Question

我在objective-c中创建了一个类，我在另一个类中创建了一个实例，我的代码看起来像这样......

    #pragma mark - HelloWorldLayer

    @interface HelloWorldLayer()
    -(void) initPhysics;
    @end

    @implementation HelloWorldLayer

    -(id) init
    {
        if( (self=[super init])) {

            // init physics
            [self initPhysics];

            //THE CLASS I'M HAVING TROUBLE WITH
            id player;

            player = [Blob new];

            //SAYS SET NODES CAN'T BE FOUND
            [player setNodes];

            [self scheduleUpdate];
        }
        return self;
    }

    -(void) initPhysics
    {
        //BLAHBLAHBLAH
    }

    -(void) draw
    {
        //BLAHBLAHBLAH
    }

    -(void) update: (ccTime) dt
    {
        //BLAHBLAHBLAH
    }

    - (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    {
        //BLAHBLAHBLAH

    }

    @end

    #pragma mark - HelloWorldLayer

    @interface Blob()
    -(void) setNodes;
    @end

    @implementation Blob

   -(void) setNodes;
    {
        b2BodyDef bodyDef;
        b2Body *body;

        bodyDef.type = b2_dynamicBody;

        bodyDef.position.Set(100/PTM_RATIO,100/PTM_RATIO);

        body = world->CreateBody(&bodyDef);

        // Define another box shape for our dynamic body.
        b2CircleShape circle;
        circle.m_radius = 32/PTM_RATIO;

        // Define the dynamic body fixture.
        b2FixtureDef fixtureDef;
        fixtureDef.shape = &circle; 
        fixtureDef.density = 0.5f;
        fixtureDef.friction = 0.5f;
        fixtureDef.restitution = 0.0f;
        body->CreateFixture(&fixtureDef);

    }

    @end

我正在使用cocos2d和box2d为iphone编写游戏，我拿出了大部分批量代码。但是我遇到了blob类的问题。我创建一个名为player的实例，并尝试调用函数“setNodes”而我的问题是每次编译它都会给我一个警告，即setNodes无法找到...我觉得我做错了，因为我知道它在那里.. Objective-c是skrewwy我是一个C ++人，谢谢你。）

Answer 1

setNodes应该在行之前声明：

[player setNodes];

您可能应该在.h文件中声明您的类并导入它，就像在C ++中一样。

或者至少，在实施HelloWorldLayer

之前放置Blob的声明

@interface Blob()
    -(void) setNodes;
@end

@implementation HelloWorldLayer
// ...

在课堂上找不到功能

1 个答案: