Having issue with SKEffectNode

Question

I am following Apple's SpriteKit documentation, now I am trying to use SKEffectNode, but my problem is the effect will not be applied! Here is my code :

SKEffectNode *lightingNode = [[SKEffectNode alloc] init];
SKTexture *texture = [SKTexture textureWithImage:[UIImage imageNamed:@"Spaceship"]];
SKSpriteNode *light = [SKSpriteNode spriteNodeWithTexture:texture];
self.filter = [self blurFilter];
lightingNode.position = self.view.center;
lightingNode.blendMode = SKBlendModeAdd;
[lightingNode addChild: light];
[self addChild:lightingNode];

//applying blur 

- (CIFilter *)blurFilter
{
    CIFilter *filter = [CIFilter filterWithName:@"CIBoxBlur"]; // 3
    [filter setDefaults];
    [filter setValue:[NSNumber numberWithFloat:20] forKey:@"inputRadius"];
    return filter;
}

When you run the app it just show spaceship without any blur effect.

Answer 1

It looks like @"CIBoxBlur" filter doesn't exist anymore, at least in iOS 7.0. You can use @"CIGaussianBlur". You can see full list of the filters by running:

    NSArray* filters = [CIFilter filterNamesInCategories:nil];
    for (NSString* filterName in filters)
    {
        NSLog(@"Filter: %@", filterName);
    }