()
var newsLenta: UITableViewController!
var mainPage: SingleTopicTableViewController!
var onlinetranslation: UITableViewController!
var identifiers:NSArray = ["MainPageContentViewController", "MainPageTableViewController", "SingleTopicTableViewController"]
var pageContentViewController: UITableViewController!
override func viewDidLoad() {
super.viewDidLoad()
// self.scrollView.scrollEnabled = false
self.transtionManger.sourceViewController = self
CommonFunctions.setBackgroundImageToNavBar(self.navigationItem)
println("view did load of page controller loaded")
segmentControl.thumbColor = Design.setColorGrey20()
createArrayOfControllers()
resetToMainPage(1)
segmentControl.items = ["Лента", "Главная", "Онлайн"]
segmentControl.font = UIFont(name: "Avenir-Black", size: 12)
segmentControl.borderColor = UIColor(white: 1.0, alpha: 0.3)
segmentControl.selectedIndex = 1
segmentControl.selectedLabelColor = UIColor.whiteColor()
setGestureRecognizerToTableView()
self.transtionManger.segmentToSetInteraction = segmentControl
scrollContentView.addGestureRecognizer(transtionManger.exitPanGesture)
segmentControl.addTarget(self, action: "selectPageIndexBySegmentControl", forControlEvents: UIControlEvents.ValueChanged)
}
func changeADVControleItemsName(category:Int){
switch category{
case 0: segmentControl.items[1] = "Главная" // main
case 100: segmentControl.items[1] = "Избранные" // saved
case 1: segmentControl.items[1] = "Экономика" // economy
case 2: segmentControl.items[1] = "Политика" // politics
case 4: segmentControl.items[1] = "Общество" // community
case 5: segmentControl.items[1] = "Спорт" // sport
case 6: segmentControl.items[1] = "Культура" // culture
case 8: segmentControl.items[1] = "Проишествия" // events
case 10: segmentControl.items[1] = "Авто" // auto
case 11: segmentControl.items[1] = "Фото" // photo
case 12: segmentControl.items[1] = "Видео" // video
default: break
}
}
func changeCategoryOfSingelTopicViewController(category: Int!){
}
func setGestureRecognizerToTableView(){
self.transtionManger.tableViewFromSourceView = self.viewControllerAtIndex(segmentControl.selectedIndex) // we do it in order to disable table view until the menu is opened
}
func movePageContentToViewControllerAtIndex(index: Int){
switch index {
case 0:
println("zero index were selected")
pageContentViewController = self.viewControllerAtIndex(index)
mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward , animated: true, completion: nil)
setGestureRecognizerToTableView()
setExitPaGestureAtViewControllerWithIndex(segmentControl.selectedIndex)
// segmentControl.selectedIndex = index
case 1:
println("first element were selected")
pageContentViewController = self.viewControllerAtIndex(index)
mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
setGestureRecognizerToTableView()
setExitPaGestureAtViewControllerWithIndex(segmentControl.selectedIndex)
segmentControl.selectedIndex = index
case 2:
println("second element were selected")
pageContentViewController = self.viewControllerAtIndex(index)
mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
setGestureRecognizerToTableView()
setExitPaGestureAtViewControllerWithIndex(segmentControl.selectedIndex)
default: break
}
}
func selectPageIndexBySegmentControl(){
switch segmentControl.selectedIndex {
case 0:
movePageContentToViewControllerAtIndex(0)
case 1:
movePageContentToViewControllerAtIndex(1)
case 2:
movePageContentToViewControllerAtIndex(2)
default:
break
}
}
#IBAction func showOrCloseMenu(sender: AnyObject) {
if transtionManger.isMenuVisible == true {
println("it is true")
transtionManger.isMenuVisible = false
transtionManger.menuViewController.performSegueWithIdentifier("dismisMenu", sender: nil)
}
else{
println("it is false")
performSegueWithIdentifier("showMenu", sender: nil)
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let menu = segue.destinationViewController as! SideBarMenuTableViewController
if transtionManger.isMenuVisible == true {
transtionManger.presentingP = false
}
menu.transitioningDelegate = self.transtionManger
// add in order to set menuviewcontroller in transformerManager
self.transtionManger.menuViewController = menu
}
#IBAction func unwindSegueToMainScreen(segue:UIStoryboardSegue) {
// bug? exit segue doesn't dismiss so we do it manually...
self.dismissViewControllerAnimated(true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func createArrayOfControllers(){
newsLenta = self.storyboard?.instantiateViewControllerWithIdentifier("NewsLentaTableViewController")as! NewsLentaTableViewController
mainPage = self.storyboard?.instantiateViewControllerWithIdentifier("SingleTopicTableViewController") as! SingleTopicTableViewController
self.delegate = mainPage
onlinetranslation = self.storyboard?.instantiateViewControllerWithIdentifier("MainPageTableViewController") as! MainPageTableViewController
tableViewControllers = [newsLenta, mainPage, onlinetranslation]
}
func resetToMainPage(index: Int!) {
/* Getting the page View controller */
mainPageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("MainPageViewController") as! UIPageViewController
self.mainPageViewController.dataSource = self
self.mainPageViewController.delegate = self
pageContentViewController = self.viewControllerAtIndex(index)
// pageContentViewController.view.addGestureRecognizer(transtionManger.exitPanGesture3)
// self.transtionManger.sourceViewController = pageContentViewController // adding swipe to the pageContentViewControlle in order to close menu
//self.transtionManger.sourceViewController = mainPageViewController
self.mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
self.mainPageViewController.view.frame = CGRectMake(0, 102, self.view.frame.width, self.view.frame.height)
self.addChildViewController(mainPageViewController)
self.view.addSubview(mainPageViewController.view)
self.mainPageViewController.didMoveToParentViewController(self)
}
func viewControllerAtIndex(index : Int) -> UITableViewController? {
if index > 2 || index < 0 {
return nil
}
return tableViewControllers[index]
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
var index:Int!
if viewController.isKindOfClass(NewsLentaTableViewController) {
index = (viewController as! NewsLentaTableViewController).pageIndex
}else if viewController.isKindOfClass(MainPageTableViewController) {
index = (viewController as! MainPageTableViewController).pageIndex
}else if viewController.isKindOfClass(SingleTopicTableViewController) {
index = (viewController as! SingleTopicTableViewController).pageIndex
}else {return nil}
if index == 2 {
return nil
}
index = index + 1
return self.viewControllerAtIndex(index)
}
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
var index:Int!
if viewController.isKindOfClass(NewsLentaTableViewController) {
index = (viewController as! NewsLentaTableViewController).pageIndex
}else if viewController.isKindOfClass(MainPageTableViewController) {
index = (viewController as! MainPageTableViewController).pageIndex
}else if viewController.isKindOfClass(SingleTopicTableViewController) {
index = (viewController as! SingleTopicTableViewController).pageIndex
}else {return nil}
if index == 0 {
return nil
}
index = index - 1
return self.viewControllerAtIndex(index)
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int
{
return 2
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int
{
return thePageIndex
}
func pageViewController(pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [AnyObject], transitionCompleted completed: Bool) {
if completed && finished {
var index = previousViewControllers.startIndex
segmentControl.selectedIndex = thePageIndex
// add exit3 gesture recognizer to the current index
setExitPaGestureAtViewControllerWithIndex(segmentControl.selectedIndex)
setGestureRecognizerToTableView()
//selectedLabelFrame
//setContentOffSetOfUIScrollView()
}
}
override func viewDidAppear(animated: Bool) {
//setContentOffSetOfUIScrollView() // in the first load of view you need to set segment scroll
setExitPaGestureAtViewControllerWithIndex(segmentControl.selectedIndex)
}
func setExitPaGestureAtViewControllerWithIndex(index: Int!){
self.viewControllerAtIndex(index)?.tableView.addGestureRecognizer(transtionManger.exitPanGesture3)
}
func setContentOffSetOfUIScrollView(){
println(segmentControl.items.count - 1)
if thePageIndex == 0 {
scrollView.setContentOffset(CGPointMake(0, 0), animated: true)
return
}else if thePageIndex == segmentControl.items.count - 1{
if selectedLabelFrame.frame.origin.x + selectedLabelFrame.frame.width > self.view.frame.width {
var sum = selectedLabelFrame.frame.origin.x + selectedLabelFrame.frame.width
var scroll = sum - self.view.frame.width
scrollView.setContentOffset(CGPointMake(scroll, 0), animated: true)
return
}else {
var sum = selectedLabelFrame.frame.origin.x + selectedLabelFrame.frame.width
var scroll = self.view.frame.width - sum
scrollView.setContentOffset(CGPointMake(scroll, 0), animated: true)
return
}
}
if selectedLabelFrame.frame.origin.x + selectedLabelFrame.frame.width > self.view.frame.width / 2 {
println(selectedLabelFrame.frame.origin.x)
println(selectedLabelFrame.frame.width)
println(self.view.frame.width)
println("more")
if thePageIndex == 1 {
var averageWidth = selectedLabelFrame.frame.width/2
var sum = selectedLabelFrame.frame.origin.x + averageWidth
var scroll = sum - self.view.frame.width/2
println("scroll is \(scroll)")
scrollView.setContentOffset(CGPointMake(scroll, 0), animated: true)
}
}else{
println(selectedLabelFrame.frame.origin.x)
println(selectedLabelFrame.frame.width)
println(self.view.frame.width)
println("less")
if thePageIndex == 1 {
var averageWidth = selectedLabelFrame.frame.width/2
var sum = selectedLabelFrame.frame.origin.x + averageWidth
var scroll = self.view.frame.width/2 - sum
println("scroll is \(scroll)")
scrollView.setContentOffset(CGPointMake(scroll, 0), animated: true)
}
}
}
}

Answer 1

In Swift, all instance variables have to be initialized at init (see the documentation) . Before you added the delegate, your superview's initializer was being called (because you hadn't overridden it) and you hadn't added any new instance variables, so this was fine. Now, however, your superview's implementation is being called but it is not initializing your variable, which is a compiler error.
Two options:
1) just initialize in your declaration: var delegate: MainPageLoaderViewControllerDelegate? = nil
2) override init and initialize your variable there.

Answer 2

I solved the problem but still dont understand how it is related to the problem "VC has not initilizers"
I changed the code:
var gestureRecognizerOfMainPageController: UIPanGestureRecognizer!
to
var gestureRecognizerOfMainPageController: UIPanGestureRecognizer?

Answer 3

You need to have a setter method for your variable
var delegate: MainPageLoaderViewControllerDelegate? {
didSet {
// Do whatever changes you wish to do
}
}
or have an init which instantiates the variable with an initial value, or initialize the variable with a value where you declare it.