CVP认证学习笔记--李天宇027对资源的管理

本节学习了cocos的资源加载,这次更改了CCLoaderScene里的代码(也可以在自己新建一个类定义载入界面,这里为了方便起见)，将载入界面的外观进行了修改，并且在此基础上实施了纹理的添加cc.textureCache.addImage()和删除纹理cc.textureCache.dumpCachedTextureInfo()。下边是CCLoaderScene里的部分代码：

首先是init()函数：

init : function(){

        var self = this;

 

        //logo

        var logoWidth = 160;

        var logoHeight = 200;

 

        // bg

        var bgLayer = self._bgLayer = new cc.LayerColor(cc.color(199, 21, 133, 255));

        self.addChild(bgLayer, 0);

        var size = cc.winSize;

        //image move to CCSceneFile.js

        var fontSize = 24, lblHeight =  -logoHeight / 2 + 100;

        if(cc._loaderImage){//这个图片在Base64Image中保存，我们可以替换

            //loading logo

            cc.loader.loadImg(cc._loaderImage, {isCrossOrigin : false }, function(err, img){

                logoWidth = img.width;

                logoHeight = img.height;

                self._initStage(img, cc.visibleRect.center);

            });

            fontSize = 14;

            lblHeight = -logoHeight / 2 - 10;

        }

        //loading percent 加载进度

        var label = self._label = new cc.LabelTTF("Loading... 0%", "Arial", fontSize);

        label.setPosition(cc.pAdd(cc.visibleRect.center, cc.p(0, lblHeight)));

        label.setColor(cc.color(180, 180, 180));

        bgLayer.addChild(this._label, 10);

        

        cc.textureCache.addImage("res/32636-4.png");

        cc.textureCache.dumpCachedTextureInfo();

        var mylogo = cc.textureCache.getTextureForKey("res/32636-4.png");

        cc.log("成功加载loading界面的32636-4.png图片");

        var sp = new cc.Sprite(mylogo);

        sp.setPosition(size.width/2,300);

        this.addChild(sp);

        sp.setTag(100);

        return true;

    }

我们可以通过更改Base64Image里边的代码来修改载入界面的背景图。同样onEnter和onExit方法也如下：

    onEnter: function () {

        var self = this;

        cc.Node.prototype.onEnter.call(self);

        self.schedule(self._startLoading, 0.3);

    },

    /**

     * custom onExit

     */

    onExit: function () {

        cc.Node.prototype.onExit.call(this);

        var tmpStr = "Loading... 0%";

        this._label.setString(tmpStr);

        cc.textureCache.removeAllTextures();

        cc.textureCache.dumpCachedTextureInfo();

        cc.log("加载结束,清除所有纹理");

    },

在帧结束时，清理纹理。

作业传送门：

http://www.cocoscvp.com/usercode/2016_05_22/9a01ae13cb017dab984dba22839e8d1873be4fa9/