如何保存不是属性列表对象的Objective-C对象，或者有更好的方法比属性列表更好？

I'm writing a Cookbook application, and I've not been able to find anything on how to save the data of a class I've created (the Recipe class). The only way I've seen would be to possibly save the contents of this class as a whole without individually saving every element of the class for each object by making this method for my Recipe class:I'm writing a Cookbook application, and I've no