Custom protocol is not working in swift - ios

Question

I have two UIViewControllers HomeViewController and ArrangeViewController.
In ArrangeViewController, I have this code
import UIKit
protocol ArrangeClassProtocol
{
func recieveThearray(language : NSMutableArray)
}
class ArrangeViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { // class "ArrangeViewController" has no initializer
var ArrangeClassDelegateObject : ArrangeClassProtocol?
// Global Variables Goes Here
var languageNamesArray: NSMutableArray = ["Tamil","English"]
var userDefaults : NSUserDefaults = NSUserDefaults.standardUserDefaults()
var tempArray : NSMutableArray = NSMutableArray()
// Outlets Goes Here
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Saving the Array in a UserDefaultObject
if userDefaults.boolForKey("languageNamesArrayuserDefaults")
{
tempArray = userDefaults.objectForKey("languageNamesArrayuserDefaults") as NSMutableArray
}
else
{
tempArray = languageNamesArray
}
self.tableView.separatorInset = UIEdgeInsetsZero
// TableView Reordering
self.tableView.setEditing(true, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prefersStatusBarHidden() -> Bool
{
return true
}
// Delegate Methods of the UITableView
func numberOfSectionsInTableView(tableView: UITableView!) -> Int {
return 1
}
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
return tempArray.count
}
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
let cell = tableView.dequeueReusableCellWithIdentifier("Arrange", forIndexPath: indexPath) as ArrangeTableViewCell
cell.languageName.font = UIFont(name: "Proxima Nova", size: 18)
cell.languageName.text = tempArray.objectAtIndex(indexPath.row) as NSString
cell.showsReorderControl = true
return cell
}
// Delegate Methods for dragging the cell
func tableView(tableView: UITableView!, editingStyleForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCellEditingStyle
{
return UITableViewCellEditingStyle.None
}
func tableView(tableView: UITableView!, canMoveRowAtIndexPath indexPath: NSIndexPath!) -> Bool
{
return true
}
func tableView(tableView: UITableView!, moveRowAtIndexPath sourceIndexPath: NSIndexPath!, toIndexPath destinationIndexPath: NSIndexPath!)
{
var stringToMove = tempArray.objectAtIndex(sourceIndexPath.row) as NSString
tempArray .removeObjectAtIndex(sourceIndexPath.row)
tempArray .insertObject(stringToMove, atIndex: destinationIndexPath.row)
}
func tableView(tableView: UITableView!, targetIndexPathForMoveFromRowAtIndexPath sourceIndexPath: NSIndexPath!, toProposedIndexPath proposedDestinationIndexPath: NSIndexPath!) -> NSIndexPath!
{
let section:AnyObject = tempArray .objectAtIndex(sourceIndexPath.section)
var sectionCount = tempArray.count as NSInteger
if sourceIndexPath.section != proposedDestinationIndexPath.section
{
var rowinSourceSection:NSInteger = (sourceIndexPath.section > proposedDestinationIndexPath.section) ? 0 : (sectionCount-1)
return NSIndexPath(forRow: rowinSourceSection, inSection: sourceIndexPath.row)
}
else if proposedDestinationIndexPath.row >= sectionCount
{
return NSIndexPath(forRow: (sectionCount-1), inSection: sourceIndexPath.row)
}
return proposedDestinationIndexPath
}
// Creating the HomeViewController Object and presenting the ViewController
#IBAction func closeButtonClicked(sender: UIButton)
{
userDefaults.setObject(tempArray, forKey: "languageNamesArrayuserDefaults")
userDefaults.synchronize()
ArrangeClassDelegateObject?.recieveThearray(languageNamesArray)
self.dismissViewControllerAnimated(true, completion: nil)
}
}
In the HomeViewController, I this code.
class HomeViewController: UIViewController, ArrangeClassProtocol {
var ArrangeClassObject : ArrangeViewController = ArrangeViewController() // ArrangeViewController is Constructible with ()
override func viewDidLoad() {
super.viewDidLoad()
self.ArrangeClassObject.ArrangeClassDelegateObject = self
}
func recieveThearray(language: NSMutableArray)
{
println(language)
}
}
I wanted to access the Array that am passing from the ArrangeViewController. But its showing errors that I commented out near to the statements. I also used the optional values with the HomeViewController, It also showing error and crashes the app. Please somebody help to figure this out.
I got this idea by a github post. In that project he used one UIViewController and one another swift class. That is also possible for me. But i want to work it out with these two UIViewControllers.

Answer 1

Thanks for the new code. The problem that's creating your error message is here:
#IBOutlet weak var tableView: UITableView!
If you change this code to:
#IBOutlet weak var tableView: UITableView?
Then the compiler will stop complaining about the lack of an initialiser.
However, that's more a diagnostic tool than an actual fix for the problem, which is that you need an initialiser. I think what's going on is that up until you add an uninitialised property at your own class's level in the hierarchy, you're being provided with a default initialiser. At the point you add your uninitialised property, Swift will stop generating the default initialiser, and expect you to provide your own.
If you check the header for UIViewController, you'll find this advice:
/*
The designated initializer. If you subclass UIViewController, you must call the super implementation of this
method, even if you aren't using a NIB. (As a convenience, the default init method will do this for you,
and specify nil for both of this methods arguments.) In the specified NIB, the File's Owner proxy should
have its class set to your view controller subclass, with the view outlet connected to the main view. If you
invoke this method with a nil nib name, then this class' -loadView method will attempt to load a NIB whose
name is the same as your view controller's class. If no such NIB in fact exists then you must either call
-setView: before -view is invoked, or override the -loadView method to set up your views programatically.
*/
init(nibName nibNameOrNil: String!, bundle nibBundleOrNil: NSBundle!)
So, perhaps just try:
init() {
super.init(nibName: nil, bundle: nil)
}
...which should restore the functionality of the originally-provided initialiser. I'm guessing your IBOutlet will be properly "warmed up" from the Storyboard by the base class's initialiser, and you should again be able to construct the View Controller with an argumentless initialiser.