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I'm trying to create a sprite of a random monster where my images are stored in a folder referenced within the main bundle. 

NSString* bundlePath = [[NSBundle mainBundle] bundlePath];
NSString* resourceFolderPath = [NSString stringWithFormat:@"%@/monsters", bundlePath];

NSArray* resourceFiles = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:resourceFolderPath  error:nil];

NSInteger randomFileIndex = arc4random() % [resourceFiles count];
NSString* randomFile = [resourceFiles objectAtIndex:randomFileIndex];

SKSpriteNode* tile = [SKSpriteNode spriteNodeWithImageNamed:randomFile];

When I run my code above, I get this error

SKTexture: Error loading image resource: "random_monster.png"

The code works if I reference the image from the main bundle. How can I use a random image from a folder within the app bundle and pass it to SKSpriteNode?

Alex Stone
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2 Answers2

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In that case you can't use the spriteNodeWithImageNamed: method. You have to create the texture yourself from an absolute path and initialize your sprite with that texture:

NSImage *image = [[NSImage alloc] initWithContentsOfFile:absolutePath];
SKTexture *texture = [SKTexture textureWithImage:image];
SKSpriteNode *sprite = [SKSpriteNode spriteNodeWithTexture:texture];

Note that doing so you will lose the performance optimizations that come with using spriteNodeWithImageNamed: (such as caching and better memory handling)

I recommend putting your images in the main bundle and use a specific naming scheme like this:

monster_001.png
monster_002.png
monster_003.png
etc...

Alternatively, consider using texture atlases.

DrummerB
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  • Yeah, I just found out how to do this using texture atlases: http://www.raywenderlich.com/45152/sprite-kit-tutorial-animations-and-texture-atlases – Alex Stone Nov 30 '13 at 19:26
  • Is there any source on the spriteNodeWithImageNamed that explains exactly what other stuff it is doing? – MetaGuru Mar 14 '14 at 19:19
0

Actually [SKSpriteNode spriteNodeWithImageNamed:] works for me using an absolute path, at least on OSX 10.9. I'm working on a project where I need to access resources outside the app bundle and it's doing the job without needing SKTexture or NSImage.

Try it :D

NSString *imagePath = @"~/Desktop/test.png";
SKSpriteNode *test = [SKSpriteNode spriteNodeWithImageNamed:[imagePath stringByExpandingTildeInPath]];
danomatika
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