Sprite Kit 按 Y 转节点

Question

我有 2 个节点：SKShapeNode coin 和 SKSpriteNode hero，带有委托和 didBeginContact 方法。联系工作正常，但在我反转我的英雄纹理后，节点不交互。 逻辑是：英雄是上线，下线和上线定位硬币。当 hero 上线时一切正常，但是当我使用 changeHeroSide 方法时， hero 反转并下线，didBeginContact 方法没有响应。

- (void)changeHeroSide
{            
        self.yScale = -fabs(self.yScale); // this part don't interact under line

/** BUT THIS PART WORKS WELL AND INTERACTS UNDER LINE  
            self.zRotation = M_PI;
            self.xScale = fabs(self.xScale);     
**/

        self.position = CGPointMake(self.position.x, self.position.y - self.frame.size.height);
        self.physicsBody.affectedByGravity = NO;

}

创建节点

 - (void)create
    {
        self.hero = [[VZHero alloc] initAtPosition:CGPointZero withPlayer:nil];
        self.hero.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.hero.frame.size];
        self.hero.xScale = -fabs(self.hero.xScale);

        SKShapeNode *platform = [self getCurrentPlatform];
        self.hero.position = CGPointMake([self getHeroEdgeXCoordinateForPlatform:platform], platform.frame.size.height + _hero.frame.size.height/2);

        self.hero.physicsBody.dynamic = YES;
        self.hero.physicsBody.categoryBitMask = monsterCategory;
        self.hero.physicsBody.contactTestBitMask = projectileCategory;
        self.hero.physicsBody.usesPreciseCollisionDetection = YES;
        [self addChild:self.hero atWorldLayer:VZWorldLayerCharacter];

      SKShapeNode *coin = [SKShapeNode shapeNodeWithCircleOfRadius:radius];
        coin.name = @"coin";
        coin.strokeColor = [SKColor blackColor];
        coin.fillColor = [SKColor yellowColor];
        coin.lineWidth = 1;
        coin.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:radius];
        coin.physicsBody.dynamic = NO;
        coin.position = pos;
        coin.physicsBody.categoryBitMask = projectileCategory;
        coin.physicsBody.contactTestBitMask = monsterCategory;
    //    coin.physicsBody.collisionBitMask = 0;
        coin.physicsBody.usesPreciseCollisionDetection = YES;

        [self addChild:coin atWorldLayer:VZWorldLayerCharacter];
    }

Answer 1

以这种方式镜像 y 比例会破坏物理体属性。看起来像 SpriteKit 中的一个错误（至少在 iOS 7 上）。您可以通过将精灵包装在容器节点中来解决此问题。 This 相关问题可能会有所帮助。