cocos2dx 加载进度条使用我们在游戏前通常都会加载好游戏中需要用到的资源，游戏的时候绘图才不会让内存飙升，不那么卡顿，
加载资源存到缓存时有一点点需要等待的时间，那么就设置一个场景显示一下进度条，加载完成就切换场景进入主游戏
进度条所在的头文件
class LoadingScene : public cocos2d::CCLayer { public: CREATE_FUNC(LoadingScene); bool init(); static cocos2d::CCScene* scene(); LoadingScene(); ~LoadingScene(); void resources(); //需要加载资源都放到这个函数里了 void loadCallBack(cocos2d::CCObject* object);//异步加载完成后回调主程序的函数 private: int count;//加载计数 int total;//总资源个数 cocos2d::CCLabelTTF* label;//显示加载进度文字 };
以下是实现#include "LoadingScene.h" #include "HelloWorldScene.h" USING_NS_CC; bool LoadingScene::init() { count = 0; total = 51; CCSize screen = CCDirector::sharedDirector()->getVisibleSize(); float width = screen.width; float height = screen.height; //进度条背景 CCSprite* loadBg = CCSprite::create("gmbg/lodingbg.png"); loadBg->setPosition(ccp(width / 2, height / 2)); this->addChild(loadBg); //进度条 CCSprite* loading = CCSprite::create("gmbg/longding.png"); CCProgressTimer* pt = CCProgressTimer::create(loading); pt->setMidpoint(ccp(0, 0)); pt->setType(kCCProgressTimerTypeBar); pt->setBarChangeRate(ccp(1, 0)); pt->setPercentage(0); pt->setPosition(ccp(width / 2, height / 2 - 5)); this->addChild(pt, 1, 3); label = CCLabelTTF::create("Loading ……", "arial", 30); label->setColor(ccc3(255, 255, 0)); label->setPosition(ccp(width / 2, height / 2 + 100)); this->addChild(label, 2, 5); this->resources(); return true; } CCScene* LoadingScene::scene() { CCScene* scene = CCScene::create(); scene->addChild(LoadingScene::create()); return scene; } void LoadingScene::resources() { CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/welcomebg.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/coder.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 添加关于开发者背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/button_sound_on.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 声音开始 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/button_sound_off.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 声音关闭 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/coder_up.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 开发者按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/coder_down.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 开发者按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/return_down.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 返回菜单按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/return_up.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 返回菜单按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/star_down.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 开始菜单按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/star_up.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/gamebg.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 欢迎界面 背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/weapon.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 弓弩武器 CCTextureCache::sharedTextureCache()->addImageAsync("game/wq0.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 弓箭子弹 CCTextureCache::sharedTextureCache()->addImageAsync("game/monster_blood.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 血条背景 CCTextureCache::sharedTextureCache()->addImageAsync("game/monster_blood_frame.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 血条 CCTextureCache::sharedTextureCache()->addImageAsync("monster/dutu.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 赌徒怪物 CCTextureCache::sharedTextureCache()->addImageAsync("game/zcblood.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 主城血条 CCTextureCache::sharedTextureCache()->addImageAsync("game/magic.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 主城魔法条 CCTextureCache::sharedTextureCache()->addImageAsync("game/panelblood.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 主城血条和魔法条的背景 CCTextureCache::sharedTextureCache()->addImageAsync("game/jnl.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 魔法阵背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/jnzt.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 魔法阵CD 亮的图片 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/pause_button.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图是游戏暂停按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/btn_home_down.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图是游戏家按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/btn_home_up.png", this, callfuncO_selector(LoadingScene::loadCallBack)); CCTextureCache::sharedTextureCache()->addImageAsync("gmme/btn_resume_down.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图是游戏继续按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/btn_resume_up.png", this, callfuncO_selector(LoadingScene::loadCallBack)); CCTextureCache::sharedTextureCache()->addImageAsync("gmme/btn_retry_down.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图是游戏重新开始按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/btn_rety_up.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图是游戏暂停按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/pause_bg.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图是游戏暂停按钮 CCTextureCache::sharedTextureCache()->addImageAsync("game/MagicMatrix.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图魔法阵的图片 CCTextureCache::sharedTextureCache()->addImageAsync("specia/ligtht.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图闪电特效图片 CCTextureCache::sharedTextureCache()->addImageAsync("specia/diyu.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图地狱石块特效图片 CCTextureCache::sharedTextureCache()->addImageAsync("specia/long.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图二龙戏珠特效图片 CCTextureCache::sharedTextureCache()->addImageAsync("specia/thumbnails.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图特效缩略图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/woniubj.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图地蜗牛进度条背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/woniujd.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图蜗牛进度条图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/woniu.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图蜗牛图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/stage_title.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图等级的背景图 CCTextureCache::sharedTextureCache()->addImageAsync("game/gameover.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图游戏结束标题图 CCTextureCache::sharedTextureCache()->addImageAsync("game/gameovertips.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图游戏结束提示图 CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/gameoverbg.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图游戏结背景图 CCTextureCache::sharedTextureCache()->addImageAsync("game/coin.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 此图金币图标 CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/stats_bg.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 胜利界面背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/statstip.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 胜利界面提示按钮 CCTextureCache::sharedTextureCache()->addImageAsync("gmbg/research_bg.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 能力提升界面的背景图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/lvSyspng.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 能力提升界面的按钮图片 CCTextureCache::sharedTextureCache()->addImageAsync("game/lvinfo.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 能力提升界面的说明文字图片 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/outdown.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 游戏结束按钮图片 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/outup.png", this, callfuncO_selector(LoadingScene::loadCallBack)); CCTextureCache::sharedTextureCache()->addImageAsync("gmme/updwon.png", this, callfuncO_selector(LoadingScene::loadCallBack)); // 升级系统图片 CCTextureCache::sharedTextureCache()->addImageAsync("gmme/upup.png", this, callfuncO_selector(LoadingScene::loadCallBack)); } void LoadingScene::loadCallBack(CCObject* object) { count++; CCProgressTimer* pt = (CCProgressTimer*)this->getChildByTag(3); int percentage = (int)count * 100 / total; char tem[32]; sprintf(tem, "Loading %d", percentage); CCLOG(tem); label->setString(tem); pt->setPercentage(percentage); if (count == total) { //加载完成就切换场景 CCScene* hello = HelloWorld::scene(); CCTransitionMoveInL* effect = CCTransitionMoveInL::create(2.0f, hello); CCDirector::sharedDirector()->replaceScene(effect); } } LoadingScene::LoadingScene() { } LoadingScene::~LoadingScene() { }
然后切换场景后直接可以在另一场景中直接从缓存中加载资源了
CCTexture2D* texture = CCTextureCache::sharedTextureCache()->textureForKey("game/MagicMatrix.png"); CCSprite* sprite = CCSprite::createWithTexture(texture); sprite->setPosition(ccp(width / 2, height / 2)); this->addChild(sprite);
效果图：
加载资源中
加载完成，切换场景
在另一场景中直接从缓存加载图片资源，就是中间这个咒符
