在CCTouchesMoved中使用Cocos2D粒子效果时FPS降低问题

Question

这是我在CCTouchesMoved中用于在触摸位置产生粒子效果的代码。但是在使用这种FPS的同时，触摸正在向下移动到20！我已经尝试降低粒子的寿命和持续时间（你可以在代码中看到）.....

如何解决FPS降低触摸问题，同时使用粒子效应？

- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 
    location = [touch locationInView:[touch view]]; 
    location = [[CCDirector sharedDirector] convertToGL:location]; 

    swipeEffect = [CCParticleSystemQuad particleWithFile:@"comet.plist"]; 

    //Setting some parameters for the effect 
    swipeEffect.position = ccp(location.x, location.y); 

    //For fixing the FPS issue I deliberately lowered the life & duration 
    swipeEffect.life =0.0000000001; 
    swipeEffect.duration = 0.0000000001; 

    //Adding and removing after effects 
    [self addChild:swipeEffect]; 
    swipeEffect.autoRemoveOnFinish=YES; 
} 

请帮我...我试着用不同的颗粒&最大限度地减少生命和持续时间，但没有工作！ 任何新的想法？或修复我所做的事情？

Answer 1

我高度怀疑减速的原因是因为每次触摸移动时都会实例化一个新的CCParticleSystemQuad。为什么不只是初始化它曾经在init或ccTouchesBegan方法，但只设置在ccTouchesMoved位置和emissionRate：

- (id)init { 
    ... 

    swipeEffect = [CCParticleSystemQuad particleWithFile:@"comet.plist"]; 
    swipeEffect.emissionRate = 0; 
    [self addChild:swipeEffect]; 

    ... 
} 

- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
    swipeEffect.emissionRate = 10; 
} 

- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 
    UITouch *touch = [touches anyObject]; 
    CGPoint location = [touch locationInView:[touch view]]; 
    location = [[CCDirector sharedDirector] convertToGL:location]; 
    swipeEffect.position = location; 
} 

- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 
    swipeEffect.emissionRate = 0; 
}