ios - SKPhysicsBody 大小与 resizeToHeight

Question

调整他的 skspritenode 的大小后，我对物理体的大小有疑问。

我的代码：

backTop.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:backTop.size];
[backTop.physicsBody setAffectedByGravity:NO];
[backTop.physicsBody setDynamic:NO];
[backTop.physicsBody setCategoryBitMask:kPipeCategory];
[backTop.physicsBody setCollisionBitMask:kPlayerCategory];
backTop.physicsBody.usesPreciseCollisionDetection = YES;

//SKAction
SKAction *scaleBackTopActionStart = [SKAction resizeToHeight:backTop.size.height+kPipeGap duration:kPipeScale];
SKAction *scaleBackTopActionEnd = [SKAction resizeToHeight:pipeTop.size.height duration:kPipeScale];
SKAction *scaleBackTopSequence = [SKAction sequence:@[[SKAction waitForDuration:kPipeScaleStartWait],scaleBackTopActionStart, scaleBackTopActionEnd, [SKAction waitForDuration:kPipeScaleWait]]];

问题：

skspritenode 已调整大小，但他的物理体不跟随。你有想法吗？

Answer 1

比例只是一种视觉属性，它不适用于物理物体。除了创建具有适当缩放形状的新物体外，没有其他方法可以缩放物理物体。

Answer 2

通过@LearnCocos2D 评论，我发现了这个变化（改变高度元素并移动它：

SKSpriteNode *backTop = [SKSpriteNode spriteNodeWithColor:[UIColor whiteColor] size:CGSizeMake(pipeTop.size.width,pipeTop.size.height+kPipeGap)];
[backTop setCenterRect:CGRectMake(26.0/kPipeWidth, 26.0/kPipeWidth, 4.0/kPipeWidth, 4.0/kPipeWidth)];
[backTop setPosition:CGPointMake(self.size.width+(pipeTop.size.width/2), self.size.height-(pipeTop.size.height/2)+(kPipeGap/2))];

SKAction *scaleBackTopActionStart = [SKAction moveToY:backTop.position.y-kPipeGap/2 duration:kPipeScale];
SKAction *scaleBackTopActionEnd = [SKAction moveToY:backTop.position.y duration:kPipeScale];