Ios NSObject没有'；t编码后使用NSUserDefaults保存

)

我的

NSObject

在使用

NSUserDefaults

保存之前未正确编码

NSObject

这是我的代码：

NSUserDefaults *userDefault=[NSUserDefaults standardUserDefaults];

NSLog(@"Favorite artists before encode: %@", self.model.favoriteArtists);

NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:self.model];
                        [userDefault setObject:myEncodedObject forKey:[NSString stringWithFormat:@"Favorites"]];

[userDefault synchronize];


NSData *myDecodedObject = [userDefault objectForKey: [NSString stringWithFormat:@"Favorites"]];

self.model=[NSKeyedUnarchiver unarchiveObjectWithData: myDecodedObject];

NSLog(@"Favorite artists after encode: %@",self.model.favoriteArtists); 

编码前控制台中的输出如下：

Favorite artists before encode: (
    "<SBQArtistModel: 0x15671d30>"
)

为什么什么也救不了

我真的被这件事缠住了。代码似乎是正确的，我不明白发生了什么

谢谢

编辑

我正在我的

NSObject

类中实现

NSCoding

协议，并在

NSObject

上实现

initWithCoder:

和

encodeWithCoder:

方法

h中的代码：

@interface SBQAllArtistsModel : NSObject <NSCoding>

对数组进行编码（例如

self.artists

）时，数组中的每个对象也会进行编码。因此，他们还需要遵守

，并实施适当的方法来归档和恢复其内容

因为您从未存档但为空的数组中获取了有效对象，这表明您的对象存档和恢复正常，但数组的内容没有正确实现协议，因此它们的值丢失。因此，当您运行谓词时，不会得到任何结果

还原对象后，您可以通过调试self.artists的内容来验证这一点。

我得到了解决方案

我有两个NSObject，一个保存我所有的艺术家，每个艺术家一个。因此，在保存艺术家信息的NSObject中，我有一个BOOL值，如果我选择艺术家作为收藏夹，我会在其中存储该值。我没有将这个BOOL值添加到他的NSCoding protocols方法中，因为BOOL不是一个对象，我不能，所以我创建了一个NSNumber来存储收藏夹的值，在我将它添加到NSCoding protocols方法中后，效果很好

我的艺术家对象中的代码

.h

@interface SBQArtistModel : NSObject <NSCoding>

@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *bio;
@property (strong, nonatomic) NSString *location;
@property (strong, nonatomic) NSString *linkSoundcloud;
@property (strong, nonatomic) NSString *linkFacebook;
@property (strong, nonatomic) NSString *thumbnail;
@property (strong, nonatomic) NSString *image;
@property (strong, nonatomic) NSNumber *numberFavorite;
@property (nonatomic) BOOL Favorite;

---

谢谢，我希望你解释得很好；）

什么类型是self.model.favoriteArtists？你能用与我的问题相关的代码展示你的目标实现吗谢谢各位。“favoriteArtists”返回一个“NSArray”您是对的！我没有编码布尔值。使用NSNumber对象作为属性保存此值并对其进行编码后，现在开始工作。

- (void)encodeWithCoder:(NSCoder *)encoder
{

    //Encode properties, other class variables, etc
    [encoder encodeObject:self.artists forKey:@"artists"];
    [encoder encodeObject:self.items forKey:@"items"];
    [encoder encodeObject:self.arrays forKey:@"arrays"];
    [encoder encodeObject:self.artistFav forKey:@"artistFav"];

}
- (id)initWithCoder:(NSCoder *)decoder
{
    self = [super init];
    if( self != nil )
    {
        self.artists = [decoder decodeObjectForKey:@"artists"];
        self.items = [decoder decodeObjectForKey:@"items"];
        self.arrays = [decoder decodeObjectForKey:@"arrays"];
        self.artistFav = [decoder decodeObjectForKey:@"artistFav"];

    }
    return self;
}

-(NSArray *)favoriteArtists{
    NSPredicate *predicate = [NSPredicate predicateWithFormat: @"Favorite == YES"];
    return [self.artists filteredArrayUsingPredicate: predicate];
}

@interface SBQArtistModel : NSObject <NSCoding>

@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *bio;
@property (strong, nonatomic) NSString *location;
@property (strong, nonatomic) NSString *linkSoundcloud;
@property (strong, nonatomic) NSString *linkFacebook;
@property (strong, nonatomic) NSString *thumbnail;
@property (strong, nonatomic) NSString *image;
@property (strong, nonatomic) NSNumber *numberFavorite;
@property (nonatomic) BOOL Favorite;

- (void)encodeWithCoder:(NSCoder *)encoder
{


    [encoder encodeObject:self.name forKey:@"name"];
    [encoder encodeObject:self.bio forKey:@"bio"];
    [encoder encodeObject:self.location forKey:@"location"];
    [encoder encodeObject:self.linkSoundcloud forKey:@"linkSoundcloud"];
    [encoder encodeObject:self.linkFacebook forKey:@"linkFacebook"];
    [encoder encodeObject:self.thumbnail forKey:@"thumbnail"];
    [encoder encodeObject:self.image forKey:@"image"];
    [encoder encodeObject:self.numberFavorite forKey:@"numberFavorite"];

}

- (id)initWithCoder:(NSCoder *)decoder
{
    self = [super init];
    if( self != nil )
    {
        self.name = [decoder decodeObjectForKey:@"name"];
        self.bio = [decoder decodeObjectForKey:@"bio"];
        self.location = [decoder decodeObjectForKey:@"location"];
        self.linkSoundcloud = [decoder decodeObjectForKey:@"linkSoundcloud"];
        self.linkFacebook = [decoder decodeObjectForKey:@"linkFacebook"];
        self.thumbnail = [decoder decodeObjectForKey:@"thumbnail"];
        self.image = [decoder decodeObjectForKey:@"image"];
        self.numberFavorite = [decoder decodeObjectForKey:@"numberFavorite"];

    }
    return self;
}