Question

我正在使用SpriteKit在Xcode中制作游戏，我在处理粒子时遇到了问题。

初始化SKEmitterNode的方法：

-(SKEmitterNode *)newExplosionEmitter {
NSString *explosionPath = [[NSBundle mainBundle] pathForResource:@"explosionH" ofType:@"sks"];
SKEmitterNode *explosion = [NSKeyedUnarchiver unarchiveObjectWithFile:explosionPath];
return explosion;

}

我的这个方法是CPU1的AI，在更新方法中调用。

-(void)CPU1AI {
SKSpriteNode *CPU1 = (SKSpriteNode *)[self childNodeWithName:CPU1CategoryName];

int aiX = CPU1.position.x;
int aiY = CPU1.position.y;
int ballX = self.ball.position.x;
int ballY = self.ball.position.y;

if ((aiY-ballY)<250 && !CPU1isDead) {
    //CPU1 AI

}
if (CPU1isDead) {
    float posY = CPU1.position.y;
    float centerX = self.frame.size.width/2;
    CGPoint goToPos = CGPointMake(centerX, posY);

    SKAction *moveToPoint = [SKAction moveTo:goToPos duration:3];
    SKAction *removeNode = [SKAction removeFromParent];
    SKAction *CPUdead = [SKAction runBlock:^{CPU1isDead = NO;}];
    SKAction *sequence = [SKAction sequence:@[moveToPoint, removeNode, CPUdead]];
    explosion.position = CPU1.position;
    explosion.zPosition = 10;
    [CPU1 runAction:sequence];
    if (![explosion hasActions]) {
        explosion = [self newExplosionEmitter];
        [self addChild:explosion];
        [explosion runAction:[SKAction sequence:@[[SKAction fadeAlphaTo:0.5 duration:3.5],[SKAction removeFromParent]]]];
    }
}
[explosion removeAllChildren];
}

在SK runActions结束后，我把“[explosion removeAllChildren]”只是为了确保我的粒子将被移除，但是有或没有它，一个仍然留在内存中（我猜）并且仍然在缓冲。是因为我在场景中将其声明为静态SKEmitterNode吗？

提前致谢！

Answer 1

将这些方法添加到您的SKScene子类中（我稍微修改过的Apple网站上的代码）......

- (SKEmitterNode*) newExplosionNode: (CFTimeInterval) explosionDuration
{
    SKEmitterNode *emitter =  [NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:@"explosionH" ofType:@"sks"]];

    // Explosions always place their particles into the scene.
    emitter.targetNode = self;

    // Stop spawning particles after enough have been spawned.
    emitter.numParticlesToEmit = explosionDuration * emitter.particleBirthRate;

    // Calculate a time value that allows all the spawned particles to die. After this, the emitter node can be removed.

    CFTimeInterval totalTime = explosionDuration + emitter.particleLifetime+emitter.particleLifetimeRange/2;
    [emitter runAction:[SKAction sequence:@[[SKAction fadeAlphaTo:0.5 duration:totalTime],
                                            [SKAction removeFromParent]]]];
    return emitter;
}

- (void)createExplosionAtPosition:(CGPoint)position
{
    SKEmitterNode *explosion = [self newExplosionNode:3.5];
    explosion.position = position;
    explosion.zPosition = 10;
    [self addChild:explosion];
}

从代码中删除以下内容...

explosion.position = CPU1.position;
explosion.zPosition = 10;
[CPU1 runAction:sequence];
if (![explosion hasActions]) {
    explosion = [self newExplosionEmitter];
    [self addChild:explosion];
    [explosion runAction:[SKAction sequence:@[[SKAction fadeAlphaTo:0.5 duration:3.5],[SKAction removeFromParent]]]];
}

并将其替换为

[self createExplosionAtPosition:CPU1.position];

我怀疑你想在if语句中设置CPU1isDead = NO，所以代码不会多次执行。您还应该删除[explosion removeAllChildren]。

Answer 2

只是为了帮助别人寻找相同的答案我试过这个上面的那个也不适合我 - 但让我走上正轨。

-(void)addTimeBonusParticles
{
    SKAction *remove = [SKAction performSelector:@selector(StopParticlesFlame) onTarget:self];
    SKAction *wait = [SKAction waitForDuration: .5];
    SKAction* blockAction = [SKAction runBlock:^

                             {

                                 NSString *file = [[NSBundle mainBundle] pathForResource:@"TimeBonusMagic" ofType:@"sks"];
                                 stars = [NSKeyedUnarchiver unarchiveObjectWithFile:file];
                                 [self addChild:stars];
                                 stars.zPosition = 5;
                                 stars.position = CGPointMake(countDown.position.x, countDown.position.y);


                             }];

    [self runAction:[SKAction sequence:@[blockAction,wait,remove]]];
}

Objective-c，动作完成后未删除SpriteKit粒子

2 个答案: