Passing Data to SKScene from UIVIewController - ios

Question

What I am trying to accomplish is (should be at least..) very simple: I want to present an SKScene with data that I have in the UIViewController that is presenting this scene. In other words, I have a variable chapter declared as the following:
#import <UIKit/UIKit.h>
#import <SpriteKit/SpriteKit.h>
#interface ViewController : UIViewController
#property (nonatomic) NSInteger chapter;
#end
I have tested with logs that the variable chapter is in fact declared (in my case i am just testing with it as 4).
Here is my ViewController.m file and how I am presenting my scene:
- (void)viewDidLoad {
[super viewDidLoad];
.
.
.
// Configure the view.
SKView *skView = (SKView *)self.view;
if (!skView.scene) {
skView.showsFPS = YES;
skView.showsNodeCount = YES;
// Create and configure the scene.
scene = [OLevel sceneWithSize:CGSizeMake(skView.bounds.size.width, skView.bounds.size.height)];
scene.scaleMode = SKSceneScaleModeResizeFill;
// Set the SKScene chapter #
scene.chapter = self.chapter; // <<<< NOT WORKING?
NSLog(#"CHAP TO PASS: %u", self.chapter);
NSLog(#"CHAP RECEIVED: %u", scene.chapter);
// Present the scene.
[skView presentScene:scene];
}
With scene defined as the following, with the viewDidLoad being the one shown above: (I have it subclassed)
#interface ViewController () {
OLevel *scene;
}
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
.
.
.
Here is my OLevel.h class:
#import <SpriteKit/SpriteKit.h>
#import <GameplayKit/GameplayKit.h>
#interface OLevel : SKScene <SKPhysicsContactDelegate, GKAgentDelegate>
#property (nonatomic) NSInteger chapter;
#end
And my OLevel.m*:
- (id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
NSLog(#"Creating scene");
NSLog(#"CHAP: %u", self.chapter);
[self setUpScene];
}
return self;
}
I am very much confused as to why this approach is not working. I have set the property in my ViewController to the desired chapter value, I have then told my Olevel what value it is and to set it's own chapter property to such value, and then present the scene correctly. Why do I continue to get 0??
2016-07-18 23:52:32.189 TESTAPP[2038:684620] CHAP TO PASS: 4
2016-07-18 23:52:32.193 TESTAPP[2038:684620] CHAP RECEIVED: 0
2016-07-18 23:52:32.195 TESTAPP[2038:684620] Creating scene
2016-07-18 23:52:32.195 TESTAPP[2038:684620] CHAP: 0
I know this question has been answered here with the same approach that I had originally used before looking for an answer, but I have yet to get it to work..
If anyone knows what I am doing wrong please help me.

Answer 1

You have initialize your scene with the wrong syntax, without type:
...
// Create and configure the scene.
OLevel *scene = [OLevel sceneWithSize:CGSizeMake(skView.bounds.size.width, skView.bounds.size.height)];
scene.scaleMode = SKSceneScaleModeResizeFill;
// Set the SKScene chapter #
scene.chapter = self.chapter;
...
If you want you can also subclass init method with chapter
OLevel.h:
#interface GameScene : SKScene <SKPhysicsContactDelegate, GKAgentDelegate>
#property (nonatomic) NSInteger chapter;
-(id)initWithSize:(CGSize)size chapter:(NSInteger)chapter;
+(id)sceneWithSize:(CGSize)size chapter:(NSInteger)chapter;
#end
OLevel.m:
#import "GameScene.h"
#implementation GameScene
-(id)initWithSize:(CGSize)size chapter:(NSInteger)chapter {
if (self = [super initWithSize:size]) {
self.chapter = chapter;
//some custom code here
NSLog(#"Creating scene");
NSLog(#"CHAP: %ld", (long)self.chapter);
}
return self;
}
+(id)sceneWithSize:(CGSize)size chapter:(NSInteger)chapter {
return ((GameScene *)[[self alloc] initWithSize:size chapter:chapter]);
}
-(void)didMoveToView:(SKView *)view {
...
}
}
In this case you can create your scene as:
// Create and configure the scene.
scene = [OLevel sceneWithSize:CGSizeMake(skView.bounds.size.width, skView.bounds.size.height) chapter:self.chapter];
scene.scaleMode = SKSceneScaleModeResizeFill;

Answer 2

You can also try to pass your data using the NSNotificationCenter
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(receiveTestNotification:)
name:#"TestNotification"
object:nil];
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:myObject forKey:#"someKey"];
[[NSNotificationCenter defaultCenter] postNotificationName: #"TestNotification" object:nil userInfo:userInfo];