351      技術社區[雲棲]

Cocos2dx 3.0 過渡篇（十）資源加載進度條Loading...

尊重原創，轉載請注明來自：star特530的CSDN博客 https://blog.csdn.net/start530/article/details/19420317

本來這篇博文是昨晚就要寫的，可是因為今早要去參加考駕照相關的體檢，而我最害怕的就是視力沒能達到5.0，畢竟這階段對著屏幕的時間過久。

首先看下頭文件：HelloWorld.h

[cpp] view plaincopy

1. #ifndef __HELLOWORLD_SCENE_H__  
2. #define __HELLOWORLD_SCENE_H__  
3.   
4. #include "cocos2d.h"  
5.   
6. class HelloWorld : public cocos2d::Layer  
7. {  
8. public:  
9.     HelloWorld():m_numSp(20),m_loadedSp(0),loadProgress(NULL){};  
10.   
11.     static cocos2d::Scene* createScene();  
12.     virtual bool init();    
13.   
14.     void loadingCallback(Object* pSender);//加載一張圖片完成後跳轉的毀掉函數  
15.   
16.     void gotoNewLayer();//加載完後的跳轉函數  
17.     CREATE_FUNC(HelloWorld);  
18.   
19. private:  
20.     cocos2d::ProgressTimer* loadProgress;//進度條  
21.   
22.     cocos2d::LabelTTF* percentLabel;//加載進度label  
23.     cocos2d::LabelTTF* loadLabel;//顯示 loading: 的label  
24.   
25.     int m_numSp;//要加載的精靈數目,初始化為 20 張  
26.     int m_loadedSp;//已加載的精靈數目  
27. };  
28.   
29. #endif // __HELLOWORLD_SCENE_H__  

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1. Size visibleSize = Director::getInstance()->getVisibleSize();  
2. Point origin = Director::getInstance()->getVisibleOrigin();  
3.   
4. loadLabel = LabelTTF::create("Loading:","Arial",20);//創建顯示Loading: 的label  
5. loadLabel->setPosition(Point(visibleSize.width/2-30,visibleSize.height/2+30));  
6. this->addChild(loadLabel,1);  
7.   
8. percentLabel = LabelTTF::create("0%","Arial",20);//創建顯示百分比的label  
9. percentLabel->setPosition(Point(visibleSize.width/2+35,visibleSize.height/2+30));  
10. this->addChild(percentLabel,2);  
11.   
12. auto loadBg = Sprite::create("sliderTrack.png");//進程條的底圖  
13. loadBg->setPosition(Point(visibleSize.width/2,visibleSize.height/2));  
14. this->addChild(loadBg,1);  
15.   
16. loadProgress = ProgressTimer::create(Sprite::create("sliderProgress.png"));//創建一個進程條  
17. loadProgress->setBarChangeRate(Point(1,0));//設置進程條的變化速率  
18. loadProgress->setType(ProgressTimer::Type::BAR);//設置進程條的類型  
19. loadProgress->setMidpoint(Point(0,1));//設置進度的運動方向  
20. loadProgress->setPosition(Point(visibleSize.width/2,visibleSize.height/2));  
21. loadProgress->setPercentage(0.0f);//設置初始值為0  
22. this->addChild(loadProgress,2);  

[cpp] view plaincopy

1. //加載20張圖片，每加載完一張就調用回調函數:loadingCallback  
2. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
3. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld1.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
4. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld2.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
5. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld3.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
6. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld4.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
7. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld5.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
8. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld6.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
9. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld7.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
10. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
11. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
12.   
13. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
14. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
15. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
16. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
17. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
18. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
19. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
20. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
21. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  
22. Director::getInstance()->getTextureCache()->addImageAsync("HelloWorld.png",this,callfuncO_selector(HelloWorld::loadingCallback));  

[cpp] view plaincopy

1. void HelloWorld::loadingCallback(Object* pSender)  
2. {  
3.     ++m_loadedSp;//每進到這個函數一次，讓m_loadedSp + 1  
4.   
5.     char buf_str[16];  
6.     sprintf(buf_str,"%d%%",(int)(((float)m_loadedSp / m_numSp) * 100),m_numSp);  
7.     percentLabel->setString(buf_str);//更新percentLabel的值  
8.   
9.     float newPercent = 100 - ((float)m_numSp - (float)m_loadedSp)/((float)m_numSp/100);//計算進度條當前的百分比  
10.     //因為加載圖片速度很快，所以就沒有使用ProgressTo，  
11.     //或者ProgressFromTo這種動作來更新進度條  
12.     loadProgress->setPercentage(newPercent);//更新進度條  
13.   
14.     //圖片加載完成後  
15.     if(m_loadedSp == m_numSp)  
16.     {  
17.         this->removeChild(loadProgress);//將添加的幾個對象刪除掉  
18.         this->removeChild(percentLabel);  
19.         this->removeChild(loadLabel);  
20.   
21.         //加載完既要跳轉到gotoNewLayer,在這裏可以  
22.         //創建新的Scene，新的Layer，或者其他什麼亂七八糟的  
23.         this->gotoNewLayer();  
24.     }  
25. }  

[cpp] view plaincopy

1. void HelloWorld::gotoNewLayer()  
2. {  
3.     auto size = Director::getInstance()->getWinSize();  
4.   
5.     auto sp = Sprite::create("HelloWorld.png");//用之前加載到緩存中的圖片，創建一個精靈。  
6.     sp->setPosition(Point(size.width/2,size.height/2));  
7.     this->addChild(sp,1);  
8. }  

最後更新：2017-04-03 12:56:12

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