未检测到碰撞答案

【问题标题】：Collision not being detected未检测到碰撞
【发布时间】：2014-05-15 21:05:23
【问题描述】：

我有两个精灵，我的玩家和一堵墙（来自瓷砖地图）发生碰撞。下面我粘贴了播放器和墙的代码

Player.m
    - (instancetype)init {
        SKTextureAtlas *atlas =
        [SKTextureAtlas atlasNamed: @"char"];
        SKTexture *texture = [atlas textureNamed:@"player"]; texture.filteringMode = SKTextureFilteringNearest;
        if (self = [super initWithTexture:texture])
        { self.name = @"player";
            CGFloat minDiam = MIN(self.size.width, self.size.height);
            minDiam = MAX(minDiam-16, 4);
            self.physicsBody =
            [SKPhysicsBody bodyWithCircleOfRadius:minDiam/2.0];
            self.physicsBody.categoryBitMask=PCPlayerCategory;    
            self.physicsBody.collisionBitMask =
            PCWallCategory;
            self.physicsBody.allowsRotation = NO;
            self.physicsBody.restitution = 0;
            self.physicsBody.friction = 0;
            self.physicsBody.linearDamping = 0;
        }
        return self;
    }

tilemap.m

        SKSpriteNode *tile = [layer tileAtCoord:coord];
        tile.name=@"wall";
        tile.physicsBody =
        [SKPhysicsBody bodyWithRectangleOfSize:tile.size];
        tile.physicsBody.categoryBitMask = PCWallCategory;
          tile.physicsBody.collisionBitMask =
          PCPlayerCategory;
        tile.physicsBody.dynamic = NO;
        tile.physicsBody.friction = 0;
          tile.physicsBody.restitution=0;

在我的 mainscene.m 中

- (void)didBeginContact:(SKPhysicsContact *)contact {
  uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
  if (collision == (PCWallCategory|PCPlayerCategory)) {
    NSLog(@"SUCCESS"); }

但是，即使我的播放器坐在我的墙上，我也看不到 NSLog 出现，希望得到一些帮助和洞察力。谢谢

- (void)didBeginContact:(SKPhysicsContact *)contact {
  uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
  if (collision == (PCWallCategory|PCPlayerCategory)) {

    NSLog(@"SUCCESS");
    onGround=YES;
  }else
  {
    onGround=NO;
  }

}

【问题讨论】：

categoryBitMask使用不正确...stackoverflow.com/a/22804376/201863
您需要使用相同的值设置contactTestBitMask，而不是collisionBitMask。
@LearnCocos2D 感谢阅读它解决了我的问题

标签： xcode5 sprite-kit

【解决方案1】：

collisionTestBitMask 只定义了哪些类型的物体可以与physicsBody 发生碰撞。为了在两个body碰撞时触发contact delegate，需要设置contactTestBitMask。

所以，physicsBody 应该这样定义：

self.physicsBody.categoryBitMask=PCPlayerCategory;    
self.physicsBody.contactTestBitMask = PCWallCategory;

【讨论】：