xcode 如何让 cocos2d 精灵每秒向上和向下缩放（以获得脉动效果）？
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原文地址: http://stackoverflow.com/questions/3185186/
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How to make cocos2d sprite scale up and down (for a pulsating effect) every second?
提问by RexOnRoids
I want to have a sprite scale up and down once every second to make it seem like it is bulging and pulsating. How can I do this?
我想每秒向上和向下缩放一次精灵，以使其看起来像是膨胀和脉动。我怎样才能做到这一点？
回答by ZenQW
As the post before contains syntax errors. To be more precise, I post working code:
由于之前的帖子包含语法错误。更准确地说，我发布了工作代码：
CCSprite * sprite = ...; // create the sprite.
id scaleUpAction = [CCEaseInOut actionWithAction:[CCScaleTo actionWithDuration:1 scaleX:1.0 scaleY:1.0] rate:2.0];
id scaleDownAction = [CCEaseInOut actionWithAction:[CCScaleTo actionWithDuration:0.5 scaleX:0.8 scaleY:0.8] rate:2.0];
CCSequence *scaleSeq = [CCSequence actions:scaleUpAction, scaleDownAction, nil];
[sprite runAction:[CCRepeatForever actionWithAction:scaleSeq]];
回答by hhamm
You could use a simple [CCScaleTo ..] action or if you want to create your own "effect" you could advance the CCFiniteTimeAction. I would prefer the first one :
您可以使用简单的 [CCScaleTo ..] 操作，或者如果您想创建自己的“效果”，您可以推进 CCFiniteTimeAction。我更喜欢第一个：
CCSprite * sprite = ...; // create the sprite.
sprite.anchorPoint = ccp( 0.5, 0.5 ); center the pivot
id myAction = [CCRepeatForEver actionWithActions:[CCScaleTo actionWithDuration:0.5 scaleX:2.0 ScaleY:2.0],[CCScaleTo actionWithDuration:0.5 scaleX:0.5 ScaleY:0.5], nil];
[sprite runAction:myAction];
use CCEase to make the animation nonlinear
使用 CCEase 使动画非线性
id myAction = [CCRepeatForEver actionWithActions:[CCEaseInOut actionWithAction:[CCScaleTo actionWithDuration:0.5 scaleX:2.0 ScaleY:2.0] rate:2.0],[CCEaseInOut actionWithAction:[CCScaleTo actionWithDuration:0.5 scaleX:0.5 ScaleY:0.5] rate:2.0], nil];
this post may contain errors. but I hope you understand the way to come to the goal.
这篇文章可能包含错误。但我希望你了解达到目标的方法。
