錯誤的類目標C

我有一個父類和一個子類。 GameObjectBase（父）GameObjectPlayer（子）。當我重寫Child類中的方法並調用它時使用錯誤的類目標C

[myPlayerClass showNextFrame]

它調用父類。原來在調試器中，我看到myPlayerClass確實是類類型的GameObjectBase（這是父類）怎麼回事？

GameObjectBase.h

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

@class GameLayer; 

@interface GameObjectBase : NSObject 
{ 
/* CCSprite *gameObjectSprite; // Sprite representing this game object 
    GameLayer *parentGameLayer; */ // Reference of the game layer this object 
    // belongs to 
} 
@property (nonatomic, assign) CCSprite *gameObjectSprite; 
@property (nonatomic, assign) GameLayer *parentGameLayer; 

// Class method. Autorelease 
+ (id) initWithGameLayer:(GameLayer *) gamelayer 
      imageFileName:(NSString *) fileName; 


// "Virtual methods" that the derived class should implement. 
// If not implemented, this method will be called and Assert game 
- (void) update: (ccTime) dt; 
- (void) showNextFrame; 

@end

GameObjectPlayer.h

#import <Foundation/Foundation.h> 
#import "GameObjectBase.h" 
@interface GameObjectPlayer : GameObjectBase 
{ 
    int direction; 
} 

@property (nonatomic) int direction; 
@end

GameLayer.h

#import "cocos2d.h" 
#import "GameObjectPlayer.h" 

@interface GameLayer : CCLayer 
{ 

} 

// returns a CCScene that contains the GameLayer as the only child 
+(CCScene *) scene; 

@property (nonatomic, strong) GameObjectPlayer *player; 
@end

當我打電話的調試器是什麼類型的「臨時」檢查是在這個函數內GameLayer類，它給父類GameObjectBase而不是子類GameObjectPlayer

- (void) update:(ccTime) dt 
{ 
    GameObjectPlayer *temp = _player; 

    [temp showNextFrame]; 

}

來源

2012-10-30 Max Hui

你如何爲玩家設定價值？在上面的例子中無法看到代碼。由於temp =等同於玩家，我認爲問題出在您創建玩家的代碼上。 – iDev

你如何創建玩家對象？ – LearnCocos2D

您只是指定了值。請分配它&然後分配它。

希望它能解決您的問題。

來源

2012-10-30 04:58:33 iCreative

錯誤的類目標C

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