检测两根手指[iOS]

Question

我有一个游戏，当发生两次轻击时玩家跳跃。 问题是我不能禁用用两根手指敲击的功能，你可以用两根手指双击来双击。

-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {

                //if you tap twice && you stay on ground SO...
                    if (touch.tapCount == 2 && footContacts > 0)
                    {
                        [player jump];
                    }

               tapBegan = TRUE;
               return tapBegan;
            }