Question

编写iOS / objective-c / cocos2d应用程序。事情一直很好，直到这个障碍...我应该注意到它是Objective-C ++，即。 .mm文件，为iOS 5.0模拟器编译。

基本上，我只是尝试子类化接口。错误发生在@interface行：“无法找到GameObject的接口声明”

#import <Foundation/Foundation.h>
#import "CCSprite.h"
#import "cocos2d.h"
#import "Box2D.h"
#import "GameObject.h"

@interface AvalancheBlock : GameObject
{
}

@end

这是GameObject.h的代码：

#import <UIKit/UIKit.h>
#import "cocos2d.h"
#import "Box2D.h"
#import "b2Body.h"
#import "OhSnowGame.h"


@interface GameObject : CCNode {
@public
    b2Body *body;
    b2BodyDef *bodyDef;
    b2FixtureDef *fixtureDef;
    b2PolygonShape *polygonShape;
    b2CircleShape *circleShape;
    CCSprite *sprite;
    int typeTag;
    bool markedForDestruction;
}

@property (readwrite, assign) b2Body *body;
@property (nonatomic, assign) b2BodyDef *bodyDef;
@property (nonatomic, assign) b2FixtureDef *fixtureDef;
@property (nonatomic, assign) b2PolygonShape *polygonShape;
@property (nonatomic, assign) b2CircleShape *circleShape;
@property (nonatomic, retain) CCSprite *sprite;
@property (readwrite, assign) int typeTag;
@property (readwrite, assign) bool markedForDestruction;
@property (readonly) int type;

-(id) init;
-(void) initBox2D;
-(int) type;

@end

和GameObject.mm：

#import "GameObject.h"

@implementation GameObject

@synthesize body, bodyDef, fixtureDef, polygonShape, circleShape, sprite, type, typeTag, markedForDestruction;

-(id) init {
    if( (self=[super init]) ) {
        [self initBox2D];
        markedForDestruction = NO;
    }
    return self;
}

-(void) initBox2D {
    bodyDef = new b2BodyDef();
    fixtureDef = new b2FixtureDef();

    //Initial fixture settings
    fixtureDef->density = 1.0f;
    fixtureDef->friction = 0.5f;
    fixtureDef->restitution = 0.3f;

    bodyDef->userData = self;
}

-(int) type {
    return 0;
}

@end

如果正在包含正确的文件...那么为什么会出错？谢谢！

解决： 想出来......有一个循环引用，但我仍然需要参考。解决方案是从GameObject.h中删除#import“OhSnowGame.h”，而不是添加指令： @class OhSnowGame

每天都学习新东西。

第二次更新： 新问题，但非常相关。我有OhSnowGame.mm，其中包含一个“AvalancheGrid.h”。 AvalancheGrid.h包括AvalancheParams.h。在OhSnowGame中，我引用了AvalancheGrid和AvalancheParams。

编译器抛出链接器错误： “在OhSnowGame.o和AvalancheGrid.o中复制符号AvalancheParams”

但实际上似乎没有任何循环引用我。如果我用OhSnowGame.mm替换#import“AvalancheGrid.h” @class AvalancheGrid; （还有@class AvalancheParams.h;）然后它不允许我像我需要的那样引用那些对象的属性，即：

avParams.severity = 3; //nope
avParams->severity = 3; //nope
[avParams setSeverity:3]; //nope (with @property severity exposed and synthesized)

我不明白。如何避免链接器错误并仍然访问这些属性？

Objective-C“无法找到Object的接口声明”

0 个答案: