我如何保存一个自定义的NSObject类到文件？

Question

我想：

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary]; 

    BOOL success = [data writeToFile:entryPath atomically:YES]; 

但无论出于何种原因，坠毁与此错误：

2012-03-24 20:06:13.550 Journal[1348:707] -[JEntry encodeWithCoder:]: unrecognized selector sent to instance 0x25d1a0 
2012-03-24 20:06:13.553 Journal[1348:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[JEntry encodeWithCoder:]: unrecognized selector sent to instance 0x25d1a0' 

不然怎么我的NSObject的子类，保存到一个文件？

Answer 1

如果您想让NSArchiver工作，您需要工具encodeWithCoder:在您的JEntry类中。您也可能需要initWithCoder:，以便稍后反序列化。

阅读Archives and Serializations Programming Guide开始。