小编use*_*149的帖子

我怎样才能创建一个每两秒触发一次的计时器,它会在我屏幕上的HUD上将分数增加一个？这是我对HUD的代码:

    @implementation MyScene
{
    int counter;
    BOOL updateLabel;
    SKLabelNode *counterLabel;
}

-(id)initWithSize:(CGSize)size
{
    if (self = [super initWithSize:size])
    {
        counter = 0;

        updateLabel = false;

        counterLabel = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
        counterLabel.name = @"myCounterLabel";
        counterLabel.text = @"0";
        counterLabel.fontSize = 20;
        counterLabel.fontColor = [SKColor yellowColor];
        counterLabel.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeCenter;
        counterLabel.verticalAlignmentMode = SKLabelVerticalAlignmentModeBottom;
        counterLabel.position = CGPointMake(50,50); // change x,y to location you want
        counterLabel.zPosition = 900;
        [self addChild: counterLabel];
    }
}

我想知道如何用spritekit创建一个墙.物体上的物体无法移动过去.我知道我可以使用这段代码:

self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];

...但是当我使用该代码时,我基本上也得到了"底线".我希望物体能够通过屏幕底部但不能离开侧面.

在此先感谢您的帮助!

最好的问候,路易斯.

我是如何停止并从屏幕顶部落到屏幕底部的物体弹跳.这是该对象的代码:

- (SKNode*)addRock {
    SKSpriteNode* rock = [SKSpriteNode spriteNodeWithImageNamed:@"asteroid"];
    rock.position=CGPointMake ([self makeRandomXWBetween:0 and:self.size.width],self.size.height);
    rock.name = @"rock";
    rock.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:rock.size];
    rock.physicsBody.usesPreciseCollisionDetection = YES;
    rock.physicsBody.allowsRotation = NO;
    [self addChild:rock];

    return self;
}

}

在此先感谢您的帮助.

最好的问候,路易斯.