多重碰撞spritekit

Question

我正在尝试制作一款SpriteKit游戏，但我无法找到或找到多个碰撞检测的好例子。
我的代码:

-(void)didBeginContact:(SKPhysicsContact *)contact{
SKPhysicsBody *firstBody;
SKPhysicsBody *secondBody;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask)
{
    firstBody = contact.bodyA;
    secondBody = contact.bodyB;
}
else
{
    firstBody = contact.bodyB;
    secondBody = contact.bodyA;
}
if ((firstBody.categoryBitMask & bulletCategory) != 0) {
    [self updateScore];
    SKNode *applenode = [self childNodeWithName:(@"Apple")];
    applenode.removeFromParent;
    [self updateScore];
    SKScene *sampleScene = [[Level2 alloc] initWithSize:self.size];
    SKTransition *transition = [SKTransition flipVerticalWithDuration:0.5];
    [self.view presentScene:sampleScene transition:transition];
}

在一次碰撞中工作得很好，但我似乎不能让它多次工作。

Answer 1

//对于多重碰撞，你可以添加像

这样的代码

• (void) didBeginContact: (SKPhysicsContact *)接触{

  CGPoint contactPoint=CGPointMake(0, 0);
  //multiple collision
  if (contact.bodyA.categoryBitMask || contact.bodyB.categoryBitMask)
  {
      //first collision
      if(([contact.bodyA.node.name isEqualToString:@"hero"] && [contact.bodyB.node.name isEqualToString:@"coin"] ) || ([contact.bodyA.node.name isEqualToString:@"coin"] && [contact.bodyB.node.name isEqualToString:@"hero"]) )
      {
          if([contact.bodyA.node.name isEqualToString:@"coin"] )
          {
              [contact.bodyA.node removeFromParent];
          }
          else
          {
              [contact.bodyB.node removeFromParent];
          }
      }
      //second collision
      else if(([contact.bodyA.node.name isEqualToString:@"hero"] && [contact.bodyB.node.name isEqualToString:@"enemy"] ) || ([contact.bodyA.node.name isEqualToString:@"enemy"] && [contact.bodyB.node.name isEqualToString:@"hero"]) )
      {
          if([contact.bodyA.node.name isEqualToString:@"hero"] )
          {
              [contact.bodyA.node removeFromParent];
          }
          else
          {
              [contact.bodyB.node removeFromParent];
          }
      }
  }
  

  }