iOS self-defined object saved to local file

I saved the chat log locally and used my own defined object. The data is transferred to the database format and stored locally. When the data format is transferred to the error. It's time to archive your own definition objects to the data format.

Methods such as the following:

First, declarations <NSCoding> agreements in. h Files

Ii. implementing Encodewithcoder and Intiwithcoder methods in. m files

After archiving, the object is stored in a dictionary or array and converted into data format. and store it locally.

about how to turn a dictionary into data format I also have an article:

Address: http://blog.csdn.net/miaocuilin/article/details/40210281.

iOS self-defined object saved to local file