如何将自定义NSObject类保存到文件？

Question

我试过了：

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary];

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

但无论出于何种原因，它都因此错误而崩溃：

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'

我如何将NSObject子类保存到文件中？

Answer 1

如果您希望encodeWithCoder:工作，则需要在JEntry课程中实施 NSArchiver。您可能也需要initWithCoder:，以便以后可以反序列化。

阅读Archives and Serializations Programming Guide开始使用。