如何在屏幕边界外正确删除节点？ [英] How to properly remove node when out of screen bounds?

问题描述

我正在开发一个sprite-kit游戏，其中节点在屏幕的最低点下方生成，重力设置为让它们浮动到屏幕顶部。一切都运作良好，但它很快就开始减慢FPS，最终滞后和故障变得非常缓慢。我认为解决这个问题的方法是在父节点超过一个点之后从父节点中删除节点，这是我在更新中使用的代码：

I'm working on a sprite-kit game where nodes spawn below the lowest point on the screen and gravity is set to have them float to the top of the screen. Everything works perfectly, but it quickly starts to slow down the FPS, and eventually lags and glitches becoming very slowly. I thought the way to solve this would have been to remove the nodes from the parent after they'd past a point, this was the code I used in the update:

-(void)update:(CFTimeInterval)currentTime {

    if (_bubble1.position.y > CGRectGetMaxX(self.frame)+40) {
        [self removeFromParent];
    }

}

如果需要，这就是我在 initWithSize 方法下产生泡泡的方法：

And in case it is needed, this is how I spawned said bubble below the initWithSize method:

-(void)didMoveToView:(SKView *)view {

    [self performSelector:@selector(spawnBubbles) withObject:nil afterDelay:1.0];
    [self performSelector:@selector(spawnBubbles1) withObject:nil afterDelay:1.5];

}

-(void)spawnBubbles {
    randomPosition = arc4random() %260*DoubleIfIpad;
    randomPosition = randomPosition + 20*DoubleIfIpad;

    randomNumber = arc4random() %7;
    randomNumber = randomNumber + 1;

    myColorArray = [[NSArray alloc] initWithObjects:colorCombo1, colorCombo2, colorCombo3, colorCombo4, colorCombo5, colorCombo6, colorCombo7, colorCombo8, nil];
    myRandomColor = [myColorArray objectAtIndex:randomNumber];

    _bubble1 = [SKShapeNode node];
    [_bubble1 setPath:CGPathCreateWithEllipseInRect(CGRectMake(-25*DoubleIfIpad, -25*DoubleIfIpad, 50*DoubleIfIpad, 50*DoubleIfIpad), nil)];
    _bubble1.strokeColor = _bubble1.fillColor = myRandomColor;
    _bubble1.position = CGPointMake(randomPosition, CGRectGetMinY(self.frame)-60);
    _bubble1.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:20];
    _bubble1.physicsBody.categoryBitMask = CollisionBubble;

    [self addChild:_bubble1];

    [self runAction:[SKAction sequence:@[
                                         [SKAction waitForDuration:1.0],
                                         [SKAction performSelector:@selector(spawnBubbles) onTarget:self],
                                         ]]];

}

我怎样才能这样做节点在离开屏幕时是否妥善处理？如何将FPS保持在60 FPS的恒定速率？

How can I make it so that the nodes are properly disposed of when they leave the screen? And how can I keep the FPS at a constant rate of 60 FPS?

提前致谢!!

推荐答案

我建议在spritekit中使用内置的接触检测。创建一个模仿屋顶的skspritenode，该屋顶的物理主体设置为检测与气泡的接触。在屋顶节点和气泡节点之间的接触上创建一个简单地去除气泡的事件。这将确保消除气泡并保持恒定的FPS。

I would recommend using the built in contact detection in spritekit. Create a skspritenode mimicking a roof that has a physics body set to detect contact with bubbles. Create an event on contact between the roof node and bubble node that will simply remove the bubbles. This will ensure that bubbles are removed and you maintain a constant FPS.

联系人呼叫事件示例：

- (void)bubble:(SKSpritenode*)bubble didCollideWithRoof:(SKSpriteNode*)roof{
[bubble removeFromParent];}

联络检测示例：

- (void)didBeginContact:(SKPhysicsContact *)contact
{
SKPhysicsBody *firstBody, *secondBody;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask)
{
    firstBody = contact.bodyA;
    secondBody = contact.bodyB;
}
else
{
    firstBody = contact.bodyB;
    secondBody = contact.bodyA;
}

if (firstBody.categoryBitMask==bubbleCategory && secondBody.categoryBitMask == roofCategory)
{
    [self bubble:(SKSpriteNode*)firstBody.node didCollideWithRoof:(SKSpriteNode*)secondBody.node];
}}

泡沫需求：

 _bubble.physicsBody.contactTestBitMask = roofCategory;

屋顶：

SKSpriteNode *roof = [SKSpriteNode spriteNodeWithColor:[SKColor blackColor] size:CGSizeMake(self.scene.size.width, 1)];   
roof.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(self.scene.size.width, 1)];

    roof.position = CGPointMake(self.scene.size.width/2,self.scene.size.height)
    roof.physicsBody.dynamic = NO;
    roof.physicsBody.categoryBitMask = floorCategory;
    roof.physicsBody.contactTestBitMask = bubbleCategory;
    [self addChild:roof];

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