我试图在我的应用程序的背景中制作滚动效果
精灵从北向南移动
这是成功的但是如何重复精灵精灵来继续这样做？精灵向南移动并看到png文件的末尾，怎么能让它在这一点重复，所以精灵永远不会结束？谢谢！
- (void) Buildings
{
rightBuilding = [CCSprite spriteWithImageNamed:@"rightBuilding.png"];
rightBuilding.positionType = CCPositionTypeNormalized;
rightBuilding.position = ccp(0.9f, 0.5f);
[self addChild:rightBuilding];
}
- (void) scrollBuildings:(CCTime)dt
{
rightBuilding.position = ccp(rightBuilding.position.x, rightBuilding.position.y - .5);
}