将精灵添加到其他精灵位置

Question

我有两个body

SKShapeNode *hero = [SKShapeNode shapeNodeWithCircleOfRadius:HERO_SIZE];
hero.lineWidth = 1;
hero.fillColor = [SKColor orangeColor];
hero.name = @"Hero";

    hero.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:HERO_SIZE];
    hero.physicsBody.categoryBitMask = hero;
    hero.physicsBody.collisionBitMask = friendlyCategory | enemyCategory;
    hero.physicsBody.contactTestBitMask = friendlyCategory | enemyCategory;       

    hero.position = [self getStartPosition];


  SKShapeNode *circle = [SKShapeNode shapeNodeWithCircleOfRadius:BALL_SIZE];
    circle.position = [self randomPossition];
    circle.lineWidth = 2;
    circle.strokeColor = [SKColor blueColor]; 
    circle.fillColor = color;
    circle.name = @"Circle"; 
    circle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:BALL_SIZE];
    circle.physicsBody.categoryBitMask = friendlyCategory;


    circle.physicsBody.collisionBitMask = hero;
    circle.physicsBody.contactTestBitMask = hero;

然后，

- (void)didEndContact:(SKPhysicsContact *)contact
{
 uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
    if (collision == (friendlyCategory | hero ))
    {
 SKShapeNode* node = (SKShapeNode*)contact.bodyA.node;

        if ([node.name isEqualToString:@"Hero"])
        {
            self.activeFriendlyBall = (SKShapeNode*)contact.bodyB.node;
        }
        else
        {
            self.activeFriendlyBall = (SKShapeNode*)contact.bodyA.node;
        }



           self.hero.position = self.activeFriendlyBall.position;

}
}

Hero 必须添加到 activeFriendlyBall 上面，让他处于中心位置。但它在他附近增加了。我认为这是因为 physic body 添加了。但是我需要使用 physic body 来进行其他逻辑。

http://cl.ly/image/0g1S0d3h1h0w

一定是这样的，怎么上屏。

Answer 1

我相信这是因为您为两者都启用了碰撞检测，这意味着它们不能相互叠加。如果您只是想确定一个精灵是否与另一个精灵接触，您所需要的就是接触检测。从碰撞检测位掩码中删除 hero 或 friendlyball 将允许它们被放置在每个 other/go 之上，通过彼此等

如果您根本不关心其中之一的碰撞（该精灵不会 'bounce' 关闭任何东西）我建议您将该精灵的碰撞检测设置为 0。

最佳

Answer 2

我找到了解决方案。

self.heroBall.physicsBody.velocity = CGVectorMake(0, 0);
[self.heroBall runAction: [SKAction moveTo:self.activeFriendlyBall.position duration:0.0]];

将精灵添加到其他精灵位置

Add sprite to other sprite position

iphone

gamekit

ios

skshapenode