关于3D sample和最新版3.7引擎的坑,MoveTo之reverse函数

Cocos2d-x
#1

3D sample里面的底层应该跟最新版本3.7的有些出入

其中里面用了这个函数

 _moveAction->reverse()


```


声明如下



class Animate3DTest : public Sprite3DTestDemo
{
public:
    CREATE_FUNC(Animate3DTest);
    Animate3DTest();
    ~Animate3DTest();
    virtual std::string title() const override;
    virtual std::string subtitle() const override;
    
    void onTouchesEnded(const std::vector& touches, Event* event);
    
    virtual void update(float dt) override;
    
protected:
    void addSprite3D();
    
    enum class State
    {
        SWIMMING,
        SWIMMING_TO_HURT,
        HURT,
        HURT_TO_SWIMMING,
    };
    
    void reachEndCallBack();
    
    void renewCallBack();
    
    cocos2d::Sprite3D* _sprite;
    
    cocos2d::Action* _swim;
    cocos2d::Animate3D* _hurt;

    float _elapseTransTime;
    
    State   _state;
    
    MoveTo* _moveAction;
};



void Animate3DTest::reachEndCallBack()
{
    _sprite->stopActionByTag(100);
    auto inverse = (MoveTo*)_moveAction->reverse();  //请看这里就是调用的地方如果您用了VS，请选中reverse() F12过去
    inverse->retain();
    _moveAction->release();
    _moveAction = inverse;
    auto rot = RotateBy::create(1.f, Vec3(0.f, 180.f, 0.f));
    auto seq = Sequence::create(rot, _moveAction, CallFunc::create(CC_CALLBACK_0(Animate3DTest::reachEndCallBack, this)), nullptr);
    seq->setTag(100);
    _sprite->runAction(seq);
}

//F12之后转到这里
MoveBy* MoveBy::reverse() const
{
    return MoveBy::create(_duration, -_positionDelta);
}



```


再请看一下3.7中MoveTo的定义


class CC_DLL MoveTo : public MoveBy
{
public:
    /** 
     * Creates the action.
     * @param duration Duration time, in seconds.
     * @param position The destination position in 2d.
     * @return An autoreleased MoveTo object.
     */
    static MoveTo* create(float duration, const Vec2& position);
    /**
     * Creates the action.
     * @param duration Duration time, in seconds.
     * @param position The destination position in 3d.
     * @return An autoreleased MoveTo object.
     */
    static MoveTo* create(float duration, const Vec3& position);

    //
    // Overrides
    //
    virtual MoveTo* clone() const override;
    virtual MoveTo* reverse() const  override;
    virtual void startWithTarget(Node *target) override;
    
CC_CONSTRUCTOR_ACCESS:
    MoveTo() {}
    virtual ~MoveTo() {}
}

MoveTo* MoveTo::reverse() const
{
    CCASSERT(false, "reverse() not supported in MoveTo");
    return nullptr;
}


```


最新版的更新文件我没有详细查阅,但是请使用最新版的同学能够注意到这个坑,尽量节省开发时间...
#2

2楼附上解决办法

请找到注释掉moveto声明文件里面的这句话

class CC_DLL MoveTo : public MoveBy
{
public:
    /** 
     * Creates the action.
     * @param duration Duration time, in seconds.
     * @param position The destination position in 2d.
     * @return An autoreleased MoveTo object.
     */
    static MoveTo* create(float duration, const Vec2& position);
    /**
     * Creates the action.
     * @param duration Duration time, in seconds.
     * @param position The destination position in 3d.
     * @return An autoreleased MoveTo object.
     */
    static MoveTo* create(float duration, const Vec3& position);

    //
    // Overrides
    //
    virtual MoveTo* clone() const override;
    //virtual MoveTo* reverse() const  override;
    virtual void startWithTarget(Node *target) override;
    
CC_CONSTRUCTOR_ACCESS:
    MoveTo() {}
    virtual ~MoveTo() {}
}

//同样注释掉
/*
MoveTo* MoveTo::reverse() const
{
    CCASSERT(false, "reverse() not supported in MoveTo");
    return nullptr;
}
*/

```


重新编译,然后您使用reverse函数自动就会指向父类的reverse函数了