使用Sebyddd的答案,我稍微修改了代码以显示多个背景图像的堆栈(确切地说是7张背景图像)。并添加了更多的代码,以帮助那些正在努力学习的人。
在MyScene.h中:
@interface MyScene : SKScene
{
SKSpriteNode *bg1;
SKSpriteNode *bg2;
SKSpriteNode *bg3;
SKSpriteNode *bg4;
SKSpriteNode *bg5;
SKSpriteNode *bg6;
SKSpriteNode *bg7;
}
在MyScene.m文件中:
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
bg1 = [SKSpriteNode spriteNodeWithImageNamed:@"background1"];
bg1.anchorPoint = CGPointZero;
bg1.position = CGPointMake(0, 0);
[self addChild:bg1];
bg2 = [SKSpriteNode spriteNodeWithImageNamed:@"background2"];
bg2.anchorPoint = CGPointZero;
bg2.position = CGPointMake(bg1.size.width-1, 0);
[self addChild:bg2];
bg3 = [SKSpriteNode spriteNodeWithImageNamed:@"background3"];
bg3.anchorPoint = CGPointZero;
bg3.position = CGPointMake(bg2.size.width-1, 0);
[self addChild:bg3];
bg4 = [SKSpriteNode spriteNodeWithImageNamed:@"background4"];
bg4.anchorPoint = CGPointZero;
bg4.position = CGPointMake(bg3.size.width-1, 0);
[self addChild:bg4];
bg5 = [SKSpriteNode spriteNodeWithImageNamed:@"background5"];
bg5.anchorPoint = CGPointZero;
bg5.position = CGPointMake(bg4.size.width-1, 0);
[self addChild:bg5];
bg6 = [SKSpriteNode spriteNodeWithImageNamed:@"background6"];
bg6.anchorPoint = CGPointZero;
bg6.position = CGPointMake(bg5.size.width-1, 0);
[self addChild:bg6];
bg7 = [SKSpriteNode spriteNodeWithImageNamed:@"background7"];
bg7.anchorPoint = CGPointZero;
bg7.position = CGPointMake(bg6.size.width-1, 0);
[self addChild:bg7];
}
}
- (void)update:(NSTimeInterval)currentTime {
[self moveBackground];
}
-(void)moveBackground
{
bg1.position = CGPointMake(bg1.position.x-4, bg1.position.y);
bg2.position = CGPointMake(bg2.position.x-4, bg2.position.y);
bg3.position = CGPointMake(bg3.position.x-4, bg3.position.y);
bg4.position = CGPointMake(bg4.position.x-4, bg4.position.y);
bg5.position = CGPointMake(bg5.position.x-4, bg5.position.y);
bg6.position = CGPointMake(bg6.position.x-4, bg6.position.y);
bg7.position = CGPointMake(bg7.position.x-4, bg7.position.y);
if (bg1.position.x < -bg1.size.width){
bg1.position = CGPointMake(bg7.position.x + bg7.size.width, bg1.position.y);
}
if (bg2.position.x < -bg2.size.width) {
bg2.position = CGPointMake(bg1.position.x + bg1.size.width, bg2.position.y);
}
if (bg3.position.x < -bg3.size.width) {
bg3.position = CGPointMake(bg2.position.x + bg2.size.width, bg3.position.y);
}
if (bg4.position.x < -bg4.size.width) {
bg4.position = CGPointMake(bg3.position.x + bg3.size.width, bg4.position.y);
}
if (bg5.position.x < -bg5.size.width) {
bg5.position = CGPointMake(bg4.position.x + bg4.size.width, bg5.position.y);
}
if (bg6.position.x < -bg6.size.width) {
bg6.position = CGPointMake(bg5.position.x + bg5.size.width, bg6.position.y);
}
if (bg7.position.x < -bg7.size.width) {
bg7.position = CGPointMake(bg6.position.x + bg6.size.width, bg7.position.y);
}
}