how to use protocol in uiviewcontroller ,swift - ios

Question

How to use protocol? I can't use it. I just wanna print out "abc" when I click the start button. It didn't work. plz help me
import UIKit
import SpriteKit
protocol GameDelegate {
func gameOver()
}
class MainMenuScene: SKScene
{
var Gdelegate: GameDelegate?
override func didMoveToView(view: SKView)
{
let background = SKSpriteNode(imageNamed: "DiscsBackground")
background.size = self.size
background.zPosition = 0
background.position = CGPoint(x: self.size.width/2, y: self.size.height/2)
self.addChild(background)
let gameTitleLabel1 = SKLabelNode(fontNamed: "Pusab")
gameTitleLabel1.text = "Disappearing"
gameTitleLabel1.fontSize = 90
gameTitleLabel1.fontColor = SKColor.whiteColor()
gameTitleLabel1.position = CGPoint(x: self.size.width/2, y: self.size.height*0.75)
gameTitleLabel1.zPosition = 1
self.addChild(gameTitleLabel1)
let gameTitleLabel2 = SKLabelNode(fontNamed: "Pusab")
gameTitleLabel2.text = "Discs"
gameTitleLabel2.fontSize = 250
gameTitleLabel2.fontColor = SKColor.whiteColor()
gameTitleLabel2.position = CGPoint(x: self.size.width/2, y: self.size.height*0.6)
gameTitleLabel2.zPosition = 1
self.addChild(gameTitleLabel2)
let gameByLabel = SKLabelNode(fontNamed: "Pusab")
gameByLabel.text = "Disappearing"
gameByLabel.fontSize = 90
gameByLabel.fontColor = SKColor.whiteColor()
gameTitleLabel2.position = CGPoint(x: self.size.width/2, y: self.size.height*0.95)
gameByLabel.zPosition = 1
self.addChild(gameByLabel)
let startLabel = SKLabelNode(fontNamed: "Pusab")
startLabel.text = "start"
startLabel.fontSize = 150
startLabel.fontColor = SKColor.whiteColor()
startLabel.position = CGPoint(x: self.size.width/2, y: self.size.height*0.35)
startLabel.zPosition = 1
startLabel.name = "startButton"
self.addChild(startLabel)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
for touch: AnyObject in touches
{
let pointOfTouch = touch.locationInNode(self)
let tappedNode = nodeAtPoint(pointOfTouch)
let tappedNodeName = tappedNode.name
if tappedNodeName == "startButton"
{
//self.scene?.view?.presentScene(nil)
Gdelegate?.gameOver()
}
}
}
}
class MHAGameViewController: UIViewController,GameDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let scene = MainMenuScene(size: CGSize(width: 1536, height: 2048))
// Configure the view.
let skView = self.view as! SKView
skView.showsFPS = true
skView.showsNodeCount = true
/* Sprite Kit applies additional optimizations to improve rendering performance */
skView.ignoresSiblingOrder = true
/* Set the scale mode to scale to fit the window */
scene.scaleMode = .AspectFill
skView.presentScene(scene)
}
func gameOver() {/*
self.performSegueWithIdentifier("segue1", sender: self)
let alertController = UIAlertController(title: "HELP", message:
"Please wait....", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addAction(UIAlertAction(title: "close", style: UIAlertActionStyle.Default,handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)*/
print("abc")
}
override func shouldAutorotate() -> Bool {
return true
}
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
return .AllButUpsideDown
} else {
return .All
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Release any cached data, images, etc that aren't in use.
}
override func prefersStatusBarHidden() -> Bool {
return true
}
}

Answer 1

You should set the delegate as follow :
let scene = MainMenuScene(size: CGSize(width: 1536, height: 2048))
scene.Gdelegate = self

Answer 2

Step: 1 - Declare protocol Just before class Declaration and Below Import stmt. (Inside Cell Class)
protocol BtnsAction: NSObjectProtocol
{
func btnLearnAction(_ sender: Any?)
}
weak var delegate: BtnsAction?
Step: 2 - Declare Button Action Method inside Cell Class.
#IBAction func btnLearnMoreAction(_ sender: UIButton) {
self.delegate?.btnLearnAction(self)
}
Step: 3 - Now, Inside ViewController.
class MyViewController_VC:ViewController, BtnsAction
//MARK: - Protocol Method -
func btnLearnAction(_ sender: Any?) {
let cell = sender as! SubCategoryCell
let indexpath = self.TableView1.indexPath(for: cell)
let dictData = self.arrFree_Listing[(indexpath?.row)!] as! NSMutableDictionary
let strId = String(dictData.value(forKey: "id") as! Int)
let detailVC = self.storyboard?.instantiateViewController(withIdentifier: "ListingDetails_InnerVC") as! ListingDetails_InnerVC
detailVC.strID = strId
self.navigationController?.pushViewController(detailVC, animated: true)
}
**Don't Forget to add **
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "_Cell") as! _Cell
cell.delegate = self
return cell
}