Question

我需要将OrderedDictionary保存到NSUserDefaults。

我阅读here以及许多其他帖子中的操作方法：

-(id)initWithCoder:(NSCoder *)decoder{
     if (self != nil){
         dictionary = [decoder decodeObjectForKey:@"dictionary"];
         array = [decoder decodeObjectForKey:@"array"];
     }
    return self;
}

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

然后我这样称呼它：

 OrderedDictionary *od = [OrderedDictionary dictionaryWithDictionary:[businessInfo objectForKey:@"allowedStates"]];
    NSData *archivedObject = [NSKeyedArchiver archivedDataWithRootObject:od];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:archivedObject forKey:@"allowedStates"];
    [defaults synchronize];

并将其解压缩如下：

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSData *archivedObject = [defaults objectForKey:@"allowedStates"];
    OrderedDictionary *countryStates = (OrderedDictionary *)[NSKeyedUnarchiver unarchiveObjectWithData:archivedObject];

我看到archivedObject不为空，但是countryStates为空，但是当我保存它时它不是空的。

怎么回事？

如何成功归档OrderedDictionary？

EDITED

正在调用initWithCoder方法，但不是encodeWithCoder

Answer 1

确保您的班级符合<NSCoding>协议1（因此您的班级定义为@interface OrderedDictionary <NSCoding>）
否则，框架不知道它应该调用encodeWithCoder:

Answer 2

请参考以下链接，可能会得到正确的解决方案。

encodeWithCoder is not called in derived class of the NSMutableDictionary

When does encodeWithCoder get called?

祝你好运!!!!

将自定义OrderedDictionary存储到NSUserDefaults

2 个答案: