Question

我一直在处理CCPhysicsSprite类中的联系人，因为我主要将userdata设置为CCPhysicsSprite。如下：

ContactListenerClass.mm：

void ContactListenerClass:: BeginContact(b2Contact *contact){

b2Fixture       *fixtureA = contact->GetFixtureA();
b2Fixture       *fixtureB = contact->GetFixtureB();
b2Body          *fixtureABody = fixtureA->GetBody();
b2Body          *fixtureBBody = fixtureB->GetBody();

CCPhysicsSprite* physicsSprite = (CCPhysicsSprite*)fixtureABody->GetUserData();
CCPhysicsSprite* physicsSprite2 = (CCPhysicsSprite*)fixtureBBody->GetUserData();

[physicsSprite spritesHadContact:physicsSprite2];

}

spritesHadContact方法在CCPhysicsSprite.mm类中：

-(void)spritesHadContact:(CCPhysicsSprite*)secondPhysicsSprite {
    int tag1 = self.tag;
    int tag2 = secondPhysicsSprite.tag;

    if ((tag1 == 30) && (tag2 == 40 )) || ((tag1 == 40) && (tag2 == 30))  {
      CCLOG(@"proceed to handle contact");
    }

上面的例子有点直截了当。但是当我开始创建和销毁关节时，我意识到除了处理联系人的CCPhysicsSprite之外还有一个类更好。我做了一个类（contactHandler）来做那个，但它不起作用。我不知道我做错了什么。请参阅以下内容：

ContactHandler.h：

#import "CCPhysicsSprite.h"

@interface ContactHandler : CCPhysicsSprite {

}

-(void)spritesHadContact:(CCPhysicsSprite*)firstPhysicsSprite otherSprite:(CCPhysicsSprite*)secondPhysicsSprite;

@end

ContactHandler.mm：

#import "ContactHandler.h"

@implementation ContactHandler

-(void)spritesHadContact:(CCPhysicsSprite*)firstPhysicsSprite otherSprite:(CCPhysicsSprite*)secondPhysicsSprite {
int tag1 = firstPhysicsSprite.tag;
int tag2 = secondPhysicsSprite.tag;

    if ((tag1 == 30) && (tag2 == 40 )) || ((tag1 == 40) && (tag2 == 30))  {
      CCLOG(@"proceed to handle contact");
}
@end

ContactListenerClass.h：

#import <Foundation/Foundation.h>
#import "cocos2d.h"
#import "Box2D.h"
#import "ContactHandler.h"


class ContactListenerClass : public b2ContactListener    {
public:
    ContactHandler* contactHandler;

       void BeginContact(b2Contact* contact);

};

ContactListenerClass.mm：

#import "ContactListenerClass.h"
#import "HelloWorldLayer.h"


void ContactListenerClass:: BeginContact(b2Contact *contact)
{


b2Fixture       *fixtureA = contact->GetFixtureA();
b2Fixture       *fixtureB = contact->GetFixtureB();
b2Body          *fixtureABody = fixtureA->GetBody();
b2Body          *fixtureBBody = fixtureB->GetBody();

CCPhysicsSprite* physicsSprite = (CCPhysicsSprite*)fixtureABody->GetUserData();
CCPhysicsSprite* physicsSprite2 = (CCPhysicsSprite*)fixtureBBody->GetUserData();

[contactHandler spritesHadContact:physicsSprite otherSprite:physicsSprite2];

}

已更新

ContactHandler类中的spritesHadContact方法不会将CCLOG打印到控制台。我尝试了一个CCLOG来查看正在进行的联系，但该方法无法识别任何联系人。

创建处理联系人的类的问题

0 个答案: