Question

如何让我的应用计算此对象的次数：

    - (SKNode*)addRock {
    SKSpriteNode* rock = [SKSpriteNode spriteNodeWithImageNamed:@"asteroid"];
    //set the position to a random X value
    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;
    rock.physicsBody.categoryBitMask = rockCategory;
    rock.physicsBody.contactTestBitMask = dodgerCategory;

    [self addChild:rock];

    return self;
}

会点击此对象：

- (void)createFloor {
    SKNode *floor = [SKNode node];
    floor.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:CGRectMake(CGRectGetMinY(self.frame),1.0 , CGRectGetWidth(self.frame), 1)];
    floor.physicsBody.categoryBitMask = floorCategory;
    [self addChild: floor];
}

基本上，我希望该应用计算“addRock”的次数。对象将与＆＃39; createFloor＆＃39;对象以及他们联系的次数是否可以放在左上角。

提前感谢您的帮助！

Answer 1

创建一个计数器，使用didBeginContact：方法递增计数器并使用计数器更新SKLabelNode。

1）创建计数器：

@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];
    }
}

2）检查联系方式：

-(void)didBeginContact:(SKPhysicsContact *)contact
{
    uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
    if (collision == (dodgerCategory | floorCategory))
    {
        counter++;
        updateLabel = true;
    }
}

3）更新标签文字：

-(void)update:(CFTimeInterval)currentTime
{
    if(updateLabel == true)
    {
        counterLabel.text = [NSString stringWithFormat:@"Counter: %i",counter];
        updateLabel = false;
}

SpriteKit - 计算对象击中另一个对象的次数

1 个答案: