cocos2d-x 关于home键黑屏和游戏loading界面

转自：http://blog.csdn.net/qq634416025/article/details/8041363

有时候场景中的资源加载过多的话就会引起游戏进入的时候很卡，因为那是边加载边显示。还有在游戏中按下home键 再进入游戏的时候会有一段时间的黑屏，那是因为游戏要重新加载资源，这样用户体验非常不好。

我在tests例子里面发现一个很好的例子叫做TextureCacheTest，里面讲解了如何写loading。

首先在类头文件里面写上：

[cpp] view plaincopy

1. //loading......callback
2. void loadingCallBack(cocos2d::CCObject *obj);
3. void addSprite();
5. cocos2d::CCLabelTTF *m_pLabelLoading;
6. cocos2d::CCLabelTTF *m_pLabelPercent;
7. int m_nNumberOfSprites;//计数用 在构造函数中初始化成要加载的资源个数
8. int m_nNumberOfLoadedSprites;//初始化为0

[cpp] view plaincopy

1. //loading......callback  
2. void loadingCallBack(cocos2d::CCObject *obj);  
3. void addSprite();  
4.   
5. cocos2d::CCLabelTTF *m_pLabelLoading;  
6. cocos2d::CCLabelTTF *m_pLabelPercent;  
7. int m_nNumberOfSprites;//计数用 在构造函数中初始化成要加载的资源个数  
8. int m_nNumberOfLoadedSprites;//初始化为0  

然后在cpp里面实现：这是我随便截取的代码

[cpp] view plaincopy

1. CCSize size = CCDirector::sharedDirector()->getWinSize();
2. //////////////////////////////////////////////////////////////////////////
3. //loading界面
4. m_pLabelLoading = CCLabelTTF::create("loading...", "Arial", 15);
5. m_pLabelPercent = CCLabelTTF::create("%0", "Arial", 15);
7. m_pLabelLoading->setPosition(CCPointMake(size.width / 2, size.height / 2 - 20));
8. m_pLabelPercent->setPosition(CCPointMake(size.width / 2, size.height / 2 + 20));
10. this->addChild(m_pLabelLoading,10);
11. this->addChild(m_pLabelPercent,10);
12. //////////////////////////////////////////////////////////////////////////
13. CCTextureCache::sharedTextureCache()->addImageAsync("gobacknormal.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
14. CCTextureCache::sharedTextureCache()->addImageAsync("gobackselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
15. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/achievementnormal.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
16. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/achievementselected.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
17. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle1normal.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
18. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2normal.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
19. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3normal.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
20. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle1selected.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
21. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2selected.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
22. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3selected.png",this, callfuncO_selector(BighurdleLayer::loadingCallBack));
23. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle1lock.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
24. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2lock.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
25. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3lock.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
26. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2lockselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
27. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3lockselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
28. CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/main.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));
29. CCTextureCache::sharedTextureCache()->addImageAsync("Smallhurdle/starfull.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));

[cpp] view plaincopy

1. CCSize size = CCDirector::sharedDirector()->getWinSize();  
2. //////////////////////////////////////////////////////////////////////////  
3.     //loading界面  
4.     m_pLabelLoading = CCLabelTTF::create("loading...", "Arial", 15);  
5.     m_pLabelPercent = CCLabelTTF::create("%0", "Arial", 15);  
6.   
7.     m_pLabelLoading->setPosition(CCPointMake(size.width / 2, size.height / 2 - 20));  
8.     m_pLabelPercent->setPosition(CCPointMake(size.width / 2, size.height / 2 + 20));  
9.   
10.     this->addChild(m_pLabelLoading,10);  
11.     this->addChild(m_pLabelPercent,10);  
12. //////////////////////////////////////////////////////////////////////////  
13.     CCTextureCache::sharedTextureCache()->addImageAsync("gobacknormal.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
14.     CCTextureCache::sharedTextureCache()->addImageAsync("gobackselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
15.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/achievementnormal.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
16.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/achievementselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
17.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle1normal.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
18.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2normal.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
19.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3normal.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
20.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle1selected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
21.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2selected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
22.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3selected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
23.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle1lock.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
24.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2lock.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
25.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3lock.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
26.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle2lockselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
27.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/Bighurdle3lockselected.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
28.     CCTextureCache::sharedTextureCache()->addImageAsync("Bighurdle/main.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  
29.     CCTextureCache::sharedTextureCache()->addImageAsync("Smallhurdle/starfull.png", this, callfuncO_selector(BighurdleLayer::loadingCallBack));  

然后在回调函数

[cpp] view plaincopy

1. void BighurdleLayer::loadingCallBack(cocos2d::CCObject *obj)
2. {
3. ++m_nNumberOfLoadedSprites;
4. char tmp[10];
5. sprintf(tmp,"%%%d", (int)(((float)m_nNumberOfLoadedSprites / m_nNumberOfSprites) * 100));
6. m_pLabelPercent->setString(tmp);
8. if (m_nNumberOfLoadedSprites == m_nNumberOfSprites)
9. {
10. this->removeChild(m_pLabelLoading, true);
11. this->removeChild(m_pLabelPercent, true);
12. addSprite();//这里是自己写得添加精灵的函数
13. }
14. }

[cpp] view plaincopy

1. void BighurdleLayer::loadingCallBack(cocos2d::CCObject *obj)  
2. {  
3.     ++m_nNumberOfLoadedSprites;  
4.     char tmp[10];  
5.     sprintf(tmp,"%%%d", (int)(((float)m_nNumberOfLoadedSprites / m_nNumberOfSprites) * 100));  
6.     m_pLabelPercent->setString(tmp);  
7.   
8.     if (m_nNumberOfLoadedSprites == m_nNumberOfSprites)  
9.     {  
10.         this->removeChild(m_pLabelLoading, true);  
11.         this->removeChild(m_pLabelPercent, true);  
12.         addSprite();//这里是自己写得添加精灵的函数  
13.     }  
14. }  

如果有更好的方法，请告知我，谢谢 共同进步

二.当按home键到桌面去，然后回到游戏弹出个进度条 然后游戏开始

我们只需要在AppDelegate.cpp里面添加layer就可以了 然后layer里面弄上定时器 一段时间后自动取消

[cpp] view plaincopy

1. // this function will be called when the app is active again
2. void AppDelegate::applicationWillEnterForeground()
3. {
4. CCSize winSize = CCDirector::sharedDirector()->getWinSize();
5. Loading *loading = new Loading();
6. //CCSprite *sp = CCSprite::create("HelloWorld.png");
7. //sp->setPosition(ccp(winSize.width/2, winSize.height/2));
8. //loading->addChild(sp);
9. CCDirector::sharedDirector()->getRunningScene()->addChild((CCNode *)loading);

[cpp] view plaincopy

1. // this function will be called when the app is active again  
2. void AppDelegate::applicationWillEnterForeground()  
3. {  
4.     CCSize winSize = CCDirector::sharedDirector()->getWinSize();  
5.     Loading *loading = new Loading();  
6.     //CCSprite *sp = CCSprite::create("HelloWorld.png");  
7.     //sp->setPosition(ccp(winSize.width/2, winSize.height/2));  
8.     //loading->addChild(sp);  
9.     CCDirector::sharedDirector()->getRunningScene()->addChild((CCNode *)loading);