訪問所有具有相同類別的單個對象BitBitMask

我有幾個遊戲世界對象，玩家需要在他的physicsBody.categoryBitMask與他們聯繫時單獨進行交互。而不是爲每個單獨的對象使用單獨的categoryBitMasks（對象數超過categoryBitMask的限制，即32），我只使用1個categoryBitMask並給所有對象個別名稱。下面是它的外觀在代碼：訪問所有具有相同類別的單個對象BitBitMask

-(void)createCollisionAreas 
{ 
    if (_tileMap) 
    { 
     TMXObjectGroup *group = [_tileMap groupNamed:@"ContactZone"]; //Layer's name. 

     //Province gateway. 
     NSDictionary *singularObject = [group objectNamed:@"msgDifferentProvince"]; 
     if (singularObject) 
     { 
      CGFloat x = [singularObject[@"x"] floatValue]; 
      CGFloat y = [singularObject[@"y"] floatValue]; 
      CGFloat w = [singularObject[@"width"] floatValue]; 
      CGFloat h = [singularObject[@"height"] floatValue]; 

      SKSpriteNode *object = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(w, h)]; 
      object.name = @"provinceGateway"; 
      object.position = CGPointMake(x + w/2, y + h/2); 

      object.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(w, h)]; 

      object.physicsBody.categoryBitMask  = terrainCategory; 
      object.physicsBody.contactTestBitMask = playerCategory; 
      object.physicsBody.collisionBitMask  = 0; 
      object.physicsBody.dynamic = NO; 
      object.physicsBody.friction = 0; 
      object.hidden = YES; 

      [_backgroundLayer addChild:object]; 
     } 

     /*More code written below. Too lazy to copy & paste it all*/ 
} 

-(void)didBeginContact:(SKPhysicsContact *)contact 
{ 
    SKPhysicsBody *firstBody, *secondBody; //Create 2 placeholder reference's for the contacting objects. 

    if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) //If bodyA has smallest of 2 bits... 
    { 
     firstBody = contact.bodyA; //...it is then the firstBody reference [Smallest of two (category) bits.]. 
     secondBody = contact.bodyB; //...and bodyB is then secondBody reference [Largest of two bits.]. 
    } 
    else //This is the reverse of the above code (just in case so we always know what's what). 
    { 
     firstBody = contact.bodyB; 
     secondBody = contact.bodyA; 
    } 


    /**BOUNDARY contacts*/ 
    if ((firstBody.categoryBitMask == noGoCategory) && (secondBody.categoryBitMask == playerCategory)) 
    { 
     //Boundary contacted by player. 
     if ([_backgroundLayer childNodeWithName:@"bounds"]) 
     { 
      NSLog(@"Player contacted map bounds."); 
     } 
     if ([_backgroundLayer childNodeWithName:@"nogo"]) 
     { 
      NSLog(@"Player can't go further."); 
     } 
     if ([_backgroundLayer childNodeWithName:@"provinceGateway"]) 
     { 
      NSLog(@"Another province is ahead. Can't go any further."); 
     } 
     if ([_backgroundLayer childNodeWithName:@"slope"]) 
     { 
      NSLog(@"Player contacted a slope."); 
     } 
}

的問題是，在didBeginContact方法，當所有的代碼被執行玩家接觸的任何對象。即使是玩家尚未聯繫的對象的代碼。這意味着IF語句（如if（[_backgroundLayer childNodeWithName：@「slope」]）不完整。有人可以告訴我如何正確寫出用於單個對象聯繫的IF語句嗎？

if ([_player intersectsNode:[_backgroundLayer childNodeWithName:@"slope"]])

來源

2015-06-25 Krekin

你if陳述都只是檢查，如果孩子存在，這似乎他們都做：IF語句，裏面didBeginContact，無法正常工作或以下。我想你想檢查是如果碰撞節點有您正在尋找的名字，所以更改：

if ([_backgroundLayer childNodeWithName:@"bounds"])

到：

if ([firstBody.node.name isEqualToString:@"bounds"])

來源

2015-06-25 17:14:37

好吧，這個工作！非常感謝你。 – Krekin

唉，這個作品如此完美我得說再次感謝你：D – Krekin

不客氣;） –

訪問所有具有相同類別的單個對象BitBitMask

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