更改播放器动画时出错

Question

首先，我使用的是 cocos2d 3.6 一切正常，直到我按下键盘上的右箭头键，从按键事件侦听器执行 startRunning() 函数，操作成功停止但在下一行，this->runAction(Animate::create( runAnimation));，我得到错误。 runAnimation 没问题。我猜问题出在运行 new Action 但我不知道它是什么。

代码如下：

#pragma once

#include "cocos2d.h"

using namespace cocos2d;

const int DIR_RIGHT = 1;
const int DIR_LEFT = -1;




class CPlayer: public Sprite
{

private:
    Animation* idleAnimation;
    Animation* runAnimation;
    Animation* bowAnimation;
    Animation* climbAnimation;
    SpriteFrame* jumpFrame;
    SpriteFrame* fallFrame;
    SpriteFrame* wallJumpFrame;

    boolean onGround = true;
    boolean running = false;
    int dir = DIR_RIGHT;
    float movementSpeed = 50; //50 unit in world space 
    float stateTime=0;
public:

    Animation* createAnimation(const char* format, float delay, bool loop){

        Animation* animation = Animation::create();
        char str[100] = { 0 };
        int frameIndex = 1;
        do
        {
            sprintf(str, format, frameIndex);

            auto frame = SpriteFrameCache::getInstance()->getSpriteFrameByName(str);
            if (frame == NULL)
                break;
            animation->addSpriteFrame(frame);
            Texture2D::TexParams texParams = { GL_NEAREST, GL_NEAREST, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
            frame->getTexture()->setTexParameters(texParams);
            frameIndex++;
        } while (true);
        int loops = 1;
        if (loop)
            loops = -1;
        animation->setDelayPerUnit(delay);
        animation->setLoops(loops);


        return animation;

    }

    CPlayer(){

        idleAnimation = createAnimation("Idle/player_idle_%d.png", .2f, -1);
        runAnimation = createAnimation("Run/player_run_%d.png", .5f, -1);
        bowAnimation = createAnimation("Bow/bow_%d.png", .2f, -1);
        climbAnimation = createAnimation("Climb/player_climb_%d.png", .2f, -1);
        jumpFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName("Fall-Jump-WallJ/player_climb_jump.png");
        fallFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName("Fall-Jump-WallJ/player_climb_fall.png");
        wallJumpFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName("Fall-Jump-WallJ/player_climb_wall_jump.png");

        this->runAction(Animate::create(idleAnimation));
    }

    CREATE_FUNC(CPlayer);

    void startRunning(){
        running = true;

        if (onGround){
            this->stopAllActions();
            this->runAction(Animate::create( runAnimation));
        }
    }

    void endRunning(){
        running = false;
        if (onGround){
            this->stopAllActions();
            this->runAction(Animate::create(idleAnimation));
        }

    }

    void update(float delta){
        stateTime += delta;
        if (onGround && running){
            this->setPositionX(this->getPositionX() + delta*  movementSpeed*dir);

        }
    }

    void headToRight(){
        this->setFlipX(false);
        dir = DIR_RIGHT;
    }

    void headToLeft(){
        this->setFlippedX(true);
        dir = DIR_LEFT;
    }



};

Answer 1

您的 createAnimation 方法返回一个 autoreleased animation 对象，该对象在您使用它之前被释放。

要解决此问题，您需要在创建自动释放对象后保留它们，并在析构函数中或不再需要它们时释放它们：

CPlayer(){
    idleAnimation = createAnimation("Idle/player_idle_%d.png", .2f, -1);
    runAnimation = createAnimation("Run/player_run_%d.png", .5f, -1);
    bowAnimation = createAnimation("Bow/bow_%d.png", .2f, -1);
    climbAnimation = createAnimation("Climb/player_climb_%d.png", .2f, -1);
    idleAnimation->retain();
    runAnimation->retain();
    bowAnimation->retain();
    climbAnimation->retain();
    jumpFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName("Fall-Jump-WallJ/player_climb_jump.png");
    fallFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName("Fall-Jump-WallJ/player_climb_fall.png");
    wallJumpFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName("Fall-Jump-WallJ/player_climb_wall_jump.png");

    this->runAction(Animate::create(idleAnimation));
}

virtual ~CPlayer() {
    idleAnimation->release();
    runAnimation->release();
    bowAnimation->release();
    climbAnimation->release();
}