swift - SKshapenode 没有响应 Physicsbody

Question

我创建了一个 SKShapeNode 并为其分配了一个 physicsBody。但是，当有接触时它不会被触发。

创建SKShapeNode代码:

-(SKShapeNode*)gravityline{
    //SKSpriteNode *lolo=[[SKSpriteNode alloc]init];
    SKShapeNode *lolo = [[SKShapeNode alloc] init];
    CGPoint fff=CGPointMake(ray1.position.x, ray1.position.y);
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, fff.x, fff.y);
    CGPathAddLineToPoint(path, 0,rayoriginpoint.x,rayoriginpoint.y );
    CGPathCloseSubpath(path);
    lolo.path = path;
    lolo.name=@"gravityline";
    lolo.strokeColor=[SKColor greenColor];
    lolo.glowWidth=.1;
    CGPathRelease(path);
    lolo.physicsBody=[SKPhysicsBody bodyWithEdgeFromPoint:fff toPoint:rayoriginpoint];
    //lolo.physicsBody=[SKPhysicsBody bodyWithEdgeLoopFromPath:path];
    //lolo.physicsBody=[SKPhysicsBody bodyWithPolygonFromPath:path];
    lolo.physicsBody.categoryBitMask=raylightCategory;
    lolo.physicsBody.collisionBitMask=batCategory;
    lolo.physicsBody.contactTestBitMask=batCategory;
    lolo.physicsBody.usesPreciseCollisionDetection=YES;
    lolo.physicsBody.linearDamping=0;
    lolo.physicsBody.restitution=1.0;
    lolo.physicsBody.dynamic=NO;

    return lolo;
}

这是触发代码:

- (void)didBeginContact:(SKPhysicsContact *)contact
{
    SKPhysicsBody *firstBody, *secondBody;
    if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask)
    {
        firstBody = contact.bodyA;
        secondBody = contact.bodyB;
    }
    else
    {
        firstBody = contact.bodyB;
        secondBody = contact.bodyA;
    }
    if (firstBody.categoryBitMask == raylightCategory && secondBody.categoryBitMask==batCategory)
    {
        NSLog(@"Contact with bat have been made");
        [secondBody.node removeFromParent];
    }
}

如果有人知道我做错了什么，为什么 SKShapeNode 没有激活 physicsBody，请告诉我。

Answer 1

这肯定行不通:

lolo.physicsBody=[SKPhysicsBody bodyWithEdgeFromPoint:fff toPoint:rayoriginpoint];

如果有的话，这将返回一个已经分配给不同节点的主体。但我猜它只是返回 nil。

这条注释行也不起作用:

//lolo.physicsBody=[SKPhysicsBody bodyWithEdgeLoopFromPath:path];

边缘形状将创建静态(如:不可移动的)物体。因此，该节点不会在物理中移动，如果我没记错的话，您也不会从与静态物体的接触中获得接触响应，只有动态物体。

这个应该可以工作:

//lolo.physicsBody=[SKPhysicsBody bodyWithPolygonFromPath:path];

但是你在这里将 body 设置为静态 body :

lolo.physicsBody.dynamic=NO;

因此，适用相同的规则，就好像您正在创建带边循环的主体一样。