Ios 使用背景位置设置精灵

我是cocos2d的新手，如果可以，请帮助我

我有从右向左移动的背景，背景包含3行窗口的小窗口

_spaceDust1 = [CCSprite spriteWithFile:@"bg_front_spacedust.png"];
_spaceDust2 = [CCSprite spriteWithFile:@"bg_front_spacedust.png"];

    CGPoint dustSpeed = ccp(0.1 , 0.1);
    CGPoint bgSpeed = ccp(0.05 , 0.05);

    [_backgroundNode addChild:_spaceDust1 z:0 parallaxRatio:dustSpeed positionOffset:ccp(0,winSize.height / 2)];
    [_backgroundNode addChild:_spaceDust2 z:0 parallaxRatio:dustSpeed positionOffset:ccp(_spaceDust1.contentSize.width , winSize.height / 2)];

现在添加敌人，同时以相同的速度从右向左移动

        _robbers = [[CCArray alloc] initWithCapacity:kNumAstroids];
    for (int i = 0; i < kNumAstroids; ++i) {
        CCSprite *asteroid = [CCSprite spriteWithSpriteFrameName:@"robber.png"];
        asteroid.visible = NO;
        [_batchNode addChild:asteroid];
        [_robbers addObject:asteroid];
    }

一切进展顺利，但我想将此设置为窗口中的任意位置

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那么，我如何设置敌人的x参数，以便将其固定在背景窗口中呢？

由于某些原因，我无法发表评论，因此这是作为一个答案写的。你到底想干什么？我有点困惑。听起来你想把X的位置设置成3个随机位置中的一个，对吗

      double curTime = CACurrentMediaTime();
   if (curTime > _nextRunemanSpawn) {
    float randSecs = [self randomValueBetween:0.20 andValue:1.0];
    _nextRunemanSpawn = randSecs + curTime;

    float randY = 80.0;
    float randY1 = 185.0;
    float randY2 = 293.0;
    float randDuration = [self randomValueBetween:5.2 andValue:5.2];
    float randDuration1 = [self randomValueBetween:1.0 andValue:1.0];

    CCSprite *asteroid = [_robbers objectAtIndex:_nextRobber];
    _nextRobber++;

    if (_nextRobber >= _robbers.count) {
        _nextRobber = 0;
    }
    //[asteroid stopAllActions];
    int winChoice = arc4random() % 3;
    if (winChoice == 0) {
        asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY);
        asteroid.visible = YES;

    }
    else if(winChoice == 1){

        asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY1);
        asteroid.visible = YES;

    }else {
        asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY2);
        asteroid.visible = YES;

    }



    [asteroid runAction:[CCSequence actions:[CCMoveBy actionWithDuration:randDuration position:ccp(-winSize.width-asteroid.contentSize.width, 0)],
                         [CCCallFuncN actionWithTarget:self selector:@selector(setInvisible:)],nil]];