0

我有一个继承自CCSprite被调用的类GameObject。我还有一个ActionDispatcher继承自NSObject.

工作是在被询问时ActionDispatcher sharedActionDispatcher's返回 a CCActionInterval，并且执行此操作的方法需要对询问对象的引用，该对象是类型GameObject（或其子类）。但是为了GameObject能够要求这个，它需要参考ActionDispatcher。所以我在标题中有一个#import "GameObject.h"，在ActionDispatcher标题#import "ActionDispatcher"中有一个GameObject。

我收到一个错误：Expected ')' before 'GameObject'在ActionManager引用 a 的方法中GameObject。

编辑：添加评论以显示我根据下面接受的答案修复此问题的位置。

//The GameObject interface

#import "cocos2d.h"
#import "ActionDispatcher.h"

@interface GameObject : CCSprite {
    CGPoint homeLocation;
}

@property (readwrite) CGPoint homeLocation;

- (void)updateStateWithDeltaTime:(ccTime)deltaTime 
        andListOfGameObjects:(CCArray*)listOfGameObjects;

@end

//The GameObject implementation

#import "GameObject.h"

@implementation GameObject

@synthesize homeLocation;

- (void)updateStateWithDeltaTime:(ccTime)deltaTime 
        andListOfGameObjects:(CCArray *)listOfGameObjects 
{
    //CCLOG(@"updateStateWithDeltaTime method should be overriden");
}

@end

//The ActionDispatcher interface

#import "cocos2d.h"
#import "CCRotateAround.h"
#import "Constants.h"
#import "GameObject.h" // Answer: Remove this line

// Add this here: @class GameObject;

@interface ActionDispatcher : NSObject {

}

+ (ActionDispatcher *)sharedActionDispatcher;

- (id)actionWithType:(ActionType)actionType 
          withObject:(GameObject *)gameObject 
        withDuration:(float)duration;

@end

//The ActionDispatcher implementation

#import "ActionDispatcher.h"
// and add this here: #import "GameObject.h"

@implementation ActionDispatcher

static ActionDispatcher* _sharedActionDispatcher = nil;

+ (ActionDispatcher*)sharedActionDispatcher 
{
    @synchronized([ActionDispatcher class])                             
    {
        if(!_sharedActionDispatcher)                                    
            [[self alloc] init]; 
        return _sharedActionDispatcher;                                 
    }
    return nil; 
}

+ (id)alloc 
{
    @synchronized ([ActionDispatcher class])                            
    {
        NSAssert(_sharedActionDispatcher == nil,
                 @"Attempted to allocated a second instance of the ActionManager singleton");                                          
        _sharedActionDispatcher = [super alloc];
        return _sharedActionDispatcher;                                 
    }
    return nil;  
}

- (id)actionWithType:(ActionType)actionType 
          withObject:(GameObject *)gameObject 
        withDuration:(float)duration
{
    CGSize screenSize = [[CCDirector sharedDirector] winSize];

    id action = nil;

    switch (actionType) {
        case kActionDiveBomb:
            CCLOG(@"ActionManager returning action of type: dive bomb");
            CGPoint controlPoint1 = ccp(gameObject.position.x, gameObject.position.y*0.5f);
            CGPoint controlPoint2 = ccp(screenSize.width*0.5f, gameObject.position.y*0.5f);
            CGPoint destination = ccp(screenSize.width*0.5f, -gameObject.contentSize.height*0.5f);
            ccBezierConfig diveBombBezier;
            diveBombBezier.controlPoint_1 = controlPoint1;
            diveBombBezier.controlPoint_2 = controlPoint2;
            diveBombBezier.endPosition = destination;
            id diveAction = [CCBezierTo actionWithDuration:duration bezier:diveBombBezier];
            id returnToTopAction = [CCMoveTo actionWithDuration:0.0f position:ccp(gameObject.homeLocation.x, screenSize.height+gameObject.contentSize.height/2)];
            id fallInAction = [CCMoveTo actionWithDuration:duration*0.2 position:gameObject.homeLocation];
            action = [CCSequence actions:diveAction, returnToTopAction, fallInAction, nil];
            break;
        case kActionLoop:
            CCLOG(@"ActionManager returning action of type: loop");
            CGPoint centerPoint = ccp(screenSize.width/2, screenSize.height/2);
            float span = 360.0;
            action = [CCRotateAround actionWithDuration:duration centerPoint:centerPoint spanAngle:span];
            break;
        case kActionSpin:
            CCLOG(@"ActionManager returning action of type: spin");
            action = [CCRotateBy actionWithDuration:duration angle:360.0f];
            break;
        case kActionGoHome:
            CCLOG(@"ActionManager returning action of type: go home");
            action = [CCMoveTo actionWithDuration:0.0f position:[gameObject homeLocation]];
            break;
        case kActionFallIn:
            CCLOG(@"ActionManager returning action of type: fall in");
            action = [CCMoveTo actionWithDuration:duration position:[gameObject homeLocation]];
            break;
        case kActionIdle:
            CCLOG(@"ActionManager returning action of type: idle");
            action = [CCDelayTime actionWithDuration:duration];
            break;
        default:
            CCLOG(@"ActionManager returning action of type: no valid action");
            break;
    }

    return action;
}

@end
4

3 回答 3

2

只需@class在 ActionDispatcher.h 上方的@interface. 这是在实现中导入的类的前向声明。

@class GameObject;

于 2011-09-14T01:31:27.353 回答
0

可能的。尝试插入

@class GameObject

在 ActionManager.m 中导入后的前向声明？这应该打破循环。

于 2011-09-14T01:30:26.763 回答
-1

这不是问题。#import 指令自动处理已包含文件的包含。讨论在这里。要检查它是否注释掉所有其他导入，请从 NSObject 子类化您的 GameObject，它将编译而不会出错。该错误告诉您包含的文件之一有问题。有时它可能是 @end 关键字后面的头文件中的错误符号，这使得编译器在错误的地方抱怨。

于 2011-09-14T01:47:55.107 回答