Presenting a Uiviewcontroller from Skscene Shows Black Screen

Presenting a UIViewController from SKScene shows black screen

To present a SKScene from another SKScene you should do for example :

let nextScene = MainScene(size: self.scene!.size)
self.scene?.view?.presentScene(nextScene, transition: SKTransition.doorway(withDuration: 1))

You don't need to retrieve your currentViewController because you have always access to the view of your scene

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As explained to the comments below, there are various methods to call a function implemented to your game viewController, one could be to create a delegate/protocol as showed in this code:

GameScene example:

import SpriteKit
protocol GameViewControllerDelegate: class {
    func callMethod(inputProperty:String)
}
class GameScene: SKScene {
    weak var gameViewControllerDelegate:GameViewControllerDelegate?
    override func didMove(to view: SKView) {
        gameViewControllerDelegate?.callMethod(inputProperty: "call game view controller method")
    }
}

GameViewController example:

class GameViewController: UIViewController, GameViewControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        if let view = self.view as! SKView? {
            // Load the SKScene from 'GameScene.sks'
            if let scene = SKScene(fileNamed: "GameScene") {
                let gameScene = scene as! GameScene
                gameScene.gameViewControllerDelegate = self
                gameScene.scaleMode = .aspectFill
                view.presentScene(gameScene)
            }
            view.ignoresSiblingOrder = true
            view.showsFPS = true
            view.showsNodeCount = true
        }
    }
    func callMethod(inputProperty:String) {
        print("inputProperty is: ",inputProperty)
    }
}

Output:

New SKScene Set as Default in SpriteKit Game Turns Out Blank

If you have a corresponding SKS file created in the Scene editor then you load your scene like so...

// Load the SKScene from WelcomeScene.sks'
if let welcomeScene = WelcomeScene(fileNamed: "WelcomeScene")  {
    welcomeScene.scaleMode = .aspectFill
    view.presentScene(welcomeScene)
}

if you do not have a corresponding SKS file created in the scene editor but would rather load the scene that was created in code use...

welcomeScene= WelcomeScene(size: skView.bounds.size)
welcomeScene.scaleMode = .aspectFill
skView.presentScene(welcomeScene)

Xcode 11.5 IOS 13.5 Dark screen after setting view controller in Scenedelgate

This line is wrong:

self.view?.window?.rootViewController = UINavigationController(rootViewController: HomeViewController())

The problem, in particular, is this phrase in your code:

HomeViewController()

That creates a new blank HomeViewController, not the instance you designed in the storyboard. To get that instance, tell the storyboard to instantiate it for you.

Presenting a UIViewController from an SKscene (SpriteKit)

You cannot move directly from an SKScene to another UIViewController.

However, the SKScene is already contained in a UIViewController.

You can use delegation to pass a method call from the scene to its controller. The controller can then move to another view controller.

So...

1. Create a delegate protocol that contains a method something like... - (void)transitionToOtherViewController;

2. Set the current view controller as the delegate of your scene.

   self.scene.delegate = self;

3. When you want to move to another view controller. In the scene you would have something like...

   [self.delegate transitionToOtherViewController];

Then in the view controller you have...

- (void)transitionToOtherViewController
{
    MyOtherViewController *controller = [MyOtherViewController new];

    [self.navigationController pushViewController:controller animated:YES];
}

Or something like this...

Losing reference to GameViewController from inside SpriteKit when moving between scenes - want to move between SKScene and UITableView

There are two simple methods to call a GameViewController function from other classes: through a delegate or by making the class instance static.

// DELEGATE
//
// GameViewController.swift

protocol GameView_Delegate
{
    func show_ui()
}

class GameViewController: UIViewController, GameView_Delegate
{
    override func viewDidLoad()
    {

        //   ... 

        if let view = self.view as! SKView?
        {
            if let scene = SKScene(fileNamed: "MenuScene")
            {        
                scene.scaleMode = .aspectFill

                // pass GameViewController reference
                scene.gv_delegate = self
            }

            view.presentScene(scene)
         }

        // ...

    }

    func show_ui()
    {
        // show ui
        // ...
    }
}

// MenuScene.swift

class MenuScene: SKScene
{
    var gv_delegate : GameView_Delegate!

    func settings()
    {
        // call function show_ui from GameViewController
        gv_delegate.show_ui()
    }

    func game_scene()
    {
        let transition = SKTransition.fade(with: UIColor.white, duration: 1.0)
        let next_scene = GameScene()
        next_scene.anchorPoint = CGPoint(x: 0.5, y: 0.5)
        next_scene.scaleMode = self.scaleMode
        next_scene.size = self.size

        // before moving to next scene, we must pass the delegate, so we
        // don't  lose the connection with the GameViewController
        next_scene.gv_delegate = gv_delegate
        self.view?.presentScene(next_scene, transition: transition)
    }
}

// GameScene.swift

class GameScene: SKScene
{
    var gv_delegate : GameView_Delegate!

    func settings()
    {
        // call function show_ui from GameViewController
        gv_delegate.show_ui()
    }

    func main_scene()
    {
        let transition = SKTransition.fade(with: UIColor.white, duration: 1.0)
        let next_scene = MainScene()
        next_scene.anchorPoint = CGPoint(x: 0.5, y: 0.5)
        next_scene.scaleMode = self.scaleMode
        next_scene.size = self.size

        // before moving to next scene, we must pass the delegate, so we
        // don't lose the connection with the GameViewController
        next_scene.gv_delegate = gv_delegate
        self.view?.presentScene(next_scene, transition: transition)
    }
}

When you enter a new scene, for example GameScene, the old scene MainScene in our case is deallocated (all variables emptied, all references destroyed) and a new GameScene instance is created and displayed on screen. If afterwards you want to exit that scene and enter MainScene, a new instance of that class will be created with the GameViewController reference empty. We should reference it again or pass the reference before exiting the scene (as in my example).

// STATIC
//
// GameViewController.swift

class GameViewController: UIViewController
{
    static var shared : GameViewController!

    override func viewDidLoad()
    {
        super.viewDidLoad()

        GameViewController.shared = self

        // ...

    }

    func show_ui()
    {
        // show ui
        // ...
    }
}

// MenuScene.swift

class MenuScene: SKScene
{
    func settings()
    {
        // call function show_ui from GameViewController

        GameViewController.shared.show_ui()
    }
}

Read pros/cons of each method and chose the one that suits your app the best. Also, avoid using UIKit inside SpriteKit.

Present another View Controller from SkScene

I assume by your question that you are looking to do some social media posting.

You can either pass a reference for your View Controller to your SKScene or you can use NSNotificationCenter instead. I prefer to use the latter.

First make sure you have added the Social.framework to your project.

Import the social framework into your View Controller #import <Social/Social.h>

Then in your View Controller's viewDidLoad method add this code:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(createTweet:)
                                             name:@"CreateTweet"
                                           object:nil];

Next add this method to your View Controller:

-(void)createTweet:(NSNotification *)notification
{
    NSDictionary *tweetData = [notification userInfo];
    NSString *tweetText = (NSString *)[tweetData objectForKey:@"tweetText"];
    NSLog(@"%@",tweetText);

    // build your tweet, facebook, etc...
    SLComposeViewController *mySLComposerSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
    [self presentViewController:mySLComposerSheet animated:YES completion:nil];
}

At the appropriate location in your SKScene, (won game, lost game, etc...) add this code:

NSString *tweetText = @"I just beat the last level.";
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:tweetText forKey:@"tweetText"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"CreateTweet" object:self userInfo:userInfo];

The above code sends a NSNotification, with text, which your View Controller will pick up and execute the specified method (which is createTweet in the above example).

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