超出屏幕范围时如何正确删除节点? [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，其中节点在屏幕最低点下方生成，并且重力设置为让它们浮动到屏幕顶部.一切都很完美，但它很快开始减慢 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它们超过一个点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 方法下方生成上述气泡的方式:

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],
                                         ]]];

}

我怎样才能使节点在离开屏幕时得到妥善处理?以及如何将 FPS 保持在 60 FPS 的恒定速率?

提前致谢！！

推荐答案

我会推荐使用 spritekit 中内置的接触检测.创建一个模仿屋顶的 skspritenode，该屋顶具有设置为检测与气泡接触的物理主体.在屋顶节点和气泡节点之间创建一个接触事件，该事件将简单地移除气泡.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.

联系人调用事件示例:

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

接触检测示例:

- (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];
}}

泡泡需求:

 _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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