我正在尝试使用Apple的SpriteKit进行侧滚动游戏.当想要制作无休止的滚动背景时,我遇到了这个
answer.
在实施解决方案后,它似乎确实有效,尽管它显着降低了我的FPS.这可能是由于在每一帧上重新计算图像位置的事实.
我觉得如果我可以使用一个或多个SKAction调用来处理这个动画会更好,但我不确定如何实现它.
思考？
到目前为止我在我的场景类中的代码(这只是在屏幕上激活了一次背景)
- - (void)addBackgroundTileAtPoint:(CGPoint)point {
- SKSpriteNode *bg = [SKSpriteNode spriteNodeWithImageNamed:@"background"];
- bg.anchorPoint = CGPointZero;
- bg.position = point;
- bg.name = @"background";
- bg.zPosition = -99;
- [self addChild:bg];
- SKAction *sequence = [SKAction sequence:@[
- [SKAction moveByX:-(bg.size.width * 2) y:0 duration:10],[SKAction removeFromParent]
- ]];
- [bg runAction: sequence];
- }
解决方法
我在上一个开源项目中为一个特殊的需求做了一个名为SKScrollingNode的小组件：
SprityBird.
即使有3层或4层(视差),FPS也不是问题,但您可能需要自己尝试.
要使用它,您只需像任何其他节点一样添加它并给它一个scrollingSpeed likeo：
- back = [SKScrollingNode scrollingNodeWithImageNamed:@"back" inContainerWidth:WIDTH(self)];
- [back setScrollingSpeed:BACK_SCROLLING_SPEED];
- [self addChild:back];
SKScrollingNode.h
- @interface SKScrollingNode : SKSpriteNode
- @property (nonatomic) CGFloat scrollingSpeed;
- + (id) scrollingNodeWithImageNamed:(NSString *)name inContainerWidth:(float) width;
- - (void) update:(NSTimeInterval)currentTime;
- @end
SKScrollingNode.m
- @implementation SKScrollingNode
- + (id) scrollingNodeWithImageNamed:(NSString *)name inContainerWidth:(float) width
- {
- UIImage * image = [UIImage imageNamed:name];
- SKScrollingNode * realNode = [SKScrollingNode spriteNodeWithColor:[UIColor clearColor] size:CGSizeMake(width,image.size.height)];
- realNode.scrollingSpeed = 1;
- float total = 0;
- while(total<(width + image.size.width)){
- SKSpriteNode * child = [SKSpriteNode spriteNodeWithImageNamed:name ];
- [child setAnchorPoint:CGPointZero];
- [child setPosition:CGPointMake(total,0)];
- [realNode addChild:child];
- total+=child.size.width;
- }
- return realNode;
- }
- - (void) update:(NSTimeInterval)currentTime
- {
- [self.children enumerateObjectsUsingBlock:^(SKSpriteNode * child,NSUInteger idx,BOOL *stop) {
- child.position = CGPointMake(child.position.x-self.scrollingSpeed,child.position.y);
- if (child.position.x <= -child.size.width){
- float delta = child.position.x+child.size.width;
- child.position = CGPointMake(child.size.width*(self.children.count-1)+delta,child.position.y);
- }
- }];
- }
- @end
