iphone - 将 NSObject 转换为 NSData

Question

我在将 NSObject 转换为 NSData 时遇到问题。我有一个继承 NSObject 的类。

当我尝试将该特定类的对象转换为 NSData 时，如下所示:

NSData *dataOnObject = [NSKeyedArchiver archivedDataWithRootObject:classObject];

但它给出了异常，指出 -[classObjectencodeWithCoder:]: 无法识别的选择器发送到实例..

我还将对象添加到新创建的数组中，如下所示

NSMutableArray *wrapperedData = [NSMutableArray arrayWithObject: classObject];
NSData *dataOnObject = [NSKeyedArchiver archivedDataWithRootObject:value];

但是，它仍然给出了异常。

所以我需要从对象classObject中提取字节。

任何帮助将不胜感激......

等待您的回复...

Answer 1

您必须实现自己的对象，例如:

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeInt:self.age forKey:@"age"];
    [aCoder encodeObject:self.email forKey:@"email"];
    [aCoder encodeObject:self.password forKey:@"password"];
}
BOOL success = [NSKeyedArchiver archiveRootObject:person toFile:archiveFilePath];

和:

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super init]) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.age = [aDecoder decodeIntForKey:@"age"];
        self.email = [aDecoder decodeObjectForKey:@"email"];
        self.password = [aDecoder decodeObjectForKey:@"password"];
    }
    return self;
}
Person *unarchivePerson = [NSKeyedUnarchiver unarchiveObjectWithFile:archiveFilePath];