對象內的對象的NSKeyedArchiver archiveRootObject不起作用！

Question

我有一個級別類，巫包含一些屬性另一類LevelPoints，我如何通過使用

[projectDictionary setObject:level forKey:@"testlevel"]; 
[NSKeyedArchiver archiveRootObject:projectDictionary toFile:@"somewhere"]; 

我無法用值了[NSKeyedUnarchiver unarchiveObjectWithFile的_levelPoints變量歸檔級別的實例： DATAPATH];

任何想法？

#import <Foundation/Foundation.h> 

@interface Level : NSObject <NSCoding> { 
    int _levelNum; 
    float _spawnRate; 
    NSString *_bgImageName; 
    LevelPoints *_levelPoints; 
} 

@property (nonatomic, assign) int levelNum; 
@property (nonatomic, assign) float spawnRate; 
@property (nonatomic, copy) NSString *bgImageName; 
@property (nonatomic, retain) LevelPoints *levelPoints; 

- (id)initWithLevelNum:(int)levelNum spawnRate:(float)spawnRate bgImageName:(NSString *)bgImageName; 

- (id)initWithCoder:(NSCoder *)aDecoder; 
- (void)encodeWithCoder:(NSCoder *)aCoder; 

@end 


#import <Foundation/Foundation.h> 


@interface LevelPoints : NSObject <NSCoding> { 
    int _score; 
    int _outflows; 
    int _mistakes; 
} 
@property (nonatomic, assign) int score; 
@property (nonatomic, assign) int outflows; 
@property (nonatomic, assign) int mistakes; 

- (id)initWithCoder:(NSCoder *)aDecoder; 
- (void)encodeWithCoder:(NSCoder *)aCoder; 
@end 

Answer 1

你的意思是這樣的：

- (id)initWithCoder:(NSCoder *)aDecoder 
{ 
    ... 
    self.levelPoints = [aDecoder decodeObjectForKey: @"myKey"]; 
    ... 
} 

- (void)encodeWithCoder:(NSCoder *)aCoder 
{ 
    ... 
    [aCoder encodeObject:self.levelPoints forKey: @"myKey"]; 
    ... 
} 

編輯：這些實現應該進入級賽事。