将NSObject转换为NSData

问题描述

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

I am having an issue in converting a NSObject into NSData. I have a class which inherits NSObject.

当我试图将该特定类的对象转换为 NSData 如下：

When i tried to convert the object of that particular class into NSData as follows :

NSData *dataOnObject = [NSKeyedArchiver archivedDataWithRootObject:classObject];

但是它给出了异常声明 - [classObject encodeWithCoder：]：发送到实例的无法识别的选择器..

but it gives out exception stating that -[classObject encodeWithCoder:]: unrecognized selector sent to instance ..

我还将对象添加到新创建的数组中

I have also added the object to a newly created array as

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

但是，它仍然给出例外。

But still , its giving out exception.

所以我需要从对象 classObject 中提取字节。

So I need to extract the bytes from the object classObject.

我们非常感谢任何帮助...

Any help would be greatly appreciated ...

等待您的回复......

awaiting for your reply ...

推荐答案

您必须为自己的对象实现，例如：

You must implement for your own object such as:

- (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];

这篇关于将NSObject转换为NSData的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！