Question

首先尝试使用Chipmunk。

没有碰撞检测注册就是问题。

我的代码：

@implementation MainPlayScene
{
    CCPhysicsNode *_physics;
    CCNode *MyPhysicsBody;
    CCNode *bottomBody;

}

+ (instancetype)scene
{
    return [[self alloc] init];
}

- (instancetype)init
 {
 // Apple recommend assigning self with      supers return value, and handling self not created
    self = [super init];
    if (!self) return(nil);

    _physics = [CCPhysicsNode node];
    _physics.debugDraw = YES;
    [self addChild:_physics z:1];

 /// BOTTOM
    CGRect bottomRect = CGRectMake(0, 0,      [CCDirector sharedDirector].viewSize.width, 10);
    bottomBody = [CCNode node];
    bottomBody.physicsBody = [CCPhysicsBody bodyWithPolylineFromRect:bottomRect     cornerRadius:0];
    bottomBody.physicsBody.collisionCategories = @[@"Bottom"];
   bottomBody.physicsBody.type =     CCPhysicsBodyTypeStatic;
    [_physics addChild:bottomBody];

  /// MyBody to bounce around
    MyPhysicsBody = [CCSprite spriteWithImageNamed:@"MyBody-64x64-24.png"];
    MyPhysicsBody.position = ccp((self.contentSize.width/2),(self.contentSize.height/2));
    MyPhysicsBody = [CCNode node];
    MyPhysicsBody.physicsBody = [CCPhysicsBody bodyWithRect:(CGRect){CGPointZero,  MyPhysicsBody.contentSize.height,MyPhysicsBody.contentSize.width} cornerRadius:0];
      MyPhysicsBody.physicsBody.collisionCategories = @[@"MyBody"];
    [_physics addChild:MyPhysicsBody z:150];

    self.userInteractionEnabled = YES;
    return self;
}

检测触摸事件并对物理体施加力以使其在底部上下反弹

 - (void)touchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{   
    CCLOG(@"Touch Detected");
    [MyPhysicsBody.physicsBody applyImpulse:ccp(0, 300.f)];
}

现在我尝试在“Bottom”上检测到碰撞，但即使我看到2个对象的调试行触摸，也没有注册任何内容。

/// try onCollisionEnter first ... nothing 
-(void)onCollisionEnter:(CCNode *)entity collisionPair:(CCPhysicsCollisionPair *)pair
{
    if ([entity.physicsBody.collisionCategories  isEqual: @"Bottom"]) {
        CCLOG(@"Hit bottomBody");
    }

}

/// try ccPhysicsCollisionBegin pair ... nothing
-(BOOL)ccPhysicsCollisionBegin:(CCPhysicsCollisionPair *)pair MyBody:(CCNode *) MyBody Botton:(CCNode *)Bottom
{
     CCLOG(@"Hit bottomBody");
     return TRUE;
}

显然我在这里缺少一些关键的东西......

非常感谢任何帮助！

由于

Answer 1

我发现很难看到你发布的所有内容的相关代码。

我将举例说明2 CCSprite个物体碰撞检测。一个叫_arrow，另一个叫_obstacle。

第一步是定义碰撞类型，如下所示：

_arrow.physicsBody.collisionType = @"arrow";
_obstacle.physicsBody.collisionType = @"obstacle";

第二步是定义回调

-(BOOL)ccPhysicsCollisionBegin:(CCPhysicsCollisionPair *)pair arrow:(CCNode *)arrow obstacle:(CCNode *)obstacle
{
    // Do some cool stuff
    return TRUE;
}

根据这些精灵的碰撞类型注意命名，箭头和障碍物。

第三，你忘记做的就是设置委托，这样你就可以在 physicsNode 对象上实际调用这些方法

_physics.collisionDelegate = self;

self（通常只是你的场景）应该实现CCPhysicsCollisionDelegate协议。

Answer 2

Tibor有正确的答案，但有一个重要的线索，我错过了这让我发疯。来自CCPhysicsNode.h的{{1}}部分中的评论：

CCPhysicsCollisionDelegate

所以我错误地尝试实现这样的东西：

The final two parameter names (typeA/typeB) should be replaced
with names used with CCPhysicsBody.collisionType or
CCPhysicsShape.collisionType.
If both final parameter names are "default" then the collision
method is called when a more specific method isn't found.

但那是错误!!! 我想要实现的正确之处是：

-(BOOL) ccPhysicsCollisionBegin:(CCPhysicsCollisionPair *)pair typeA:(CCNode *)nodeA typeB:(CCNode *)nodeB
{
    // Compare if we're ignored collisions
    if (([nodeA.physicsBody.collisionType isEqualToString: @"foo"])
    ||  ([nodeB.physicsBody.collisionType isEqualToString: @"foo"]) )
    {
        return NO;
    }

    return YES;
}

请注意忽略的碰撞类型 方法签名的一部分 。

呼！

修改

为完整起见，请不要忘记：

-(BOOL) ccPhysicsCollisionBegin:(CCPhysicsCollisionPair *)pair foo:(CCNode *)nodeA foo:(CCNode *)nodeB { return NO; }

Answer 3

您正在设置碰撞类别，与碰撞遮罩一起允许您放弃某些碰撞。碰撞类型属性适用于委托方法。

Cocos2d v3＆amp;花栗鼠碰撞检测问题

3 个答案: