我如何保存一個自定義的NSObject類到文件？

Question

我想：

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary]; 

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

但無論出於何種原因，墜毀與此錯誤：

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' 

不然怎麼我的NSObject的子類，保存到一個文件？

Answer 1

如果您想讓NSArchiver工作，您需要工具encodeWithCoder:在您的JEntry類中。您也可能需要initWithCoder:，以便稍後反序列化。

閱讀Archives and Serializations Programming Guide開始。