didBeginContact没有被调用一个spritenode

Question

didbegincontact没有被称为powerup令牌 - 其他spritenodes工作正常。例如玩家（飞机）联系直升机工作正常。玩家（飞机）接通电源令牌，没有任何事情发生（没有接到电话）。我已将面罩更换为直升机，但仍不起作用。节点类别掩码的数量是否有限制？我几天前一直在这个问题上停滞不前。

//zpositions 
float playerZ = .08; 
float enemyZ = .08; 
float explosionZ = .08; 
float tokenz = .08; 

//category bit masks 
#define playermask 1 
#define enemymask 2 
#define bulletmask 3 
#define tokenmask 9 

    //add plane 
    SKSpriteNode *plane = [SKSpriteNode spriteNodeWithImageNamed:@"jet"]; 
    plane.position = CGPointMake(160, 80); 
    plane.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:plane.size]; 
    //plane.size = CGSizeMake(15,25); 
    plane.physicsBody.dynamic = NO; 
    plane.physicsBody.affectedByGravity = NO; 

    //collision configuration - need to fine tune later 
    plane.physicsBody.categoryBitMask = playermask; 


    plane.physicsBody.collisionBitMask = playermask | enemymask | tokenmask; 
    plane.physicsBody.contactTestBitMask = playermask; 
    plane.physicsBody.usesPreciseCollisionDetection = YES; 
    [self addChild:plane]; 

    plane.zPosition = playerZ; 

    player = plane; 

    self.physicsWorld.gravity = CGVectorMake(0.0, 0.0); 

    self.physicsWorld.contactDelegate = self; 

    //////// TESTING TESTING TESTING ----- Delete After 
    [self powerUp]; 
      temp.position = CGPointMake(160, 160); 


    SKAction *makeHelis = [SKAction sequence:@[[SKAction waitForDuration:1.50  withRange:0.35], 
               [SKAction performSelector:@selector(helicopterEnemies) onTarget:self]]]; 
    [self runAction: [SKAction repeatActionForever:makeHelis]]; 

    //method call for spawning power up tokens 

    SKAction *makeTokens = [SKAction sequence:@[[SKAction waitForDuration:25.50 withRange:0.35], 
               [SKAction performSelector:@selector(powerUp) onTarget:self]]]; 
    [self runAction: [SKAction repeatActionForever:makeTokens]]; 

- (SKSpriteNode*)helicopterEnemies 
{ 
    //Helicopter setup 

    SKSpriteNode *heli = [SKSpriteNode spriteNodeWithImageNamed:@"heli"]; 
      heli.size = CGSizeMake(18,18); 

    heli.position = CGPointMake(skRand(100, 250), 
           self.size.height-50); 
    heli.name = @"helicopter"; 
    heli.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:heli.size]; 

    //need to work on these numbers to coordinate with the other sprites 
    heli.physicsBody.categoryBitMask = enemymask; 
    heli.physicsBody.collisionBitMask = enemymask | bulletmask; 
    heli.physicsBody.contactTestBitMask = bulletmask; 

    heli.physicsBody.usesPreciseCollisionDetection = YES; 
    heli.physicsBody.dynamic = YES; 
    heli.physicsBody.affectedByGravity = NO; 

    //useless except to show you could change this 
    //heli.physicsBody.affectedByGravity = YES; 
    [self addChild:heli]; 

    SKAction *moveDownThenDie = [SKAction sequence:@[ 
                [SKAction waitForDuration:0.10 withRange:0.35], 
                [SKAction moveByX:0.0 y:-1600 duration:25], 
                [SKAction removeFromParent]]]; 
    heli.zPosition = enemyZ; 
    [heli runAction: moveDownThenDie]; 

    return heli; 
} 

- (SKSpriteNode*)powerUp 
{ 
    //Power token setup 

    SKSpriteNode *powerToken = [SKSpriteNode spriteNodeWithImageNamed:@"powerup"]; 
    //powerToken.size = CGSizeMake(18,18); 

    powerToken.position = CGPointMake(skRand(100, 250), 
           self.size.height-50); 
    powerToken.name = @"Token"; 
    powerToken.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:powerToken.size]; 

    //need to work on these numbers to coordinate with the other sprites 
    powerToken.physicsBody.categoryBitMask = tokenmask; 
    powerToken.physicsBody.collisionBitMask = tokenmask | playermask; 
    powerToken.physicsBody.contactTestBitMask = playermask; 

    powerToken.physicsBody.usesPreciseCollisionDetection = YES; 
    powerToken.physicsBody.dynamic = NO; 
    powerToken.physicsBody.affectedByGravity = NO; 

    [self addChild:powerToken]; 

    SKAction *moveDownThenDie = [SKAction sequence:@[ 
                [SKAction waitForDuration:0.10 withRange:0.35], 
                [SKAction moveByX:0.0 y:-1600 duration:25], 
                [SKAction removeFromParent]]]; 
    powerToken.zPosition = tokenz; 
    [powerToken runAction: moveDownThenDie]; 

    temp = powerToken; 
    return powerToken; 
} 

Answer 1

找到了我的问题的答案...动力被设置为NO为上电的令牌对象。此禁用的spritekit无法检查此对象上的碰撞检测。

powerToken.physicsBody.dynamic = NO;