游戏启动画面设计

效果：
1) 游戏主画面加在完毕
2) 进程图片渐现、渐隐(Ready, Set, Go!)
3) 进入游戏

思路：
通过图片加载生成CCSprite实例后构造包含多个Action的CCSequence：

• 图片渐显(CCFadeIn)
• 图片放大(CCScaleTo)
• 图片淡出(CCFadeOut)
• 执行回调(CCCallFuncN)【说实话，没太搞明白】

代码：

CCSprite * ready = [CCSprite spriteWithFile:@"ready.png"];
[self addChild:ready z:3];
[ready setPosition:ccp(240,160)];
[ready setOpacity:0];

CCSprite * set =[CCSprite spriteWithFile:@"set.png"];
[self addChild:set z:3];
[set setPosition:ccp(240,160)];
[set setOpacity:0];

CCSprite * go = [CCSprite spriteWithFile:@"go.png"];
[self addChild:go z:3];
[go setPosition:ccp(240,160)];
[go setOpacity:0];

[ready runAction:[CCSequence actions:[CCDelayTime actionWithDuration:0.5],[CCSpawn actions:[CCFadeIn actionWithDuration:0.4],[CCScaleTo actionWithDuration:0.4 scale:1.2],nil] ,[CCDelayTime actionWithDuration:0.2],[CCFadeOut actionWithDuration:0.4],[CCCallFuncN actionWithTarget:self selector:@selector(removeSprite:)],nil]];
[set runAction:[CCSequence actions:[CCDelayTime actionWithDuration:1.5],[CCSpawn actions:[CCFadeIn actionWithDuration:0.4],[CCScaleTo actionWithDuration:0.4 scale:1.2],nil] ,[CCDelayTime actionWithDuration:0.2],[CCFadeOut actionWithDuration:0.4],[CCCallFuncN actionWithTarget:self selector:@selector(removeSprite:)],nil]];
[go runAction:[CCSequence actions:[CCDelayTime actionWithDuration:2.5],[CCSpawn actions:[CCFadeIn actionWithDuration:0.4],[CCScaleTo actionWithDuration:0.4 scale:1.2],nil] ,[CCDelayTime actionWithDuration:0.2],[CCFadeOut actionWithDuration:0.4],[CCCallFuncN actionWithTarget:self selector:@selector(removeSpriteAndBegin:)],nil]];

代码下载：
http://bruce-lin-chn-sina-cn.iteye.com/blog/1124752