My Protocol is not Calling - ios

Question

I am using protocol for call method but my method does not call.Is there is any example which i use.
Here is my code:
ViewController
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
extension ViewController :ViewController1Delegate
{
func hello()
{
println("hbgyguyg");
}
}
In View Controller 1
import UIKit
#objc
protocol ViewController1Delegate
{
optional func hello()
}
class ViewController1: UIViewController {
var delegate: ViewController?
override func viewDidLoad() {
super.viewDidLoad()
delegate?.hello()
}
}
Please Help, I am new in Swift.Any help would be apperciated. Thanks in Advance

Answer 1

An example demo.
ViewController file
import UIKit
class ViewController: UIViewController, PopUpViewControllerDelegate
{
var popupVC: PopUpViewController!;
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.view!.backgroundColor = UIColor.whiteColor();
self.popupVC = PopUpViewController();
self.popupVC.delegate = self;
self.showPopUpVC();
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func popUpViewControllerDidPressOK(popUpVC: PopUpViewController) {
println("Yay?");
self.closePopUpVC();
}
func showPopUpVC()
{
let delayTime = dispatch_time(DISPATCH_TIME_NOW,
Int64(1.0 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
self .presentViewController(self.popupVC, animated: true, completion: nil);
}
}
func closePopUpVC()
{
let delayTime = dispatch_time(DISPATCH_TIME_NOW,
Int64(1.0 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
self.dismissViewControllerAnimated(true, completion: nil);
}
}
}
PopUpViewController file
import UIKit
protocol PopUpViewControllerDelegate
{
func popUpViewControllerDidPressOK(popUpVC: PopUpViewController);
}
class PopUpViewController: UIViewController {
var delegate: PopUpViewControllerDelegate!;
override func viewDidLoad() {
super.viewDidLoad()
self.view!.backgroundColor = UIColor.redColor();
// Do any additional setup after loading the view.
self.delegate!.popUpViewControllerDidPressOK(self);
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Notice how in my ViewController viewDidLoad() method, I have a line that initialises the popUp view controller and then set its delegate to be the ViewController itself:
self.popupVC = PopUpViewController();
self.popupVC.delegate = self; // you're missing this line I believe ?
I don't use Interface Builder or Storyboard but maybe select your VC1 in your Storyboard and look in the connections inspector to see if you drag a line from "delegate" to your ViewController file owner thing.
In the end, you should see a red screen popup after 1 second, followed by the word "Yay?" logged into your Xcode console and finally the popupVC dismisses.