渲染框架 包括 CCDirector CCScene CCLayer CCSprinte 四類

CCDirector 核心類 導演與場景有關的函式 

// Scene Management

    /** Enters the Director's main loop with the given Scene.
     * Call it to run only your FIRST scene.
     * Don't call it if there is already a running scene.
     *
     * It will call pushScene: and then it will call startAnimation
     */
    void runWithScene(Scene *scene);

    /** Suspends the execution of the running scene, pushing it on the stack of suspended scenes.
     * The new scene will be executed.
     * Try to avoid big stacks of pushed scenes to reduce memory allocation.
     * ONLY call it if there is a running scene.
     */
    void pushScene(Scene *scene);

    /** Pops out a scene from the stack.
     * This scene will replace the running one.
     * The running scene will be deleted. If there are no more scenes in the stack the execution is terminated.
     * ONLY call it if there is a running scene.
     */
    void popScene();

    /** Pops out all scenes from the stack until the root scene in the queue.
     * This scene will replace the running one.
     * Internally it will call `popToSceneStackLevel(1)`
     */
    void popToRootScene();

    /** Pops out all scenes from the stack until it reaches `level`.
     If level is 0, it will end the director.
     If level is 1, it will pop all scenes until it reaches to root scene.
     If level is <= than the current stack level, it won't do anything.
     */
     void popToSceneStackLevel(int level);

    /** Replaces the running scene with a new one. The running scene is terminated.
     * ONLY call it if there is a running scene.
     */
    void replaceScene(Scene *scene);

    /** Ends the execution, releases the running scene.
     It doesn't remove the OpenGL view from its parent. You have to do it manually.
     * @lua endToLua
     */
    void end();

    /** Pauses the running scene.
     The running scene will be _drawed_ but all scheduled timers will be paused
     While paused, the draw rate will be 4 FPS to reduce CPU consumption
     */
    void pause();

    /** Resumes the paused scene
     The scheduled timers will be activated again.
     The "delta time" will be 0 (as if the game wasn't paused)
     */
    void resume();

    /** Stops the animation. Nothing will be drawn. The main loop won't be triggered anymore.
     If you don't want to pause your animation call [pause] instead.
     */
    virtual void stopAnimation() = 0;

    /** The main loop is triggered again.
     Call this function only if [stopAnimation] was called earlier
     @warning Don't call this function to start the main loop. To run the main loop call runWithScene
     */
    virtual void startAnimation() = 0;

    /** Draw the scene.
    This method is called every frame. Don't call it manually.
    */
    void drawScene();