ios - spriteKit 中的常规碰撞错误

Question

我正在制作一个非常简单的跳跃游戏。当我的“英雄”与地面发生碰撞时，它会调用 didBeginContact 并进行跳跃。非常基本，但效果不佳，因为一段时间后(有时更快，有时更晚......)它停止工作，如您所见。我想知道我是否做错了什么，或者是否有更好的方法，或者 spriteKit 中是否存在我从未听说过的已知错误......图片是gif。如果看不到运动，请在新标签页中打开它

@interface XYZWorld1()
@property (nonatomic)  SKSpriteNode *hero;
@property (nonatomic) SKSpriteNode *groundPhysics;
@end


@implementation XYZWorld1
static const uint32_t ground = 0x2 << 2;
static const uint32_t bee = 0x3 << 3;

创建地面的方法:

    -(SKSpriteNode*)createGroundxPos:(float)x yPos:(float)y width:(CGFloat)width height:(CGFloat)height
{
    SKSpriteNode *ground = [SKSpriteNode spriteNodeWithColor:[UIColor colorWithHue:1 saturation:1 brightness:1 alpha:1] size:CGSizeMake(width, height)];
    SKPhysicsBody *groundFisica =[SKPhysicsBody bodyWithRectangleOfSize:ground.size];
    [ground setName:@"ground"];
    [groundFisica setDynamic:NO];
    [groundFisica setAffectedByGravity:NO];
    [groundFisica setAllowsRotation:NO];
    [groundFisica setRestitution:0];
    [groundFisica setUsesPreciseCollisionDetection:YES];
    [groundFisica setCategoryBitMask:ground];
    [groundFisica setContactTestBitMask:bee];
    [groundFisica setCollisionBitMask:bee];
    ground.physicsBody = groundFisica;
    [ground setPosition:CGPointMake(x, y)];
    return ground;

}

创建英雄的方法

-(SKSpriteNode*)crearHero
{
    SKTexture *temp = _heroWalkingFrames[0];
    SKSpriteNode *hero = [SKSpriteNode spriteNodeWithTexture:temp];

    hero.name = @"hero";
    hero.zPosition = 1;
    if(IS_IPHONE_5){
        [hero setPosition:CGPointMake(100, 280)];
    }
    else {
        [hero setPosition:CGPointMake(100, 220)];
    }

    [hero setSize:CGSizeMake(25, 25)];
    hero.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(23, 24)];

    [hero.physicsBody setDensity:0.95];
    [hero.physicsBody setDynamic:YES];
    [hero.physicsBody setAffectedByGravity:YES];
    [hero.physicsBody setAllowsRotation:NO];
    [hero.physicsBody setUsesPreciseCollisionDetection:YES];
    [hero.physicsBody setRestitution:0];
    [hero.physicsBody setVelocity:CGVectorMake(0, 0)];
    return hero;
}

游戏开始前预加载所有东西的方法:

-(void)preloadAssets
{
    //hero
    _heroWalkingFrames = [self cargarArrayAtlas:@"astroJump.atlas" imageName:@"astronautaJump_000"];
    _hero = [self crearHero];

    _hero.physicsBody.categoryBitMask = bee;
    _hero.physicsBody.collisionBitMask = bee | cubico | ground | bicho ;
    _hero.physicsBody.contactTestBitMask = bee | cubico | ground | bicho  ;


//Ground
_groundPhysics = [self createGroundxPos:100 yPos:142 width:42 height:23.25];
}

两个物体第一次接触时调用的方法:

-(void) didBeginContact:(SKPhysicsContact *)contact 
{
    //if hero collides with ground

    if((contact.bodyA.categoryBitMask == bee && contact.bodyB.categoryBitMask == ground) ||
       (contact.bodyA.categoryBitMask == ground && contact.bodyB.categoryBitMask == bee) )
    {

        if(_jumping == NO && _groundPhysics.position.y+_groundPhysics.size.height/2<=_hero.position.y-11.5)
        {

            [self jumping];
        }
    }
}

跳转调用的方法:

-(void)jumping{
    //Play sound file
    [self runAction:self.jumpSound withKey:@"jumpSound"];


    if(IS_IPHONE_5){
        _diferencia=(164 * 9)/_hero.position.y;

    }else{
        _diferencia=(164 * 7)/_hero.position.y;
    }


    [_hero.physicsBody applyImpulse:CGVectorMake(0,_diferencia)];
    _jumping = YES;
    [_hero removeActionForKey:@"astroJump"];
    [self astroJump];
}

-(void)astroJump
{
    //runAction animation method
    [_hero runAction:[SKAction animateWithTextures:_heroWalkingFrames
                                       timePerFrame:0.05f
                                             resize:NO
                                            restore:NO] withKey:@"astroJump"];
    return;
}

if 语句中的 bool 值(self.jumping)，在 update 和 initGameContent 中:

-(void)update:(CFTimeInterval)currentTime
{
if(_hero.physicsBody.velocity.dy < 0 )_jumping = NO;
}

-(void)initGameContent
{

    _jumping = NO;

Answer 1

当检测到与地面接触时，您可能需要确保将玩家位置重置为高于地面。否则，当调用 [self Jump]; 时，玩家仍可能与地面接触，这有时会导致玩家被“卡住”。在进行碰撞检测时，我在我的游戏中看到过类似的问题。下面的代码显示了您可以采取哪些措施来解决此问题。

if (_jumping == NO && _groundPhysics.position.y+_groundPhysics.size.height/2<=_hero.position.y-11.5)
{
    _hero.position.y = _groundPhysics.position.y + _groundPhysics.size.height/2 + 1;
    [self jumping];
}