Is there a way to invert the colors of a SKSpriteN

问题:

I was wondering if it was possible to invert the colors (or adjust the hue) of a SKSpriteNode.

回答1:

You can invert the colors by applying a CIFilter with an SKEffect node. Something like this should work:

SKEffectNode *effectNode = [[SKEffectNode alloc] init];
effectNode.filter = [CIFilter filterWithName:@"CIColorInvert"];

SKSpriteNode *node = yourNode; // Make sure this node doesn't already have a parent
[effectNode addChild:node];
[self addChild:effectNode];

Note that an SKScene is an effect node, so this makes inverting an entire scene very easy:

// self is a scene here
self.filter = [CIFilter filterWithName:@"CIColorInvert"];
self.shouldEnableEffects = YES;