类数据类型的持久化数据

Question

我有一个类实例，它基本上是来自我自己的另一个类的可变对象数组。我需要将其存储在持久数据中，但我遇到了问题，我尝试使用方法进行归档

-(void)archiveFavorites {
    Singleton *singleton = [Singleton sharedSingleton];
    NSLog(@"archiving");
    GameDatabase *favoritesToArchive = singleton.favorites;
    [NSKeyedArchiver archiveRootObject:favoritesToArchive toFile:[self archivePath]];
}

-(NSString *)archivePath {
    NSString *docDir = 
    [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    return [docDir stringByAppendingPathComponent: @"Favorites.dat"];
}

在我的视图控制器中。然后我打电话给

[viewController archiveFavorites];

在我的应用委托中“应用位置确实进入了后台”

基本上，我正在尝试将我自己的类 (GameDatabase) 的实例存储在存档中。当它归档时，我被抛出异常：

编辑：好的，这就是我现在要在我的两个类中实现的内容： 游戏数据库.m

- (void)encodeWithCoder:(NSCoder *)encoder{
    [encoder encodeObject:games forKey:@"Games"];
}

- (id)initWithCoder:(NSCoder *)decoder{
    if(self = [super init])
    {
        games = [decoder decodeObjectForKey:@"Games"];
    }
    return self;
}

GameRecord.m

- (id)initWithCoder:(NSCoder *)decoder {

    if (self = [super init]) {
        self.name = [decoder decodeObjectForKey:@"Name"];
        self.gameRules = [decoder decodeObjectForKey:@"GameRules"];
        self.players = [decoder decodeIntForKey:@"Players"];
        self.gameType = [decoder decodeIntForKey:@"GameType"];
        self.drinkType = [decoder decodeIntForKey:@"DrinkType"];
    }
    return self;

}

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

    [encoder encodeObject:self.name forKey:@"Name"];
    [encoder encodeObject:self.gameRules forKey:@"GameRules"];
    [encoder encodeInt:self.players forKey:@"Players"];
    [encoder encodeInt:self.gameType forKey:@"GameType"];
    [encoder encodeInt:self.drinkType forKey:@"DrinkType"];

}

Answer 1

您走在正确的道路上，但您需要让您的 GameDatabase 类实现 NSCoding 协议。只需添加两个方法described in the docs。