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我正在尝试在 SKSpriteNode 上执行一些操作，该 SKSpriteNode 与其在 SKNode 中的阴影分组。翻译工作正常，但旋转仍然是一个问题。

我实现了如下添加阴影：

- (SKNode *) addShadow:(NSString *) nodeName At:(CGPoint) pos
{
    float halfWdth = self.frame.size.width / 2.f;
    float halfHght = self.frame.size.height / 2.f;

    SKEffectNode *shadowEffect = [[SKEffectNode alloc] init];
    shadowEffect.shouldEnableEffects = YES;

    SKNode *shadowNode = [[SKNode alloc] init];

    SKSpriteNode *shadow = [self copy];
    shadow.color = [SKColor blackColor];
    shadow.colorBlendFactor = 0.9;
    shadow.blendMode = SKBlendModeAlpha;
    [shadow setAlpha:0.7];
    shadowEffect.filter = [self blurFilter];
    shadow.position = CGPointMake(halfWdth + SHADOW_DELTA, halfHght);
    shadow.zPosition = -10;
    shadowEffect.name = @"shadow";
    shadowEffect.blendMode = SKBlendModeAlpha;
    [shadowEffect addChild:shadow];

    self.zPosition = 3;
    self.position = CGPointMake(halfWdth, halfHght + SHADOW_DELTA);

    [shadowNode addChild:shadowEffect];
    [shadowNode addChild:self];

    shadowNode.name = nodeName;
    shadowNode.position = pos;
    shadowNode.zPosition = 3;

    SKNode *container = [[SKNode alloc] init];
    container.name = nodeName;

    CGRect groupRect = [shadowNode calculateAccumulatedFrame];
    halfWdth = groupRect.size.width / 2.f;
    halfHght = groupRect.size.height / 2.f;

    shadowNode.position = CGPointMake(-halfWdth, -halfHght);

   [container addChild:shadowNode];
   container.position = CGPointMake(pos.x + halfWdth, pos.y + halfHght);

   return (container);

}

我找到了链接Rotate and scale the POSITION of several sprites based on a center point? . 但是，我无法解决我的问题。

我使用以下代码段进行平移和旋转；

翻译：

 SKAction *moveAction = [SKAction moveBy:CGVectorMake(-2.f, mMoveY) duration:0.2f];

 [paper runAction:moveAction completion:
 ^{
      [self processHelp:@"help3];     
  }];

回转：

 SKAction *rotateAction = [SKAction rotateByAngle:0.75f * M_PI duration:0.4f];
[mainNode runAction:rotateAction];

如果有人可以指导我，我会很高兴。

问候，

内斯丽莎。

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