【iOS-Cocos2d游戏开发之二十二 】CCSpeed实现CCAnimate动画进行时设置慢动作以及设置游戏加减速进行(塔防游戏必备)！ .

Himi
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原文地址：/article/1362545.html

最近也一直在忙，所以也只能每周的某一天抽出时间来分享一些知识点给童鞋们，希望童鞋们体谅下～

那么废话不多说了，本篇知识点两个：

1.利用CCSpeed当精灵执行CCAnimate动作途中设置其播放的速度；

2.设置游戏的速率，让你自由设置整个游戏的速度；

首先介绍第一个知识点：

对于第一个知识点，精灵执行CCAnimate动作途中设置播放速度，说白一点就是当主角或者怪物播放一套帧动作（动画）的时候，可能突然受到其他因素影响希望主角或者怪物等动作放慢，也就是慢动作的感觉，那么这时候我们就需要设置动作的播放速度拉，也就是今天要介绍的CCSpeed这个类；可能Himi这里哇哇哇的说这么多还是没亭台明白吧...=。 = 那么下面我们来看看代码等就应该明白了；

至于精灵如何利用CCAnimate实现帧集合动画教程在之前已经讲述过，那么这里就不在赘述，如果还不清楚如何利用很多帧形成动画让精灵播放的童鞋请移步到：【iOS-Cocos2d游戏开发之二十一 】自定义精灵类并为你的精灵设置攻击帧(指定开始帧)以及扩展Cocos2d源码的CCAnimation简化动画创建！

直接上一段代码如下：

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[[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"animationsFrames.plist"];

CCSprite*mySprite=[CCSprite spriteWithSpriteFrameName:@"himi1.png"];
mySprite.position=ccp(120,150);
[self addChild:mySprite];
CCAnimation*anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1];
CCAnimate* animate = [CCAnimate actionWithAnimation:anim];
CCSequence *seq = [CCSequence actions:animate,nil];
CCRepeatForever* repeat = [CCRepeatForever actionWithAction:seq];
[mySprite runAction:repeat];

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[[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"animationsFrames.plist"];  

//左侧正常速度的播放   
CCSprite*mySprite=[CCSprite spriteWithSpriteFrameName:@"himi1.png"];  

mySprite.position=ccp(120,150);  

[self addChild:mySprite];    
CCAnimation*anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1];   

CCAnimate* animate = [CCAnimate actionWithAnimation:anim];  

CCSequence *seq = [CCSequence actions:animate,nil];   

//让你的永久动作放入speed中   
CCSpeed *speed =[CCSpeed actionWithAction:[CCRepeatForever actionWithAction:seq] speed:1.0f];  

[speed setTag:888];//设置tag能任意获取到其实例，并且对其进行操作   
[mySprite runAction:speed];  

        [[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"animationsFrames.plist"];
        //左侧正常速度的播放
        CCSprite*mySprite=[CCSprite spriteWithSpriteFrameName:@"himi1.png"];
        mySprite.position=ccp(120,150);
        [self addChild:mySprite]; 
        CCAnimation*anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1]; 
        CCAnimate* animate = [CCAnimate actionWithAnimation:anim];
        CCSequence *seq = [CCSequence actions:animate,nil]; 
        //让你的永久动作放入speed中
        CCSpeed *speed =[CCSpeed actionWithAction:[CCRepeatForever actionWithAction:seq] speed:1.0f];
        [speed setTag:888];//设置tag能任意获取到其实例，并且对其进行操作
        [mySprite runAction:speed];

这段代码和第一段代码不同点就是第二段将CCRepeatForever永久动作又包装到了CCSpeed中，整个动作等同与交给了CCSpeed来控制了，那么下面我还设置了[speed setTag:888];这个是留出接口，当你需要设置整个CCSpeed包装的动作速度的时候利用tag获取到，这个大家肯定很熟悉，那么获取动作方式如下：

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CCSpeed *speed=(CCSpeed*)[sprite getActionByTag:88];

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CCSprite *mySpriteByF =[CCSprite spriteWithSpriteFrameName:@"himi1.png"];  

mySpriteByF.position=ccp(360,150);  

[self addChild:mySpriteByF z:0 tag:66];    
anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1];   

animate = [CCAnimate actionWithAnimation:anim];    

seq =[CCSequence actions:animate, nil];  

CCSpeed *speed =[CCSpeed actionWithAction:[CCRepeatForever actionWithAction:seq] speed:1.0f];   

[speed setTag:88];   
[mySpriteByF runAction:speed];   
[self schedule:@selector(slowForHimi) interval:5];  

        CCSprite *mySpriteByF =[CCSprite spriteWithSpriteFrameName:@"himi1.png"];
        mySpriteByF.position=ccp(360,150);
        [self addChild:mySpriteByF z:0 tag:66]; 
        anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1]; 
        animate = [CCAnimate actionWithAnimation:anim];  
        seq =[CCSequence actions:animate, nil];
        CCSpeed *speed =[CCSpeed actionWithAction:[CCRepeatForever actionWithAction:seq] speed:1.0f]; 
        [speed setTag:88];
        [mySpriteByF runAction:speed];
        [self schedule:@selector(slowForHimi) interval:5];

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-(void)slowForHimi{
[self unschedule:@selector(slowForHimi)];//解除此选择器
CCSprite*sprite=(CCSprite*)[self getChildByTag:66];

CCSpeed *speed=(CCSpeed*)[sprite getActionByTag:88];

[speed setSpeed:0.5];//放慢原有速度的0.5倍
}

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[CCSpeed* setSpeed:XX];  

[CCSpeed* setSpeed:XX];

这里的XX参数指的是倍率，传入1表示原速，大于1表示增快，小于1表示放慢速度～

下面直接给出全部测试项目代码：

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//
// HelloWorldLayer.m
// SLowAnimationByHimi
//
// Created by 华明 李 on 11-11-21.
// Copyright Himi 2011年. All rights reserved.
//


// Import the interfaces
#import "HelloWorldLayer.h"
#import "CCAnimationHelper.h"
// HelloWorldLayer implementation
@implementation HelloWorldLayer

+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];


// 'layer' is an autorelease object.
HelloWorldLayer *layer = [HelloWorldLayer node];


// add layer as a child to scene
[scene addChild: layer];

// return the scene
return scene;
}
//CCJumpTo实现，抛物线
//
// on "init" you need to initialize your instance
-(id) init{

if( (self=[super init])) {

CCLabelTTF *label = [CCLabelTTF labelWithString:@"暂缓动作&设置整个游戏加速/减速" fontName:@"Marker Felt" fontSize:24];

label.position = ccp(260,260);

[self addChild: label z:0 ];
label = [CCLabelTTF labelWithString:@"正常速度的播放" fontName:@"Marker Felt" fontSize:12];

label.position = ccp(120,220);

[self addChild: label z:0 tag:99];
label = [CCLabelTTF labelWithString:@"左侧动态放慢的速度的动作" fontName:@"Marker Felt" fontSize:12];

label.position = ccp(350,220);

[self addChild: label z:0 ];


[[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"animationsFrames.plist"];

//左侧正常速度的播放
CCSprite*mySprite=[CCSprite spriteWithSpriteFrameName:@"himi1.png"];

mySprite.position=ccp(120,150);

[self addChild:mySprite];
CCAnimation*anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1];

CCAnimate* animate = [CCAnimate actionWithAnimation:anim];

CCSequence *seq = [CCSequence actions:animate,nil];

CCRepeatForever* repeat = [CCRepeatForever actionWithAction:seq];

[mySprite runAction:repeat];



//左侧动态放慢的速度的动作
CCSprite *mySpriteByF =[CCSprite spriteWithSpriteFrameName:@"himi1.png"];

mySpriteByF.position=ccp(360,150);

[self addChild:mySpriteByF z:0 tag:66];
anim=[CCAnimation animationWithFrame:@"himi" frameCount:12 delay:0.1];

animate = [CCAnimate actionWithAnimation:anim];

seq =[CCSequence actions:animate, nil];

CCSpeed *speed =[CCSpeed actionWithAction:[CCRepeatForever actionWithAction:seq] speed:1.0f];

[speed setTag:88];
[mySpriteByF runAction:speed];
[self schedule:@selector(slowForHimi) interval:5];
}
return self;
}

-(void)slowForHimi{
[self unschedule:@selector(slowForHimi)];//解除此选择器
CCSprite*sprite=(CCSprite*)[self getChildByTag:66];

CCSpeed *speed=(CCSpeed*)[sprite getActionByTag:88];

[speed setSpeed:0.5];//放慢原有速度的0.5倍
}


// on "dealloc" you need to release all your retained objects

- (void) dealloc
{
// in case you have something to dealloc, do it in this method

// in this particular example nothing needs to be released.

// cocos2d will automatically release all the children (Label)


// don't forget to call "super dealloc"
[super dealloc];
}
@end

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[[CCScheduler sharedScheduler] setTimeScale:XX];  

[[CCScheduler sharedScheduler] setTimeScale:XX];

这里的XX仍然是倍率：传入1表示原速，大于1表示增快，小于1表示放慢速度～

OK，本篇就到此～

源码下载地址：http://download.csdn.net/detail/xiaominghimi/3839063