ios - 在节点中使用 sprite kit 问题进行游戏开发？

Question

当用户触摸屏幕时，从 y 轴的中间创建 SKSpriteNode 图像，x 轴为零。 SKSpriteNode 图像到达触摸位置。它工作正常。当用户连续多次触摸多个 SKSpriteNode 图像时，多个 SKSpriteNode 图像被创建但多个 SKSpriteNode 图像相互碰撞然后角度发生变化，除了第一张图像。我需要图像一个接一个地移动而不改变角度。

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
      UITouch * touch = [touches anyObject];

      CGPoint location = [touch locationInNode:self];

    SKSpriteNode * projectile = [SKSpriteNode spriteNodeWithImageNamed:@"Arrow_Ballon"];
    projectile.position = self.player.position;
    projectile.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:projectile.frame.size];
    projectile.physicsBody.categoryBitMask = projectileCategory;
    projectile.physicsBody.contactTestBitMask = monsterCategory;
    projectile.physicsBody.collisionBitMask = projectileCategory | monsterCategory;
    projectile.physicsBody.usesPreciseCollisionDetection = YES;

    [self runAction:[SKAction playSoundFileNamed:@"arrow.wav" waitForCompletion:NO]];

    CGPoint offset = rwSub(location, projectile.position);


    if (offset.x <= 0) return;

    [self addChild:projectile];

    CGPoint direction = rwNormalize(offset);

    CGPoint shootAmount = rwMult(direction, 1000);

    CGPoint realDest = rwAdd(shootAmount, projectile.position);

    float angle = atan2f (location.y - projectile.position.y, location.x - projectile.position.x) ;

    float velocity = 500.0/1.0;
    float realMoveDuration = self.size.width / velocity;
    SKAction * actionangle = [SKAction rotateByAngle:angle duration:0.0];
    SKAction * actionMove = [SKAction moveTo:realDest duration:realMoveDuration];
    SKAction * actionMoveDone = [SKAction removeFromParent];
    [projectile runAction:[SKAction sequence:@[actionangle,actionMove,actionMoveDone]]]; 

我不知道如何解决这个问题。谁知道请帮我解决这个问题。

Answer 1

如果你改变这个会发生什么:

 projectile.physicsBody.collisionBitMask = projectileCategory | monsterCategory;

到

 projectile.physicsBody.collisionBitMask = monsterCategory;