解碼器的NSString墜毀

我有saveing得分類：解碼器的NSString墜毀

#import "cocos2d.h" 

@interface ScoreData : NSObject<NSCoding> { 

    NSString *playerName; 
    NSDate *playDate; 
} 
-(NSString*)description; 
@property (nonatomic, retain) NSString *playerName; 
@property (nonatomic, retain) NSDate *playDate; 
@end 


#import "GameData.h" 

@implementation ScoreData 
@synthesize playerName; 
@synthesize playDate; 

#define kPlayerNameKey  @"PlayerName" 
#define kPlayDateKey  @"playDate" 

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

    } 

    return self; 
} 

- (void) encodeWithCoder:(NSCoder *)encoder 
{ 
    [encoder encodeObject:self.playerName 
        forKey:kPlayerNameKey]; 
    [encoder encodeObject:self.playDate 
        forKey:kPlayDateKey]; 
} 

- (id)initWithCoder:(NSCoder *)decoder 
{ 
    ScoreData *highScoreData = [[ScoreData alloc] init]; 
    highScoreData.playerName = [[decoder decodeObjectForKey:kPlayerNameKey] string]; 
    highScoreData.playDate = [[decoder decodeObjectForKey:kPlayDateKey] date]; 

    return highScoreData; 
} 

@end

在我GameLayer我打電話保存得分是這樣的：

@interface GameLayer : CCLayer 
{ 
    ScoreData *scoreData; 
} 

-(void)gameOver 
{ 
    scoreData.playerName = @"test"; 
    scoreData.playDate = [NSDate new]; 

    [[GameDataManager sharedGameDataManager] updateLocalScore:scoreData]; 
}

和代碼來保存數據：

-(void)updateLocalHighScore:(ScoreData *)scoreData 
{ 
    [highScoreDataArray addObject:scoreData]; 

    NSMutableDictionary *dic = [[NSMutableDictionary alloc] init]; 
    [dic setObject:self.highScoreDataArray 
      forKey:@"LocalHighScoreData"]; 

    [self writeApplicationData:dic bwriteFileName:@"teste.plist"]; 
} 

-(BOOL) writeApplicationData:(NSDictionary *)data 
       bwriteFileName:(NSString *)fileName 
{ 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    if (!documentsDirectory) { 
     NSLog(@"Documents directory not found!"); 
     return NO; 
    } 

    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName]; 

    NSMutableArray *a = [[NSMutableArray alloc] init]; 
    a = [data objectForKey:@"ScoreData"]; 

    NSMutableData *_data = [[NSMutableData alloc] init]; 
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:_data];   
    [archiver encodeObject:data forKey:@"GameData"]; 
    [archiver finishEncoding]; 
    [_data writeToFile:appFile atomically:YES]; 
    [archiver release]; 
    [data release]; 

    return YES; 
}

，且數據正確保存...

然後我試圖從plist中讀取數據：

-(BOOL) readApplicationData:(NSString *)fileName 
{ 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName]; 
    NSData *myData = [[[NSData alloc] initWithContentsOfFile:appFile] autorelease]; 

    if (myData == nil) { 

     return NO; 
    } 

    NSKeyedUnarchiver *un = [[NSKeyedUnarchiver alloc] initForReadingWithData:myData]; 
    NSMutableDictionary *dic = [un decodeObjectForKey:@"GameData"]; 

    self.highScoreDataArray = [dic objectForKey:@"ScoreData"]; 

    [un finishDecoding]; 
    [un release]; 

    return YES; 
}

，但應用程序崩潰的位置：

- (id)initWithCoder:(NSCoder *)decoder 
{ 
    ScoreData *highScoreData = [[ScoreData alloc] init]; 
    highScoreData.playerName = [[decoder decodeObjectForKey:kPlayerNameKey] string]; 

    return highScoreData; 
}

說： [4011：207] - [NSCFString字符串]：無法識別的選擇發送到實例0x544dd10 [4011：207] *終止應用程序由於未捕獲的異常 'NSInvalidArgumentException'，原因： ' - [NSCFString字符串]：無法識別的選擇發送到實例0x544dd10'

任何人都可以幫助我離開這裏。謝謝^ _^

來源

2011-03-18 supersurabbit

那麼，錯誤消息說明了一切。您正在致電NSString上的-string方法，並且由於此方法不存在，您的應用程序將崩潰。而且，這裏的消息-string和-date完全沒有必要。只要刪除它們。

您的代碼中存在更多問題：例如：您通常不應在-initWithCoder:中分配新對象。如果你這樣做，你有內存泄漏。該方法應該看起來像這樣：

- (id)initWithCoder:(NSCoder *)decoder 
{ 
    self = [super init]; 
    if (self != nil) { 
     self.playerName = [decoder decodeObjectForKey:kPlayerNameKey]; 
     self.playDate = [decoder decodeObjectForKey:kPlayDateKey]; 
    } 
    return self; 
}

我還沒有檢查剩餘的代碼，所以它很可能存在更多的錯誤。

來源

2011-04-09 11:14:09

解碼器的NSString墜毀

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