Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS

Posted by Simone Giuditta
Simone Giuditta
1,443 Points

SpriteKit course in Xcode 6

Hello, I m trying to follow along the Spritekit course but unfortunately my starting code is different since I'm using Xcode 6. When i try to add the green cube i get nothing on screen and the view seems to unarchive the .sks file in the project which i don't get what is for. Can i follow along anyway? if so how? Thank you =)

The code I'm using is 

-(void)didMoveToView:(SKView *)view {
    /* Setup your scene here */
    SKSpriteNode *greenNode = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:CGSizeMake(100, 100)];
    [self addChild:greenNode];
}

that's just the code used by the teacher so I don't think the problem is this ;)

3 Answers

agreatdaytocode
agreatdaytocode
24,757 Points
agreatdaytocode
agreatdaytocode
24,757 Points

Hello Simone,

Try adding a position to your "greenNode"

Below is an example in swift.

  var box = SKSpriteNode()

override func didMoveToView(view: SKView) {
//box
   box.color = UIColor .greenColor()
   box.size = CGSizeMake(100, 100)
   box.position = CGPointMake(500, 280) 
   self.addChild(box)

}
Simone Giuditta
Simone Giuditta
1,443 Points

Hi, thank you for answering =) I solved the problem deleting all the code in the project that was different from the iOS 7 SpriteKit template and the .sks file. Then I initialized the gamescene as it is in iOS 7 and everything started working ;)

agreatdaytocode
agreatdaytocode
24,757 Points

Awesome. Glad you got it to work.

Alejandro Chiari
Alejandro Chiari
1,981 Points

Simone how did you do that? I'm doing the same course and had the same problem but didn't understand what you did.

Thanks

Alex Romanillos
Alex Romanillos
16,144 Points
Alex Romanillos
Alex Romanillos
16,144 Points

In the Xcode6 Sprite Game boilerplate they added a visual interface in the GameScene.sks file, that works almost the same as the Storyboard for interface building. So in this case to add the SpriteNode you can do it using the GameScene.sks tool.

In the GameViewController.m the GameScene object is loaded from the GameScene.sks file, as seen in the code below.

@implementation SKScene (Unarchive)

+(instancetype)unarchiveFromFile:(NSString *)file {

    /* Retrieve scene file path from the application bundle */
    NSString *nodePath = [[NSBundle mainBundle] pathForResource:file ofType:@"sks"];
    /* Unarchive the file to an SKScene object */
    NSData *data = [NSData dataWithContentsOfFile:nodePath
                                          options:NSDataReadingMappedIfSafe
                                            error:nil];
    NSKeyedUnarchiver *arch = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    [arch setClass:self forClassName:@"SKScene"];
    SKScene *scene = [arch decodeObjectForKey:NSKeyedArchiveRootObjectKey];
    [arch finishDecoding];
    return scene;
}
@end

@implementation GameViewController

-(void)viewDidLoad{
    [super viewDidLoad];
    // Configure the view.
    SKView * skView = (SKView *)self.view;
    skView.showsFPS = YES;
    skView.showsNodeCount = YES;
    /* Sprite Kit applies additional optimizations to improve rendering performance */
    skView.ignoresSiblingOrder = YES;
    // Create and configure the scene.
    GameScene *scene = [GameScene unarchiveFromFile:@"GameScene"];
    scene.scaleMode = SKSceneScaleModeAspectFill;
    // Present the scene.
    [skView presentScene:scene];
}
eric hughes
eric hughes
12,345 Points
eric hughes
eric hughes
12,345 Points

could somebody help me with this, I removed the GameScene.sks file from my project and copy pasted this code into the gameviewcontroller.m file and my build wont run. Doing this course on xcode 6 is very confusing, this is the error that I have inside my console even though the build is successful

2015-01-08 16:11:34.608 SpaceCat[6045:8243532] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[_NSPlaceholderData initWithContentsOfFile:options:error:]: nil file argument'