无法使背景无限滚动

Question

我正在用 sprite kit 和 objective c 制作游戏。目前我正试图让我的背景无限滚动。我似乎无法完成这项工作。这是我的代码：

SKAction 方法

-(void) setUpActions {
SKAction* move = [SKAction moveByX:-landscape.frame.size.width * 2 y:0 duration:2.0];
SKAction* reset = [SKAction moveByX:landscape.frame.size.width * 2 y:0 duration:0.0];
SKAction* moveInfinitely = [SKAction sequence:@[move, reset]];


//background and log Moving Actions
moveOver = [SKAction repeatActionForever:moveInfinitely];
}

SKAction调用方法

-(void) runTheAction {
[landscape runAction:moveOver];
}

当我运行应用程序时，我的屏幕上没有任何显示。

Answer 1

创建两个背景精灵。

// create 2 background sprites
    bg1 = [SKSpriteNode spriteNodeWithImageNamed:@"bg1"];
    bg1.anchorPoint = CGPointZero;
    bg1.position = CGPointMake(0, 0);
     [self addChild:bg1];

    bg2 = [SKSpriteNode spriteNodeWithImageNamed:@"bg2"];
    bg2.anchorPoint = CGPointZero;
    bg2.position = CGPointMake(bg1.size.width-1, 0);
     [self addChild:bg2];

然后在更新方法中：

bg1.position = CGPointMake(bg1.position.x-4, bg1.position.y);
bg2.position = CGPointMake(bg2.position.x-4, bg2.position.y);

if (bg1.position.x < -bg1.size.width){
    bg1.position = CGPointMake(bg2.position.x + bg2.size.width, bg1.position.y);
}

if (bg2.position.x < -bg2.size.width) {
    bg2.position = CGPointMake(bg1.position.x + bg1.size.width, bg2.position.y);
}

这应该很简单

无法使背景无限滚动

Having trouble making background scroll infinitely

objective-c

ios