ios - Cocos2d : how to share player data between scenes

Question

我有一个派生自 CCNode 的 PlayerData 类，我想将它作为静态单例实例在游戏的各个场景之间共享。

我尝试了以下实现:

#import <Foundation/Foundation.h>
#import "cocos2d.h"
@interface PlayerData : CCNode {

}

@property (readwrite, nonatomic) int data;  
+(id) playerData;
+(PlayerData*) sharedPlayerData;

#import "PlayerData.h"
@implementation PlayerData
@synthesize data;
static PlayerData* instanceOfPlayerData;

+(id) playerData 
{
    if(instanceOfPlayerData==nil){
        return  [[self alloc] init];
    }else {
        return [self sharedPlayerData];
    }
}

+(PlayerData*) sharedPlayerData{
    NSAssert(instanceOfPlayerData != nil, @"PlayerData instance not yet initialized!");
    return instanceOfPlayerData;
}


-(id) init 
{
    if ((self = [super init]))
    {
        instanceOfPlayerData=self;
        data=0;
        }
    return self;
}
@end

分配它的正确位置在哪里？我想过将它添加到 AppDelegate 类并访问它，但我无法完全理解如何做。

我看到我可以从 sharedDirector 访问一个委托(delegate)值，但我认为这不是正确的值，除非我必须将它转换为我的 AppDelegate 类。有什么建议吗？

[[CCDirector sharedDirector] delegate];

这是来自模板的 AppDelegate 类:

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

@interface AppController : NSObject <UIApplicationDelegate, CCDirectorDelegate>
{
    UIWindow *window_;
    UINavigationController *navController_;

    CCDirectorIOS   *__unsafe_unretained director_;                         // weak ref
}

@property (nonatomic) UIWindow *window;
@property (readonly) UINavigationController *navController;
@property (unsafe_unretained, readonly) CCDirectorIOS *director;

@end

PS:我正在使用启用了 ARC 的 Cocos2d v2.x

Answer 1

这是我在游戏中使用的很棒的单例教程，效果很好:http://getsetgames.com/2009/08/30/the-objective-c-singleton/