Question

我正在寻找在第一次触摸时在Box2D中创建身体的方法并再次摧毁它。

要创建正文，我正在使用此方法：

(void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView: [touch view]];
    location = [[CCDirector sharedDirector] convertToGL: location];

    if (touch.tapCount > 1) {
        CGSize winSize = [CCDirector sharedDirector].winSize;
        CCSprite *sprite = [CCSprite spriteWithFile:@"sprite.png" rect:CGRectMake(0, 0, 90, 90)];

        sprite.position = ccp(location.x/PTM_RATIO, location.y/PTM_RATIO);
        sprite.tag = 7;
        [self addChild: sprite];

        b2BodyDef ballBodyDef2;
        ballBodyDef2.type = b2_dynamicBody;
        ballBodyDef2.position.Set(location.x/PTM_RATIO, location.y/PTM_RATIO);
        ballBodyDef2.userData = sprite;

        b2Body *body2 = _world->CreateBody(&ballBodyDef2);

        b2CircleShape circle;
        circle.m_radius = 22.0/PTM_RATIO;//(arc4random()*26.0)/PTM_RATIO;

        b2FixtureDef ballShapeDef2;
        ballShapeDef2.shape = &circle;
        ballShapeDef2.density = 1.0f;
        ballShapeDef2.friction = 0.5f;
        ballShapeDef2.restitution = 0.2f;

        body2->CreateFixture(&ballShapeDef2);
    } else {
        b2Vec2 locationWorld = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);

        for (b2Body* b = _world->GetBodyList(); b; b = b->GetNext()) {
            b2Fixture *bf1 = b->GetFixtureList();
            if (bf1->TestPoint(locationWorld)) {
                CCSprite *tempSprite = (CCSprite *) b->GetUserData();
                if (tempSprite .tag==7) {
                    [self removeChild:tempSprite cleanup:YES];
                    _world->DestroyBody(b);
                }
            }
        }
    }
}

使用这种方法，要创建身体，我必须触摸屏幕2次，然后再次触发它。我需要做什么，你点击一次创建身体，然后再次点击以消灭？

Answer 1

通过这种方式，您可以在点击一次时创建正文，然后再次点击以销毁

    if (isBodyCreated ==NO)
    {
        isBodyCreated=YES;
        CGSize winSize = [CCDirector sharedDirector].winSize;
        CCSprite *sprite = [CCSprite spriteWithFile:@"Icon.png"];

        sprite.position = ccp(location.x/PTM_RATIO, location.y/PTM_RATIO);
        sprite.tag = 7;
        [self addChild: sprite];

        b2BodyDef ballBodyDef2;
        ballBodyDef2.type = b2_dynamicBody;
        ballBodyDef2.position.Set(location.x/PTM_RATIO, location.y/PTM_RATIO);
        ballBodyDef2.userData = sprite;

        b2Body *body2 = world->CreateBody(&ballBodyDef2);

        b2CircleShape circle;
        circle.m_radius = 22.0/PTM_RATIO;//(arc4random()*26.0)/PTM_RATIO;

        b2FixtureDef ballShapeDef2;
        ballShapeDef2.shape = &circle;
        ballShapeDef2.density = 1.0f;
        ballShapeDef2.friction = 0.5f;
        ballShapeDef2.restitution = 0.2f;

        body2->CreateFixture(&ballShapeDef2);
    } 
    else 
    {
        b2Vec2 locationWorld = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);

        for (b2Body* b = world->GetBodyList(); b; b = b->GetNext()) 
        {
            b2Fixture *bf1 = b->GetFixtureList();
            if (bf1->TestPoint(locationWorld))
            {
                CCSprite *tempSprite = (CCSprite *) b->GetUserData();
                if (tempSprite .tag==7) 
                {
                    [self removeChild:tempSprite cleanup:YES];
                    world->DestroyBody(b);
                    isBodyCreated=NO;
                }
            }
        }
    }

我希望这会对你有所帮助。

触摸创造身体触摸破坏身体

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