cocos2d中的單例類。訪問變量

Question

我有一個訪問我的Singleton類屬性的問題。 我已經寫了這個代碼：Singleton.h -

#import <Foundation/Foundation.h> 

@interface Singleton : NSObject{ 
    int _wordNumber; 
} 
+ (Singleton *) sharedSingleron; 
@property (readwrite) int wordNumber; 
@end 

Singleton.m文件 -

#import "Singleton.h" 
@implementation Singleton 
@synthesize wordNumber = _wordNumber; 


static Singleton* _sharedSingleton = nil; 

+(Singleton *) sharedSingleron{ 
    @synchronized([Singleton class]) 
    { 
     if (!_sharedSingleton) 
      [[self alloc] init]; 

     return _sharedSingleton; 
    } 

    return nil; 
} 
+(id)alloc 
{ 
    @synchronized([Singleton class]) 
    { 
     NSAssert(_sharedSingleton == nil, @"Attempted to allocate a second instance of a singleton."); 
     _sharedSingleton = [super alloc]; 
     return _sharedSingleton; 
    } 

    return nil; 
} 

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

    } 

    return self; 
} 


@end 

在我的第一個場景我設置wordNumber並轉到另一個場景

[Singleton sharedSingleron].wordNumber = wordNum; 
[[CCDirector sharedDirector] replaceScene: [CCTransitionFlipAngular transitionWithDuration:0.3 scene:[WordsLayer node]]]; 

並在WordsLayer.m我試圖得到這個屬性

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

     int wordNum = [Singleton sharedSingleron].wordNumber; 

    } 
    return self; 
} 

但wordNum有錯誤的值。請幫助我找到一個錯誤。

Answer 1

也許嘗試：

+(Singleton *) sharedSingleron{ 
    @synchronized([Singleton class]) { 
    if (!_sharedSingleton) 
     _sharedSingleton = [[self alloc] init]; 

    return _sharedSingleton; 
    } 
    return nil; 
}