cocos2d学习笔记 CCMenu与CocosDenshion

一、CCMenu

游戏中的菜单必不可少，CCMenu正是你想要的。

要创建CCMenu，你必须有CCMenuItem对象，CCMenuItem便是你菜单中的某个选项，可以为图片、文字等

cocos2d为menu item提供了必要的转换方法，比如CCMenuItemLabel你可以通过CCLabelBMFont得到；游戏中某些开关，比如声音开关可以用CCMenuItemToggle对象

每一个CCMenuItem都可以在创建的时候绑定某个对象的方法，当这个CCMenuItem被点击的时候会触发这个方法

二、CocosDenshion

cocos2d中集成了CocosDenshion，不过游戏中我们一般都是整个背景音乐或者来点音效，所以我们只需要用SimpleAudioEngine就可以了。

SimpleAudioEngine其实是对CDAudioManager进行了一些封装，我们暂时不去关注细节实现，先看看怎么使用

这是一段通用的代码，用来确保建立SimpleAudioEngine对象成功

[cpp] view plain copy

// Indicate that we are trying to start up the Audio Manager
[CDSoundEngine setMixerSampleRate:CD_SAMPLE_RATE_MID];
//Init audio manager asynchronously as it can take a few seconds
//The FXPlusMusicIfNoOtherAudio mode will check if the user is
// playing music and disable background music playback if
// that is the case.
[CDAudioManager initAsynchronously:kAMM_FxPlusMusicIfNoOtherAudio];
//Wait for the audio manager to initialise
while ([CDAudioManager sharedManagerState] != kAMStateInitialised)
{
[NSThread sleepForTimeInterval:0.1];
}
//At this point the CocosDenshion should be initialized
// Grab the CDAudioManager and check the state
CDAudioManager *audioManager = [CDAudioManager sharedManager];
if (audioManager.soundEngine == nil ||
audioManager.soundEngine.functioning == NO) {
CCLOG(@"CocosDenshion failed to init, no audio will play.");
managerSoundState = kAudioManagerFailed;
} else {
[audioManager setResignBehavior:kAMRBStopPlay autoHandle:YES];
soundEngine = [SimpleAudioEngine sharedEngine];
managerSoundState = kAudioManagerReady;
CCLOG(@"CocosDenshion is Ready");
}

当对象成功创建以后，便可以使用这个对象了，预加载的过程会hang住程序，所以不要在主线程中进行声音的预加载

[soundEngine preloadBackgroundMusic:trackFileName];

[soundEngine playBackgroundMusic:trackFileNameloop:YES];

[cpp] view plain copy

[CDSoundEngine setMixerSampleRate:CD_SAMPLE_RATE_MID];

设置采样率，可以在CocosDenshion.h中看到各种采样率的宏定义，可以根据自己的声音文件来设置，注意：当你声音文件低于设置的采样率时，会使用设置的采样率而产生内存的浪费。

[cpp] view plain copy

[CDAudioManager initAsynchronously:kAMM_FxPlusMusicIfNoOtherAudio];

共有这几种模式：

kAMM_FxOnly,//!Other apps will be able to play audio

kAMM_FxPlusMusic,//!Only this app will play audio

kAMM_FxPlusMusicIfNoOtherAudio,//!If another app is playing audio at start up then allow it to continue and don't play music

kAMM_MediaPlayback,//!This app takes over audio e.g music player app

kAMM_PlayAndRecord//!App takes over audio and has input and output

都很好懂，就不一一翻译了

1     // 预先加载背景音乐 - init
2     CocosDenshion::SimpleAudioEngine::sharedEngine()->preloadBackgroundMusic("audio_game_back.mp3");
3     // 播放背景音乐 - init
4     CocosDenshion::SimpleAudioEngine::sharedEngine()->playBackgroundMusic("audio_game_back.mp3", true);
5     // 预先加载音效 - init
6     CocosDenshion::SimpleAudioEngine::sharedEngine()->preloadEffect("audio_card_click.mp3");、
7     // 播放音效 - touch
8     CocosDenshion::SimpleAudioEngine::sharedEngine()->playEffect("audio_card_click.mp3");

cocosDenshion是cocos2d的音频引擎。对cocos2d工程提供了很方便的声音素材的调用和管理。在0.99.4版本中有了很多相关的扩展。下面对0.99.4版简要说说几个常见的应用。
1. preload:
SimpleAudioEngine *sae = [SimpleAudioEngine sharedEngine];  //定义SimpleAudioEngine的单件实例
[sae preloadEffect:@"dp1.caf"];    //preload的作用在于不需要在使用音频文件时才去内存中读取素材，从而降低卡机的可能性
[sae preloadBackgroundMusic:@"bgm.mp3"];    //背景音乐：与Effect的区别在于可以循环播放

sound1 = [[sae soundSourceForFile:@"dp1.caf"] retain];    //在使用音频时进行retain在增加对文件的引用。

sound3.gain = 0.0f;    //音频增益，1.0f是最大
CDSoundSourceFader *sourceFader = [[CDSoundSourceFader alloc] init:sound1 interpolationType:kIT_SCurve startVal:1.0f endVal:0.0f];    //定义音量的渐变：interpolationType是变化的类型，可以是线性，曲线，指数型

[sourceFader setStopTargetWhenComplete:YES];   //？
CDXPropertyModifierAction *faderAction = [CDXPropertyModifierAction actionWithDuration:1.0f modifier:sourceFader];    //将音量渐变作为声音的Modifier
[faderAction retain];

[[SimpleAudioEnginesharedEngine] isBackgroundMusicPlaying] //是否再播放背景音乐

[[SimpleAudioEnginesharedEngine] preloadBackgroundMusic:file_name];//预加载

[[SimpleAudioEnginesharedEngine] playBackgroundMusic:file_name];//播放背景音乐

[[SimpleAudioEnginesharedEngine] pauseBackgroundMusic];//暂停背景音乐

[[SimpleAudioEnginesharedEngine] stopBackgroundMusic];//停止播放背景音乐

[[SimpleAudioEnginesharedEngine] resumeBackgroundMusic];

CocosDenshion下载:http://download.csdn.net/detail/daiyelang/6628605

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cocos2d学习笔记 CCMenu与CocosDenshion

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